Physical Science - 2nd Semester Final - Review

The electric field lines around a negatively charged particle a. cross negatively charged particle field lines. b. always point outward. c. always point inward. d. cross positively charged particle field lines.

c. always point inward.

If the net force on an object is zero then the object has a. unbalanced forces. b. reaction forces. c. balanced forces. d. action forces.

c. balanced forces

Electric field lines indicate a. neither direction nor strength. b. relative strength only. c. both direction and relative strength. d. direction only.

c. both direction and relative strength

Which of the following is not a rock type? a. sedimentary b. igneous c. cubic d. metamorphic

c. cubic

Which of the following is not a rock? a. marble b. granite c. diamond d. shale

c. diamond

The gravitational force between two objects depends on masses of objects and a. accelerations of objects. b. speeds of objects. c. distance between objects. d. sizes of objects.

c. distance between objects

A crack in the Earth created when rocks on either side of a break move a. valley b. rift c. fault d. slip zone

c. fault

The friction between the air and the surface of a moving object is a. molecular friction. b. rolling friction. c. fluid friction. d. static friction.

c. fluid friction

When the velocity of an object changes, it is acted upon by a(n) a. inertia. b. deceleration. c. force. d. momentum.

c. force

Which of the following is characteristic of nuclear energy? a. releases air pollutants b. widespread in the United States c. produces radioactive waste d. all of these

c. produces radioactive waste

A geologic feature of divergent plate boundaries in oceanic crust is the formation of a. trenches. b. U-shaped valleys. c. rift valleys. d. fossils.

c. rift valleys.

Morse code was developed for a. sending ship-to-ship communications. b. sending ship-to-shore communications. c. sending information by telegraph. d. sending information by telephone.

c. sending information by telegraph.

Which of the following speeds is the most accurate? a. 100 miles per day b. 100 miles per minute c. 100 miles per hour d. 100 miles per second

d. 100 miles per second

The solar system is approximately _______ years old. a. 280 million b. 6000 c. 15 billion d. 4.6 billion

d. 4.6 billion

Which statement about weight is INCORRECT? a. An object weighs more on the moon than it weighs on Earth. b. The weight of an object depends on gravity. c. A change in an object's location can change the object's weight. d. An object's weight is directly proportional to its mass.

a. An object weighs more on the moon than it weighs on Earth

When an object changes position relative to a reference point, the object is a. in motion. b. stationary. c. moving at a constant velocity. d. moving at a constant speed.

a. in motion

A wedge is a modified a. inclined plane. b. wheel and axle. c. lever. d. pulley.

a. inclined plane.

There is a potential difference of 6 V across a resistor with 0.25 A of current in it. The resistance of the resistor is a. 48 Ω. b. 24 Ω. c. 0.021Ω. d. 12 Ω.

b. 24 Ω

What happens to the resistance of a superconductor when its temperature drops below the critical temperature? a. Resistance increases. b. Resistance drops to zero. c. Resistance doubles. d. Resistance is reduced by one-half.

b. Resistance drops to zero

By the year 2009, all television signals will be broadcast a. using radio waves. b. digitally. c. electromagnetically. d. visually.

b. digitally.

Displacement must always indicate a. time. b. direction. c. velocity. d. speed.

b. direction

Whenever a force is exerted another force occurs that is ______ in size and ______ in direction. a. smaller, opposite b. equal, opposite c. equal, same d. smaller, same

b. equal, opposite

In order to increase a car's speed, the force pushing it forward must be a. equal to the force of friction. b. greater than the force of friction. c. rolling friction. d. a negative force.

b. greater than the force of friction

All the physical components of a computer are called a. floppy drive. b. hardware. c. hard drive. d. software.

b. hardware.

An object experiencing balanced forces a. is speeding up. b. has a net force of zero. c. is slowing down. d. stops moving.

b. has a net force of zero

The energy transferred between objects with different temperatures is a. potential. b. heat. c. temperature. d. absolute zero.

b. heat

Heat always moves from an object of ______ temperature to an object of ______ temperature. a. lower, higher b. higher, lower c. moderate, high d. zero, high

b. higher, lower

Temperature is a measure of the average ______ energy of an object's particles. a. potential b. kinetic c. mechanical d. light

b. kinetic

If you divide momentum by velocity, the result is the value of object's a. speed. b. mass. c. direction. d. energy.

b. mass

Nonrenewable resources are a. very expensive resources. b. resources that are used faster than they can be replaced. c. energy from the sun. d. rare earth elements.

b. resources that are used faster than they can be replaced

Net force is a. the force acting in the opposite direction of an object's movement. b. the combination of all forces acting on an object. c. the force of gravity pulling an object down. d. the force acting in the same direction as an object's movement.

b. the combination of all forces acting on an object

What is the unbalanced force that slows down a ball rolling across the floor? a. the force of inertia b. the force of friction c. the force of gravity d. the force of momentum

b. the force of friction

Astronomers believe __________ was originally a part of Earth. a. the sun b. the moon c. Mars d. Jupiter

b. the moon

All planets in the solar system revolve around a. Jupiter. b. the sun. c. Earth. d. Mars.

b. the sun.

The largest body in the solar system is a. Earth. b. the sun. c. the moon. d. Jupiter.

b. the sun.

There is a repulsive force between two charged objects when a. their charges are of unlike sign. b. their charges are of like sign. c. they have the same number of protons. d. they have the same number of electrons.

b. their charges are of like sign

An ecosystem is balanced when a. energy does not enter or leave the ecosystem. b. there are enough resources for every living thing. c. there are an equal number of plants and animals. d. there is plenty of rain.

b. there are enough resources for every living thing.

Levers are divided into ___________ classes based on the location of the fulcrum and of the input and output forces. a. four b. three c. five d. two

b. three

An example of constant acceleration is a. static friction. b. uniform circular motion. c. average speed. d. balanced forces.

b. uniform circular motion.

The transfer of energy to a body by the application of a force that causes the body to move in the direction of the force is called a. distance. b. work. c. mechanical advantage. d. power.

b. work.

Which of the following is not a fossil fuel? a. natural gas b. coal c. oil d. hydrogen

d. hydrogen

A material that is a poor conductor of energy a. specific heat b. radiator c. conductor d. insulator

d. insulator

Which of the following substances is the best conductor of transferring energy as heat? a. water b. rubber c. carbon dioxide gas d. iron

d. iron

Increasing which of these conditions results in more gravitational force between two objects? a. acceleration b. distance c. surface area d. mass

d. mass

Which of the following valley shapes would glaciers produce? a. A b. B c. C d. D

?

