nmat p6

c

A 10-meter object is placed at a distance of 100 meters in front of a lens whose focal length is 50 meters. Which of the following describes the image formed? A. It is 4 meters long and inverted B. It is 4 meters long and erect. C. It is 10 meters long and inverted D. It is 10 meters long and erect.

d

A 100 g copper initially at 750C is put inside an aluminium container with a piece of silver amounting to a mass of 200 grams and with water at 100C. Which of the following statement/s given must be TRUE? I. The final temperature of the system will be less than 800C. II. Copper loses heat while silver and water absorbs heat. III. The temperature of silver and water increases and the temperature of copper decreases. IV. The temperature of copper, silver, and water will eventually be equal. a. I and II only c. I, II, and III only b. I and III only d. I, II, III, and IV

c

A 1200-watt heater is used for raising the temperature of 1 liter of water to boiling point. How long will it take for the water to boil if the initial temperature of water is 20˚C? (1 cal = 4.19 joules) A. 28 s B. 70 s C. 279 s D. 349 s

d

A 200-kg lift is raised by an electric motor through a height of 15 m in20 seconds (g = 10 ms2). a. The weight of the lift is 2,000 N. b. The useful work done is 30,000 J. c. The power output of the motor is 1.5 kW. d. All of the above statements are correct.

d

A 25-kg metallic ball is elevated to a height of 1 km. It is released and falls straight down. Let g = 10 m/s2. Air resistance is negligible. How many seconds does it take for the ball to hit the ground? a. 28.2 s c. 17.6 s b. 21.2 s d. 14.1 s

b

A 25-kg metallic ball is elevated to a height of 1 km. It is released and falls straight down. Let g = 10 m/s2. Air resistance is negligible. What is its kinetic energy halfway through the trip? a. 2.5 kJ c. 250 kJ b. 125 kJ d. 125,000 kJ

c

A 25-kg metallic ball is elevated to a height of 1 km. It is released and falls straight down. Let g = 10 m/s2. Air resistance is negligible. What is the potential energy after travelling 5 seconds? a. 25 kJ c. 218.75 kJ b. 31.25 kJ d. 250 kJ

d

A 5 cm object is placed 15 cm in front of a convex lens whose focal length is 12 cm. Which of the following describes the image formed? a. It is 20/9 cm long and inverted. b. It is 20/9 cm long and upright. c. It is 20 cm long and upright. d. It is 20 cm long and inverted.

a

A Carnot refrigerator takes heat from water at 0˚C and rejects heat to a room at 27˚C. if 50 kg of water at 0˚C is converted to ice at 0˚C, how much energy must be supplied to the refrigerator? A. 4.60 × 10-4 kwh C. 4.00 × 10-5 kwh B. 3.90 × 10-4 kwh D. 2.62 × 10-5 kwh

a

A body thrown vertically up into the air possesses kinetic energy at the beginning of its flight, but as it rises, it loses kinetic energy and acquires potential energy with respect to the level from which it started. Which of the following is NOT likely to happen? A. The kinetic energy is minimum at the lowest point of its flight B. As it falls, its potential energy is again is transformed to kinetic energy. C. The potential energy is maximum at the highest point of its flight D. When it reaches the highest point the kinetic energy was wholly changed to potential energy

a

A boy ties on end of a string and spins it vertically as shown by the diagram on the right. At which point is the tension greatest? a. at the bottom b. at the side c. at the top d. at all points

c

A capacitor acquires 0.0018 coulomb when 60 volts is applied. Its capacitance is A. 0.3 microfarad C. 30.0 microfarad B. 3.0 microfarad D. 300.0 microfarad

b

A capacitor acquires 0.004 coulomb when 50 volts is applied. Its capacitance is a. 0.8 microfarad c. 8.0 microfarad b. 80.0 microfarad d. 800.0 microfarad

a

A car of mass 800 kg is being driven along a level road. This engine supplies a forward force of 3600 N and the total resistive force is 2000 N. What is the acceleration of the car? a. 2.0 m/s2 c. 4.5 m/s2 b. 2.5 m/s2 d. 7.0 m/s2

c

A car travels in a circle at constant speed. Which of the following is TRUE about the net force on the car? A. zero because the car is not accelerating B. directed towards the direction of travel C. directed towards the center of the circle D. none of the above

d

A certain solar cooker is made of a big concave mirror. To get the greatest amount of reflected sunlight, where should the food be placed? A. Above the center of the curvature of the mirror B. At the center of the curvature of the mirror C. Between the focus and the center of curvature of the mirror D. At the focus of the mirror

b

A concave mirror has a 10-cm focal length. If an object 5 cm. wide is placed 25 cm in front of the mirror, the image is: a. Virtual and reduced c. Virtual and enlarged b. Real and reduced d. Real and enlarge