Which of the following temperatures is impossible? a. -20 K b. -85 F c. -50 C d. None of these

a. -20 K

What is the speed of an object at rest? a. 0 km/h b. 1 km/h c. 15 km/h d. This cannot be determined without further information.

a. 0 km/h

What is the mechanical advantage of a single, fixed pulley? a. 1 b. 0.5 c. 4 d. 2

a. 1

An electric toaster has a power rating of 1000 W at 100 V. What is the resistance of the heating coil? a. 10 Ω b. 9.0 Ω c. 11 Ω d. 7.5 Ω

a. 10 Ω

Which of the following statements is true? a. Energy as heat flows from a higher temperature to a lower temperature. b. Energy as heat flows from a lower temperature to a higher temperature. c. Energy as heat flowing into an object is determined by the amount of work done on the object. d. The amount of heat in a closed system is a constant.

a. Energy as heat flows from a higher temperature to a lower temperature.

Which of the following statements is true? a. Frictional forces are greatest when both surfaces are rough. b. When a truck is parked on a hill, friction pulls the truck down the hill. c. Friction can exist between two objects even when they are not in contact. d. Air resistance always opposes friction.

a. Frictional forces are greatest when both surfaces are rough

The Great Red Spot, a hurricane-like storm with twice the diameter of Earth, is found on a. Jupiter. b. Titan. c. the sun. d. Saturn.

a. Jupiter.

Tides are observed around Earth's a. coastal areas. b. atmosphere. c. plains. d. mountains.

a. coastal areas.

The moon's surface is covered with a. oceans. b. craters. c. an atmosphere. d. ice.

b. craters.

Scientists can calculate the distance from the seismograph station to the focus using a. the difference in arrival times of S and surface waves. b. the difference in arrival times of P and surface waves. c. the difference in arrival times of P and S waves. d. None of the above

c. the difference in arrival times of P and S waves.

In a balanced ecosystem with predators and prey, if the number of prey decreases a. there will be no change in the ecosystem. b. the number of prey will eventually increase. c. the number of predators will decrease. d. new predators will move into the area.

c. the number of predators will decrease

Language is an example of a a. symbol. b. signal. c. script. d. code.

d. code.

On a bus traveling south at 15.0 m/s, a child walks south at 2.5 m/sec. What is the child's resultant velocity? a. 17.5 m/s south b. 12.5 m/s north c. 17.5 m/s north d. 12.5 m/s south

a. 17.5 m/s south

The reversal of Earth's magnetic poles, as indicated by the rock on the ocean floor, occurs on average every a. 200,000 years. b. 300,000 years c. 100,000 years. d. 400,000 years

a. 200 000 years

Calculate the mechanical advantage of a wrench that allows you to move a bolt 0.1 m by moving the handle 0.3 m. a. 3 b. 0.6 c. 0.33 d. 0.2

a. 3

Which of the following is a displacement? a. 3 miles north b. -0.2 ft/sec² c. 3 miles d. 7 ft/sec

a. 3 miles north

Which straight-line acceleration indicates an increase in speed? a. 4 m/s² b. 0 m/s² c. -15 m/s² d. All of these

a. 4 m/s²

A force of 240.0 N causes and object to accelerate at 3.2 m/s². What is the mass of the object? a. 75 kg b. 0.013 kg c. 240 kg d. 768 kg

a. 75 kg

A man pushes a crate along a factory floor by exerting a force of 100 N. If the crate moves a distance of 8.0 m, how much work does the man perform? a. 800 J b. 12.5 J c. 0.08 J d. 108 J

a. 800 J

Including Earth, there are _______ planets in the solar system. a. 9 b. 11 c. 12 d. 10

a. 9

______ is a pollutant that is released during combustion. a. Carbon dioxide b. Hydrogen c. Oxygen d. Methane

a. Carbon dioxide

The moon orbits a. Earth. b. Mercury. c. the sun. d. Saturn.

a. Earth.

______ is an example of using an alternative energy source. a. Owning a solar powered home b. Recycling c. Turning off the lights d. Carpooling

a. Owning a solar powered home

Which of the following statements is NOT true about ecosystems? a. Wildfires cause permanent loss of an ecosystem. b. Seasonal patterns can change an ecosystem. c. If disturbed, ecosystems tend to eventually balance out. d. All the elements of an ecosystem are interrelated.

a. Wildfires cause permanent loss of an ecosystem.

Which is an example of balanced forces acting on an object? a. a leaf lying on the grass b. a kangaroo jumping c. a cyclist slowing down d. a car turning a corner

a. a leaf lying on the grass

A solar heating system that utilizes an electric fan to move warm air throughout a home is called a(n) _______ system. a. active b. conductive c. passive d. convective

a. active

What happens immediately after a skydiver opens her parachute? a. air resistance greatly increases. b. the skydiver's speed greatly increases. c. the skydiver's in free-fall. d. the force of gravity greatly increases.

a. air resistance greatly increases

Over the telephone line, the sound waves from your voice are transmitted a. as variations in electric current. b. as vibrations. c. as longitudinal waves. d. without any conversion.

a. as variations in electric current.

All input devices provide data to the computer in the form of a(n) a. binary code. b. Morse code. c. atmospheric signal. d. radio signal.

a. binary code.

Which of the following is an example of an ecosystem? a. both Earth and a lake b. Earth c. a group of squirrels d. a lake

a. both Earth and a lake

An inclined plane a. changes both the magnitude and the direction of the force. b. changes the magnitude of the force only. c. decreases the amount of work done. d. changes the direction of the force only.

a. changes both the magnitude and the direction of the force.

Centripetal acceleration occurs because an object is a. changing direction. b. slowing down. c. speeding up. d. all of these.

a. changing direction

Groups of plants and animals that are adapted to similar conditions form a(n) a. community. b. organism. c. population. d. ecosystem.

a. community

When energy is transformed, the amount of usable energy a. decreases. b. None of these c. Increases. d. remains constant.

a. decreases

The process in which sediment is laid down is called a. deposition. b. weathering. c. cementation. d. erosion.

a. deposition.

The difference between speed and velocity is that velocity includes a. direction. b. weight. c. distance. d. time.

a. direction

Computers process binary data in groups of a. eight bits. b. eight bytes. c. ten bytes. d. ten bits.

a. eight bits.

When one feels a warm oven, the sensation of warmth is the result of a. energy transfer. b. molecular transfer. c. contraction of molecules. d. potential energy.

a. energy transfer

Specific Heats at 25°C ----------------------------------------------------------------------------- Substance - c (J/kg*K) ----------------------------------------------------------------------------- Water (liquid) - 4186 Steam - 1870 Ammonia (gas) - 2060 Ethanol (liquid) - 2440 Aluminum - 897 Carbon (graphite) - 709 Copper - 385 Gold - 129 Iron - 449 Mercury - 140 Lead - 129 Silver - 234 -----------------------------------------------------------------------------Which substance has a specific heat approximately 10 times greater than the specific heat of silver? a. ethanol b. water c. carbon d. mercury

a. ethanol

According to the nebular model, the planets of the solar system a. formed from small particles. b. are pieces of a larger planet. c. are comets captured by the sun. d. formed before the big bang.

a. formed from small particles.

A combustion engine uses what kind of energy to do work? a. heat b. radiation c. electrical d. solar

a. heat

Condensation causes a _______ effect to the surroundings. a. heating b. cooling c. radiation d. convective

a. heating

The friction between the bristle of your toothbrush and the surfaces of your teeth is an example of a. helpful friction b. all of these c. rolling friction d. static friction

a. helpful friction

The resistance of an insulator is a. high. b. very low. c. moderate. d. absent.

a. high

What is the major source of pollution? a. human activity b. ozone layer depletion c. natural greenhouse gases d. global warming

a. human activity

Which of the following is an example of an alternative energy source? a. a hydroelectric dam b. coal c. natural gas d. kerosene

a. hydroelectric dam

Which of the following is not a benefit of building a dam? a. increased need for fertilizers b. irrigation c. generating hydroelectric power d. flood control

a. increased need for fertilizers

The tendency of an object at rest to remain at rest is a. inertia. b. momentum. c. free fall. d. acceleration.

a. inertia

A signal is a sign that represents a. information. b. symbols. c. questions. d. dots and dashes.

a. information.

Free-fall acceleration near Earth's surface a. is the same for all objects. b. none of these. c. depends on an object's weight. d. depends on an object's mass.

a. is the same for all objects

Specific Heats at 25°C ----------------------------------------------------------------------------- Substance - c (J/kg*K) ----------------------------------------------------------------------------- Water (liquid) - 4186 Steam - 1870 Ammonia (gas) - 2060 Ethanol (liquid) - 2440 Aluminum - 897 Carbon (graphite) - 709 Copper - 385 Gold - 129 Iron - 449 Mercury - 140 Lead - 129 Silver - 234 ----------------------------------------------------------------------------- Using the table, determine which substance can absorb the most energy in a temperature increase of 1 K. a. liquid water b. aluminum c. gold d. lead

a. liquid water

A ramp is a ___________ that decreases the force required to move an object while increasing the distance the object travels. a. machine b. load c. newton d. force

a. machine

Force is a quantity made up of a. magnitude and direction. b. time and acceleration. c. mass and velocity. d. weight and speed.

a. magnitude and direction

A drill bit will get hot after extended use. This is because of a. mechanical heating. b. potential energy. c. solar heating. d. refrigeration.

a. mechanical heating

The continental crust is deepest beneath a. mountains. b. valleys. c. oceans. d. rivers.

a. mountains.

Which of the following is NOT a renewable resource? a. natural gas b. wind c. sunlight d. water

a. natural gas

The SI unit of force named for the scientist who described the relationship between motion and force is called the a. newton. b. einstein. c. curie. d. pasteur.

a. newton

Near Earth's surface an object's free-fall acceleration increases as its a. none of these. b. speed increases. c. mass increases. d. weight increases.

a. none of these

The principal of superposition says a. older rocks will be below newer rocks b. none of the above c. new and old rocks will be mixed d. newer rocks will be below older rocks

a. older rocks will be below newer rocks

Fossil fuels are formed when an organism's remains are deprived of a. oxygen. b. water. c. carbon. d. hydrogen.

a. oxygen

When nitrogen oxide compounds in car exhaust react with sunlight, the result is a. photochemical smog. b. acid rain. c. the greenhouse effect. d. nitrogen fixing.

a. photochemical smog

Which of the following animals are adapted to cold, wet places? a. polar bears b. lions c. elephants d. mosquitoes

a. polar bears

Solar panels gather ______ energy from the sun. a. radiated b. kinetic c. mechanical d. potential

a. radiated

Energy from the sun reaches Earth by a. radiation only. b. conduction only. c. conduction and radiation. d. conduction and convection.

a. radiation only.

If the net force acting on a stationary object is zero, then the object will a. remain at rest. b. accelerate in the direction of the strongest force. c. begin moving backwards. d. decelerate at a steady rate of speed.

a. remain at rest

How can the friction on a water slide be reduced? a. run a constant stream of water down the slide b. keep the surface of the slide dry c. increase the slope of the slide d. warm the surface of the slide

a. run a constant stream of water down the slide

Rain is naturally a. slightly acidic. b. slightly basic. c. very acidic. d. very basic.

a. slightly acidic.

A forest destroyed by a fire will gradually become a complex ecosystem with a wide variety of plants and animals in a process called a. succession. b. regeneration. c. development. d. evolution.

a. succession

If two objects with different masses and travelling with different velocities collide, what law allows you to predict the motion of the object's after the collision? a. the law of conservation of momentum b. the law of universal gravitation c. Newton's third law of motion. d. Newton's second law of motion.

a. the law of conservation of momentum

The strongest gravitational force occurs between Earth and a. the moon. b. Pluto. c. Venus. d. Jupiter.

a. the moon

An object is in motion when a. the object changes position relative to a stationary reference point. b. the object's speed increases. c. the object's displacement is greater than the distance traveled. d. you observe the object move.

a. the object changes position relative to a stationary reference point

Comets are probably made from leftover matter from the formation of a. the solar system. b. the sun. c. the gas giants. d. Earth.

a. the solar system.

Almost all energy on Earth comes from a. the sun. b. Earth's crust. c. fossil fuels. d. moving water.

a. the sun.

The minimum number of seismograph stations necessary to determine the location of an earthquake's epicenter is a. three. b. one. c. four. d. two.

a. three.

A cordless phone is a a. transceiver. b. receiver. c. transmitter. d. translocator.

a. transceiver.

When you talk on the telephone, the sound waves of your voice are converted to an electrical signal by a(n) a. transducer. b. conductor. c. receiver. d. insulator.

a. transducer.

An analog signal a. varies continuously within a range. b. shows only a single reading. c. never varies. d. uses a single flashing light.

a. varies continuously within a range.

Mercury is characterized by a. very extreme temperatures. b. large volumes of water. c. high atmospheric pressure. d. a thick atmosphere.

a. very extreme temperatures.

The SI unit of electric potential difference a. volt b. ohm c. watt d. ampere

a. volt

a lever or pulley connected to a shaft a. wheel and axle b. block and tackle c. wheelbarrow d. screw

a. wheel and axle

an example of a second-class lever a. wheelbarrow b. screw c. block and tackle d. wheel and axle

a. wheelbarrow

Nonpolluting sources of energy include a. wind, solar, and hydroelectric power. b. nuclear energy. c. alcohol and acetylene. d. coal, oil, and natural gas.

a. wind, solar, and hydroelectric power

A boy pushes on a parked car with a force of 200 N. The car does not move. How much work does the boy do on the car? a. zero b. 200 J c. 200 N d. can't be determined

a. zero

Which of the following does NOT indicate velocity? a. 80 km/h going from New York toward New Jersey b. 28 km from Los Angeles to Catalina Island c. 40 km/h toward the town square along the main street d. 14 m/s SSE

b. 28 km from Los Angeles to Catalina Island

How much power is required to do 200 J of work in 5 s? a. 1000 W b. 40 W c. 0.025 W d. 100 W

b. 40 W

Which will result in the greatest acceleration? a. 23 N acting on a 5-kg box b. 56 N acting on a 1-kg box c. 23 N acting on a 2-kg box d. 56 N acting on a 2-kg box

b. 56 N acting on a 1-kg box

The percent of the world's energy sources that are fossil fuels is a. 44%. b. 84%. c. 39%. d. 14%.

b. 84%

Two identical cars are traveling at equal speeds. One is going north and the other south. They collide head-on and stick together. How will the cars react after the collision? a. Both cars will move east b. Both cars will stop c. Both cars will move north d. Both cars will move south

b. Both cars will stop

_______ is the only planet in the solar system known to sustain life. a. Pluto b. Earth c. Mercury d. Uranus

b. Earth

__________ is the ratio of useful work output to work input a. Power b. Efficiency c. Kinetic energy d. Potential energy

b. Efficiency

Which of the following statements about geothermal energy is NOT true? a. It is an important source of energy in volcanically active areas. b. It is not a practical source of energy. c. It is a renewable source of energy. d. It works best when the magma pool is near the surface of Earth.

b. It is not a practical source of energy.

How does the total momentum of two objects before a collision compare with the total momentum after the collision? a. It is greater. b. It is the same. c. It is less. d. It is equal to zero.

b. It is the same

The asteroid belt exists between Mars and a. Saturn. b. Jupiter. c. Uranus. d. Earth.

b. Jupiter.

From Earth, __________ is a planet visible to the naked eye. a. Pluto b. Mercury c. the moon d. the sun

b. Mercury

Most comets come from the a. stars. b. Oort cloud. c. rings of Saturn. d. sun's corona

b. Oort cloud.

How is water used in a coal fired power plant? a. Hot water turns the generator. b. Steam from hot water spins the turbines. c. As water heats up, energy is released into the coals. d. Water is heated and reacts with the burning coal.

b. Steam from hot water spins the turbines.

Which of the following statements about ecosystems is NOT true? a. Ecosystems include living and nonliving things. b. Temperature and climate are not part of an ecosystem. c. An ecosystem can be as small as a rain puddle. d. Sunlight, air, and water can be parts of an ecosystem.

b. Temperature and climate are not part of an ecosystem

Which of the following is NOT true for BOTH gravitational and electric forces? a. The force depends on a physical property of objects. b. The force is either attractive or repulsive. c. The inverse square distance law applies. d. Potential energy is a function of the distance between objects.

b. The force is either attractive or repulsive

What does it mean when a change in velocity is negative? a. The object is changing direction. b. The object is slowing down. c. The object is speeding up. d. The object is falling down.

b. The object is slowing down

An airplane is flying at 635 km per hour at an altitude of 35,000 m. It is currently over Kansas and is approximately 16 minutes ahead of its scheduled arrival time. What is its velocity? a. 635 km/h b. This cannot be determined without further information about its direction. c. 35,000 m/s d. 16 m/min

b. This cannot be determined without further information about its direction

Which of the following statements about wind energy is NOT true? a. Windmills are currently being used to provide energy. b. Wind energy is a nonrenewable energy resource. c. Wind energy is used to sail ships. d. Wind energy is not a source of pollution.

b. Wind energy is a nonrenewable energy resource.

A seat belt helps you when your car stops suddenly by providing a(n) a. a balanced forward force. b. a balanced rearward force. c. a unbalanced forward force. d. a unbalanced rearward force.

b. a balanced rearward force

Which object has the greatest inertia? a. a tennis ball b. a bowling ball c. a volleyball d. a beachball

b. a bowling ball

Which is an example of projectile motion? a. a balloon rising in the air. b. a dart thrown at a dart board. c. a high speed train accelerating d. a rolling bowling ball

b. a dart thrown at a dart board.

A cathode-ray tube in a black-and-white TV makes a beam of electrons from a. electromagnetic signals. b. a negatively charged cathode. c. phosphors. d. a television camera.

b. a negatively charged cathode.

Which object does NOT have momentum? a. a feather falling to the ground b. a rock by the side of the road c. a boulder rolling down a hill d. a fish swimming in a pond

b. a rock by the side of the road

Which of the following is an example of a wheel and axle? a. a pulley b. a screwdriver c. a block and tackle d. a nutcracker

b. a screwdriver

Which of the following best illustrates balanced forces? a. a rock falling to the ground b. a stretched rubber band being held between two hands c. a crash between a large truck and a train d. a person lifting a heavy box off of the ground

b. a stretched rubber band being held between two hands

Which of the following objects exerts a gravitational force? a. a feather b. all of these c. a bowling ball d. a book

b. all of these

Which statement illustrates Newton's first law? a. As a car comes to a stop, the passengers continue to move forward. b. all of these c. A stone will not move unless something pushes or pulls it. d. A ball rolling across the floor eventually slows down.

b. all of these

Without friction you could not a. clean a pan. b. all of these c. write a letter. d. ride a skateboard.

b. all of these

Every charged particle produces a. a positive charge. b. an electric field. c. a negative charge. d. a magnetic field.

b. an electric field

The transfer of information by means of electromagnetic waves through space is called a. atmospheric convection. b. atmospheric transmission. c. atmospheric conduction. d. atmospheric radiation.

b. atmospheric transmission.

The distance traveled by an object divided by the time it takes to travel that distance is called a. average acceleration. b. average speed. c. average velocity. d. activity.

b. average speed

If the net force on an object is zero then the object has a. reaction forces. b. balanced forces. c. unbalanced forces. d. action forces

b. balanced forces

In order to determine speed, you must know a. distance b. both time and distance c. time. d. none of these

b. both time and distance

What is the largest source of sulfur dioxide air pollution? a. transportation b. burning fossil fuels in vehicles, power stations, and factories c. construction, agriculture, and unpaved roads d. the greenhouse effect

b. burning fossil fuels in vehicles, power stations, and factories

An example of a short-term ecological change is a. global temperature change. b. change in seasons. c. a volcanic eruption. d. a large and devastating forest fire.

b. change in seasons

Electric force varies depending on the a. mass and distance between charged objects. b. charge and distance between charged objects. c. height and mass of charged objects. d. charge and mass of charged objects.

b. charge and distance between charged objects

Carbonic acid dissolved in water is a a. physical weathering agent. b. chemical weathering agent. c. biological weathering agent. d. mechanical weathering agent.

b. chemical weathering agent.

Fossil fuels include a. dinosaur bones. b. coal, natural gas, and oil. c. hydrogen, oxygen, and acetylene. d. wood and charcoal.

b. coal, natural gas, and oil

Convection currents rise in air because a. hot air has less friction. b. cool air descends and hot air rises. c. the molecules in hot air move faster. d. hot air rises and cold air remains stagnant.

b. cool air descends and hot air rises.

Without the force of the sun's gravity, Earth would a. continue in orbit. b. fly off into space. c. move closer to the sun. d. stop moving.

b. fly off into space.

Friction is defined as a. speed of an object in a particular direction. b. force that opposes motion between two surfaces that are touching. c. resistance of an object to a change in its velocity. d. rate at which velocity changes.

b. force that opposes motion between two surfaces that are touching

A first-class lever has the a. input force in the middle. b. fulcrum in the middle. c. fulcrum at one end and the input force between the fulcrum and the output force. d. fulcrum at one end and the output force between the fulcrum and the input force.

b. fulcrum in the middle.

the energy due to motion a. non-mechanical energy b. kinetic energy c. potential energy d. mechanical energy

b. kinetic energy

A ramp is a simple inclined plane that allows one to apply an input force ___________ the output force. a. perpendicular to b. less than c. equal to d. greater than

b. less than

_____ allows Earth to sustain life a. an oxygen rich atmosphere b. liquid water and an oxygen atmosphere c. the moon's craters d. an abundance of liquid water

b. liquid water and an oxygen atmosphere

The solid outer layer of Earth consisting of the crust and the rigid upper mantle a. tectonic plate b. lithosphere c. asthenosphere d. metamorphic zone

b. lithosphere

The magma released from volcanoes is a. radioactive. b. molten rocks from the mantle and crust. c. liquid iron and nickel. d. material from the core.

b. molten rocks from the mantle and crust.

Which of the following is NOT considered an alternative source of energy? a. wind and water energy b. natural gas c. solar energy d. geothermal energy

b. natural gas

According to the _______ model, the solar system formed from a cloud of dust and gas. a. accretion b. nebular c. Newtonian d. Galilean

b. nebular

The combination of all of the forces acting on an object is called the a. union of forces. b. net force. c. total force. d. super force.

b. net force

The supply of fossil fuels is considered to be a. abundant. b. nonrenewable. c. abundant and nonrenewable. d. renewable.

b. nonrenewable

The primary source of the sun's energy is a. nuclear fission. b. nuclear fusion. c. potential energy. d. chemical energy.

b. nuclear fusion.

A computer monitor is an example of a(n) a. processing device. b. output device. c. storage device. d. input device.

b. output device.

Which of the following is not a characteristic of gas giants? a. ring structures b. rocky surfaces c. thick, gaseous atmospheres d. many satellites

b. rocky surfaces

A zone where oceanic crust dives beneath continental crust is called a zone of a. divergence. b. subduction. c. reduction. d. rifting.

b. subduction.

Which of the following shows how conductors, insulators, superconductors, and semiconductors rank in order of least resistance to most resistance? a. insulators, conductors, semiconductors, superconductors b. superconductors, conductors, semiconductors, insulators c. semiconductors, superconductors, conductors, insulators d. none of the above

b. superconductors, conductors, semiconductors, insulators

The magnitude of earthquakes is expressed using a. the Mercalli scale.. b. the Richter scale. c. the Mohs' scale d. the amplitude of the P waves.

b. the Richter scale.

There is an attractive force between two charged objects when a. they have the same number of protons. b. their charges are of unlike sign. c. their charges are of like sign. d. they have the same number of electrons.

b. their charges are of unlike sign

In the past 100 years the average temperature in the United States has increased by a. an amount too small to measure. b. 0.7° F. c. 0.7° C. d. 1.0° C.

c. 0.7° C.

A resistor has a resistance of 280 Ω. How much current is in the resistor if there is a potential difference of 28 V across the resistor? a. 0.43 A b. 2.3 A c. 0.l0 A d. 160 A

c. 0.l0 A

The temperature at which all molecular motion stops is a. All of these b. 0° F. c. 0° K. d. 0° C.

c. 0° K

Which of the following is the name of a temperature scale? a. Fahrenheit b. Celsius c. All of these d. Kelvin

c. All of these

Which of the following equations describes the reaction for burning methane? a. 6CH₄ + 6O₂ → C₆H₁₂O₆ + 6H₂O b. C + 2H₂ → CH₄ c. CH₄ + 2O₂ → CO₂ + 2H₂O d. 2CH₄ → C₂H₆ + H₂

c. CH₄ + 2O₂ → CO₂ + 2H₂O

______ are constructed to harness hydroelectric power. a. Wells b. Windmills c. Dams d. Solar cells

c. Dams

Which of the following statements about the ice ages is true? a. There were no living organisms during the ice ages. b. An ice age will never come again. c. During the ice ages, icy glaciers covered much of the continents. d. The causes of ice ages are well known.

c. During the ice ages, icy glaciers covered much of the continents.

Which of the following is not an inner planet? a. Venus b. Mars c. Jupiter d. Earth

c. Jupiter

The law that states that every object maintains constant velocity unless acted on by an unbalanced force is a. Newton's third law of motion. b. the law of conversation of momentum. c. Newton's first law of motion. d. Newton's second law of motion.

c. Newton's first law of motion

The law that states that the unbalanced force acting on an object equals the object's mass times its acceleration is a. the law of conservation of momentum. b. Newton's third law of motion. c. Newton's second law of motion. d. Newton's first law of motion.

c. Newton's second law of motion

Earth pulls on the moon and holds the moon in its orbit. The moon pulls on Earth with an equal and opposite force. This is an example of a. Newton's first law. b. Newton's second law. c. Newton's third law. d. None of the above

c. Newton's third law

The law that states that for every action force there is an equal and opposite reaction force is a. Newton's first law of motion. b. the law of conservation of momentum. c. Newton's third law of motion. d. Newton's second law of motion.

c. Newton's third law of motion

Which of the following does not affect a material's resistance? a. length b. temperature c. Ohm's law d. the type of material

c. Ohm's law

__________ is defined as the rate at which work is done. a. Mechanical advantage b. Speed c. Power d. Joule

c. Power

Which is NOT a way to reduce friction? a. Put ball bearings between wheels and axles. b. Use lubricants on engine parts. c. Set a paperweight on notebook paper. d. Make surfaces smoother.

c. Set a paperweight on notebook paper

A force is continuously applied to an object, causing it to accelerate. After a period of time, however, the object stops accelerating. What conclusion can be drawn? a. Gravity on the object has increased. b. The mass of the object has increased. c. The object is experiencing some kind of friction. d. The momentum of the object has reached a maximum.

c. The object is experiencing some kind of friction

Which of the following has a momentum of zero? a. all of these b. a plane flying through the air c. a newspaper lying on a table d. a leaf falling to the ground

c. a newspaper lying on a table

Which of the following is NOT a simple machine? a. a screw b. a lever c. a pair of scissors d. a wheel and axle

c. a pair of scissors

Which of the following situations best demonstrates the effects of friction? a. two trucks colliding b. a loaded slingshot c. a parachutist descending to the ground d. an apple falling from a tree

c. a parachutist descending to the ground

Which of the following is NOT a factor in calculating momentum? a. mass b. direction c. acceleration d. speed

c. acceleration

The burning of fossil fuels produces a. air pollution only. b. land pollution. c. acid rain and air pollution. d. acid rain only.

c. acid rain and air pollution

Mechanical energy can change to non-mechanical energy as a result of a. air resistance. b. friction. c. air resistance and friction. d. none of these.

c. air resistance and friction.

Accelerating can mean a. slowing down. b. speeding up. c. all of these. d. changing direction.

c. all of these

Displacement a. is the change in position of an object b. must be in a straight line c. all of these d. must be in a particular direction

c. all of these

Earthquakes occur mostly a. in the middle of continents. b. in the asthenosphere. c. at plate boundaries. d. at the edges of the continents.

c. at plate boundaries.

The area covered by each microwave relay antenna mounted on towers is called a a. region. b. box. c. cell. d. space.

c. cell.

Ptolemy proposed that the sun, moon, and planets orbited Earth in a. spheres. b. ellipses. c. circles. d. squares.

c. circles.

A device that protects a circuit from current overload is called a(n) a. closed circuit. b. capacitor. c. circuit breaker. d. resistor.

c. circuit breaker

Heat engines use ______ to convert potential chemical energy and internal kinetic energy into mechanical energy. a. convection b. conduction c. combustion d. radiation

c. combustion

Solar cells are used to a. convert sunlight and carbon dioxide into sugars. b. photograph sunspots. c. convert sunlight into electricity. d. convert electricity into solar energy.

c. convert sunlight into electricity.

The thin, solid outermost layer of Earth a. core b. mantle c. crust d. lithosphere

c. crust

A(n) _________ is a solution that conducts electricity a. terminal b. current c. electrolyte d. electrode

c. electrolyte

Microwaves are a form of a. sound waves. b. electric waves. c. electromagnetic waves. d. mechanical waves.

c. electromagnetic waves.

Whether or not charges will move in a material depends partly on how tightly _____ are held in the atoms of the material. a. neutrons b. resistors c. electrons d. protons

c. electrons

Which is an example of harmful friction? a. sand on icy roads b. all of these c. engine parts wearing out d. brakes stopping a car

c. engine parts wearing out

A car is parked on a hill. In order to keep the car from rolling downhill, how great must the static friction acting on the car be? a. greater than the force pulling the car downhill b. smaller than the force pulling the car uphill c. equal to the force pulling the car downhill d. greater than the force pulling the car uphill

c. equal to the force pulling the car downhill

Orbital motion is a combination of a. acceleration and gravity. b. weight and vertical velocity. c. forward motion and free fall. d. mass and friction.

c. forward motion and free fall

What force causes a skater sliding on the ice to gradually slow down? a. acceleration b. a balanced force c. friction d. inertia

c. friction

A device that has a metal strip that melts when a certain current is exceeded a. switch b. light c. fuse d. circuit breaker

c. fuse

The solar system is held together by a. inertia. b. orbits. c. gravitational forces. d. angular momentum.

c. gravitational forces.

When an object is in free-fall, the only force acting on it is a. inertia. b. friction. c. gravity. d. terminal velocity.

c. gravity

Astronauts float when inside an orbiting spaceship because they are a. weightless. b. in a vacuum. c. in free-fall. d. outside Earth's gravity.

c. in free-fall

What are the two families of simple machines? a. first class and second class b. pulley and screw c. inclined plane and lever d. wedge and compound

c. inclined plane and lever

A computer keyboard is an example of a(n) a. output device. b. processing device. c. input device. d. storage device.

c. input device.

Resistance is caused by a. proton charge. b. electron charge. c. internal friction. d. a heat source.

c. internal friction

What is a disadvantage to using wind as an energy source? a. radiation b. pollution c. interruptions d. high initial cost

c. interruptions

In an air conditioner, a substance that easily evaporates and condenses is used to transfer energy from a room to the air outside. When the substance evaporates a. energy is transferred by convection. b. it transfers energy as heat to the surrounding air. c. it absorbs energy as heat from the surrounding air. d. energy is transferred by conduction.

c. it absorbs energy as heat from the surrounding air

Igneous rock forms from a. weathered rock particles. b. evaporation of water. c. magma. d. None of the above

c. magma.

About 80 percent of Earth's volume is made up of a. crust. b. inner core. c. mantle. d. outer core.

c. mantle.

An object's momentum is determined by the object's a. mass and acceleration. b. weight and acceleration. c. mass and velocity. d. weight and velocity.

c. mass and velocity

A convergent boundary occurs where two plates a. move past each other. b. move over each other. c. move toward each other. d. move away from each other.

c. move toward each other.

Which of the following is NOT a pollutant caused by burning fossil fuels? a. volatile organic compounds b. nitrogen oxides c. nitrate ions d. carbon monoxide

c. nitrate ions

energy that lies at the level of atoms and that does not affect motion on a large scale a. kinetic energy b. potential energy c. non-mechanical energy d. mechanical energy

c. non-mechanical energy

A circuit in which two or more paths are connected to the voltage source a. short. b. series. c. parallel. d. open.

c. parallel

Which of the following is not a means of telecommunication? a. telephone b. telegraph c. postal delivery d. e-mail

c. postal delivery

An electric cell is a source of electric current because of a ______ between the terminals a. light b. resistance c. potential difference d. semiconductor

c. potential difference

Which is an example of static friction? a. driving a car up a hill b. pulling a skier behind a boat c. pushing a box that is at rest d. braking a car going down a hill

c. pushing a box that is at rest

Gas giants are known for their a. rocky exteriors. b. closeness to the sun. c. ring structures. d. lack of satellites.

c. ring structures.

Which is NOT an example of sliding friction? a. pushing a book across a table b. ice skating on a frozen pond c. rolling a ball across a desk d. taking notes with a pencil

c. rolling a ball across a desk

an inclined plane wrapped around a cylinder a. wheelbarrow b. wheel and axle c. screw d. block and tackle

c. screw

A dropped racquetball will not return to its original position because a. potential energy is inefficient. b. energy is not conserved. c. some of the mechanical energy is converted to non-mechanical energy. d. the mechanical energy is stored up for later bounces.

c. some of the mechanical energy is converted to non-mechanical energy

Which of these is constant during uniform circular motion? a. direction b. displacement c. speed d. velocity

c. speed

What is a satellite footprint? a. the blueprints used to make a communications satellite b. satellite debris left in space by a communications satellite c. the geographic region covered by a communications satellite d. the geographic region not covered by a communications satellite

c. the geographic region covered by a communications satellite

Venus is known for its a. ring system. b. abundance of life. c. thick atmosphere. d. enormous size.

c. thick atmosphere.

A tug-of-war that results in one team pulling the other across the line is an example of a. action forces. b. balanced forces. c. unbalanced forces. d. reaction forces.

c. unbalanced forces

The _______ of an object consists of its speed and direction. a. displacement b. average speed c. velocity d. instantaneous speed

c. velocity

Which of the following equations is correct? a. w = m/g b. w = g + m c. w = mg d. w = g/m

c. w = mg

An example of helpful friction is a. scraping your knee on the floor. b. getting holes in your socks. c. writing on paper with a pen. d. car tires wearing out.

c. writing on paper with a pen

One newton is the force that can give a mass of 1 kg an acceleration of a. 9.8 m/s². b. 9.8 m/s. c. 1 m/s². d. 1 m/s².

d. 1 m/s²

A 10.0 kg dog chasing a rabbit north at 6.0 m/s has a momentum of a. 60.0 kg/s. b. 0.6 kg * m/s. c. 60.0 m/s. d. 60.0 kg * m/s north.

d. 60.0 kg * m/s north

What is 37.0 degrees Celsius on the Fahrenheit scale? a. 102.0° F b. 87.0° F c. 92.0° F d. 98.6° F

d. 98.6° F

A mineral a. has a chemical formula. b. has a characteristic internal structure. c. occurs naturally. d. All of the above

d. All of the above

DDT was banned from use as a pesticide in the United States because a. it was ingested by fish and other aquatic animals. b. it caused the eggs of fish-eating birds to become thin and frail. c. it was washed by rain into streams, rivers, lakes, and ponds. d. All of the above

d. All of the above

Earth's atmosphere protects it from a. space debris. b. high-energy solar particles. c. ultraviolet radiation. d. All of the above

d. All of the above

Electric field lines a. point away from a positive charge. b. never cross one another. c. point toward a negative charge. d. All of the above

d. All of the above

The nebular model explains a. why the planets are all widely separated. b. why the inner and outer planets differ. c. the presence of comets and asteroids. d. All of the above

d. All of the above

A digital signal is a. based on the binary number system. b. a signal that can be interpreted as a sequence of digits. c. composed of discrete fixed values. d. All of the these

d. All of the these

Gravitational potential energy depends on the a. the height of the object. b. the mass of the object. c. the acceleration due to gravity. d. All of these

d. All of these

What are the units of power? a. horsepower b. watts c. joules per second d. All of these

d. All of these

What are the units of work? a. J b. N*m c. kg*m²/s² d. All of these

d. All of these

Optical fibers a. are smaller and lighter than wire cables. b. carry signals that are represented by pulses of light. c. are about 7.6 cm in diameter. d. Carry signals that are pulses of light and are smaller and lighter than wire cables.

d. Carry signals that are pulses of light and are smaller and lighter than wire cables.

_________ describes how much energy is required to raise an objects temperature. a. Radiation b. Conduction c. Convection d. Specific heat

d. Specific heat

A force is continuously applied to an object, causing it to accelerate. After a period of time, however, the object stops accelerating. What conclusions can be drawn? a. The mass of the object has increased. b. Gravity on the object has increased. c. The momentum of the object has reached a maximum. d. The object is experiencing some kind of friction.

d. The object is experiencing some kind of friction

In the absence of air resistance, how would the acceleration of a 1.5 kg book and the acceleration of a 15 kg rock differ if the objects were dropped from the same height? a. The book would accelerate twice as fast as the rock. b. The rock would accelerate twice as fast as the book. c. The book would accelerate ten times as fast as the rock. d. They would not differ; they would be the same.

d. They would not differ; they would be the same

The Fahrenheit temperature scale is defined by which of the following temperatures? a. Water boils at 100 degrees and freezes at 32 degrees. b. Liquid water turns to a gas at 100 degrees and to a solid at 0 degrees. c. Water evaporates at 212 degrees and freezes at 0 degrees. d. Water boils at 212 degrees and freezes at 32 degrees.

d. Water boils at 212 degrees and freezes at 32 degrees.

Which of the following is not a computer input device? a. a scanner b. a keyboard c. a mouse d. a printer

d. a printer

Which of the following is not in the inclined plane family? a. a ramp b. a wedge c. a screw d. a wheel and axle

d. a wheel and axle

Temperature is a. proportional to the average kinetic energy of molecules. b. measured with thermometers. c. associated with the sensation of hot and cold. d. All of the above

d. all of the above

Plants utilize carbon dioxide that is produced by a. fossil fuel burning. b. cellular respiration. c. decomposition. d. all of these.

d. all of these

Which is an example of human activity impacting an ecosystem? a. newly planted trees in a wooded area b. introduction of a nonnative species c. construction of a dam d. all of these

d. all of these

The inner planets are called terrestrial because they a. have no atmosphere. b. have Earth-like oceans. c. are visible from Earth. d. are small and highly dense.

d. are small and highly dense.

Microwaves are used for sending telecommunication signals in a. underground cables. b. fiber-optic networks. c. wire-cable networks. d. atmospheric transmission.

d. atmospheric transmission.

A cold-blooded reptile basks on a warm rock in the sun. Its body is warmed by a. conduction. b. radiation. c. convection. d. both (a) and (b)

d. both (a) and (b)

How does carbon dioxide keep Earth warm? a. by combining with water vapor b. by reacting with fossil fuel c. by reacting with nitrogen d. by trapping radiation in the atmosphere

d. by trapping radiation in the atmosphere

A _______ is made of a group of living things that interact. a. population b. species c. ecosystem d. community

d. community

Current is the rate at which charges move through a(n) a. joule. b. voltage. c. insulator. d. conductor.

d. conductor

When velocity changes by the same amount over each time interval, acceleration is a. positive b. negative c. zero d. constant

d. constant

When objects are moved farther apart from each other, the force of gravity a. stays the same. b. decreases at first and then increases. c. increases. d. decreases.

d. decreases

Average speed can be represented by the mathematical expression a. time - distance b. time + distance c. time * distance d. distance / time

d. distance / time

The electric force between charged objects is a. neither attractive nor repulsive. b. attractive only. c. repulsive only. d. either attractive or repulsive.

d. either attractive or repulsive

For radio broadcast, sound signals are converted to a. visible light waves. b. ultraviolet waves. c. infrared waves. d. electromagnetic waves.

d. electromagnetic waves.

Which of the following is a negatively charged particle? a. volt b. neutron c. proton d. electron

d. electron

Whenever an object is still, the value(s) that is always zero is/are a. velocity. b. speed. c. momentum. d. energy.

d. energy

The location on the surface of the Earth directly above where an earthquake happens a. fault b. vent c. focus d. epicenter

d. epicenter

When the velocity of an object changes, it is acted upon by a(n) a. deceleration. b. momentum. c. inertia. d. force.

d. force

Sedimentary rocks are the only rocks that can potentially contain a. minerals. b. faults. c. fractures. d. fossils.

d. fossils.

The weight of an object can be calculated by multiplying mass by a. speed. b. distance. c. velocity. d. free-fall acceleration.

d. free-fall acceleration

Which is an example of kinetic friction? a. friction between a sticky note and the page of a book as it marks your place b. friction between your skin and a pencil as it rests in your palm c. friction between your shoes and the ground when you stand still d. friction between a car's windshield and the air as you drive into the wind

d. friction between a car's windshield and the air as you drive into the wind

Geothermal energy is not used world-wide because it is a. inefficient. b. very costly. c. nonrenewable. d. geographically limited.

d. geographically limited

One disadvantage of analog signals is that they a. can transmit a lot of information in a short time. b. can be turned on and off frequently. c. can be sent quickly. d. get distorted after several transmissions.

d. get distorted after several transmissions.

In a computer, the operating system is stored on a. a floppy drive. b. a scanner. c. the hard drive. d. hardware.

d. hardware.

When a bowling ball hits a pin, some of the balls momentum a. doubles in force. b. is lost. c. increases the pin's mass. d. is transferred to the pin.

d. is transferred to the pin

Carbon dioxide is called a greenhouse gas because a. it is used inside of greenhouses. b. plants need carbon dioxide to grow. c. it is produced when wood or fossil fuels are burned. d. it helps keep our planet warmer than outer space.

d. it helps keep our planet warmer than outer space

A pollutant that does not dissolve easily in water causes a. global warming. b. smog. c. air pollution. d. land pollution.

d. land pollution

The SI unit for acceleration is a. ft/s². b. ∆v/t. c. mph. d. m/s²

d. m/s²

Which of the following is NOT a type of electric cell? a. electrochemical b. thermoelectric c. photoelectric d. mechanical

d. mechanical

When there is an equal amount of positive and negative charges on an object, the object is a. positively charged. b. negatively charged. c. supercharged. d. neutral.

d. neutral

The SI unit of resistance is the a. ampere. b. volt. c. joule. d. ohm.

d. ohm.

Batteries typically have a. two negative terminals. b. two positive terminals. c. no terminals. d. one positive and one negative terminal.

d. one positive and one negative terminal

When a computer is first turned on, the first program executed by the computer is the a. word processing system. b. control system. c. experimental system. d. operating system.

d. operating system.

Weathering that does NOT alter the chemical composition of the rock is called a. chemical weathering. b. biological weathering. c. acid weathering. d. physical weathering.

d. physical weathering.

The smallest piece of an electronically produced picture is called a a. ray. b. byte. c. bit. d. pixel.

d. pixel.

The force exerted on the racket by a hit tennis ball is the a. gravitational force. b. action force. c. acceleration. d. reaction force.

d. reaction force

The total amount of energy (both usable and unusable) in any process a. decreases. b. varies. c. increases. d. remains constant.

d. remains constant

Fossil fuels come from a. living plants and animals. b. soil. c. atomic reactions. d. remains of dead organisms.

d. remains of dead organisms

The breakage of rocks along a fault line releases energy in the form of a. light. b. heat. c. P waves. d. seismic waves.

d. seismic waves.

Which of these is made from an insulating material? a. aluminum pan b. steel fork c. brass nail d. styrofoam cup

d. styrofoam cup

As the kinetic energy of the molecules in a substance increases, the a. potential energy of the substance changes. b. temperature of the substance decreases. c. temperature remains the same. d. temperature of the substance increases.

d. temperature of the substance increases

When gravitational forces and air resistance equalize on an object that is falling towards Earth and the object stops accelerating, what is the velocity of an object called? a. average velocity b. instantaneous velocity c. resultant velocity d. terminal velocity

d. terminal velocity

Weight is best described as a. a force solely dependent on an object's mass. b. an object's resistance to acceleration. c. what causes an object to fall. d. the downward force exerted on objects due to gravity.

d. the downward force exerted on objects due to gravity

A code is a. a change in a signal. b. a special kind of signal. c. unrelated to signals. d. the meaning of a signal.

d. the meaning of a signal.

Tides on Earth are caused primarily by a. Jupiter's gravitational force. b. Earth's landscape. c. the sun's gravitational force. d. the moon's gravitational force.

d. the moon's gravitational force.

Scientists believe Earth's moon was a. captured by Earth's gravity. b. formed before Earth. c. formed at the same time as Earth. d. the result of a collision.

d. the result of a collision.

If an equal force is applied to two cars of equal mass, Car A and Car B, Car A will have __________ acceleration as(than) Car B. a. the opposite b. less c. greater d. the same

d. the same

Sedimentary rocks are named according to a. the type of minerals they contain. b. where they were formed. c. when they were formed. d. the size of the fragments they contain.

d. the size of the fragments they contain.

Which of the following is not a function of a computer? a. processing b. input c. storage d. thinking

d. thinking

Acceleration is defined as the change in velocity divided by a. final velocity. b. speed. c. distance. d. time.

d. time

Bacteria and algae in a pond sometimes kill fish and other aquatic wildlife because they a. crowd out other forms of life. b. infect other organisms and cause diseases. c. secrete a poisonous substance. d. use up most of the oxygen in the water.

d. use up most of the oxygen in the water