d

A force of 80 newtons is used to raise a 300-newton load using a system of pulleys. The load covered a distance of 1 m for every 5 m of rope pulled through the system. The system has an efficiency of A. 12% C. 60% B. 48% D. 75%

b

A glass flask which is partly filled with water is heated over a Bunsen flame. As soon as the water begins to boil, the flask is removed from the flame and tightly stoppered immediately. Boiling stops. When cold water is poured in the surface of the flask, which of the following will happen to the water inside the flask? A. It will begin to boil again since the contraction of the flask reduces the pressure inside. B. It will begin to boil again since the condensation of the steam reduces the pressure inside. C. It will not boil since the temperature is less than 100˚C. D. It will not boil since the contraction of the flask increases the pressure inside.

a

A heavy stone and a light feather fall side by side in a vacuum. Which of the following statements about the situation is FALSE? I. In the vacuum, equal forces of gravity act on both the stone and the feather. II. The two objects accelerate equally because the ratios of their weights to masses are equal. III. Air resistance is not present and so the two objects accelerate at the same rate. IV. The two objects have equal masses and equal weights. a. I and IV c. IV only b. II and III d. All are true.

b

A lemon is colored yellow because A. It absorb only yellow light B. It reflects only yellow light C. Only yellow light can pass through a yellow lemon D. Only yellow light actually hits the lemon

c

A man weighing 700 Newtons climbs a flight of stairs 7 meters high? How much work does he do? a. 100 joules c. 4,900 joules b. 693 joules d. 707 joules

c

A man with a mass of 80 kg wants to play seesaw with his son whose mass is only 40 kg. To balance the force he exerts with that of his son, how far should he sit from the fulcrum if his son sits 4 meters from it. a. 4 meters c. 2 meters b. 3 meters d. 1 meter

b

A metal cube is heated in Bunsen flame and then dropped into an insulated beaker containing water. The masses of the water, the beaker, and the cube, the initial and the final temperatures of the water, and the beaker are known. Without further measurements, which of the following can be calculated? A. The density of the cube B. The specific heat capacity of the cube C. The thermal conductivity of the cube D. The specific latent heat of the cube

c

A metal initially at 1000C is immersed in lukewarm water. What can be observed from this? A. The water's temperature will decrease. B. The water evolves heat to the metal. C. The metal cools at a temperature less than 1000C. D. All of the above

a

A nail is driven 1.5 m from the ground of a 3.5 m tall tree. When the tree grows to a height of 7 m, the nail is how many meters from the ground? a. 1.5 m c. 2 m b. 3m d. 2.5 m

a

A pingpong ball and a golf ball are dropped in a vacuum chamber from the same time. When they have fallen halfway, they have the same A. Velocity C. Acceleration B. Kinetic energy D. Potential energy

a

A rock of mass m is dropped to the ground from a height h. A second rock with mass 2m is dropped from the same height. When the second rock strikes the ground, its kinetic energy is... a. twice that of the first rock b. four times that of the first rock c. the same as that of the first rock d. half as much as that of the first rock

a

A solid whose volume is 9 𝑚3 and weighing 750 kg is dropped into a pool of fresh water. The weight of the water it displaces is greater than 750 kg. Which of the following will happen? a. The solid will float. b. The solid will sink. c. The solid will be suspended. d. The solid will float then sink.

a

After a cannon ball has been fired into a frictionless space, how much force is needed to keep it going? A. zero, since no force is necessary to keep it going B. one-half the force with which it was fired C. twice the force with which it was fired D. the same amount of force with which it was fired

d

An 80-kg mountain climber dangling in a crevasse stretches a 50-m long rope with a cross-sectional area of 0.00008 m2 by 8.0 cm. What is the Young's modulus of the rope, in N/m2? A. 6.25 x 102 C. 6.25 x 1010 B. 6.25 x 1024 D. 6.25 x 109

b

An astronaut weighs 588 Newtons on Earth. The gravity of the moon is 1/6 of the Earth's gravity. Acceleration due to gravity on Earth is 9.8 m/s2. What is the astronaut's mass on earth? a. 98 kg b. 60 kg c. 960.4 kg d. 597.8 kg

a

An astronaut weighs 588 Newtons on Earth. The gravity of the moon is 1/6 of the Earth's gravity. Acceleration due to gravity on Earth is 9.8 m/s2. What would be the astronaut's weight on the moon? a. 98 N b. 60 N c. 960.4 N d. 597.8 N

d

An electron is traveling at 1% the speed of the light. What is the kinetic energy in joules? (speed of light = 3 × 108 m/s) A. 4.000 × 10−18 J B. 4.098 × 1010 J C. 4.000 × 1018 J D. 4.098 × 10−18 J

d

At what angle between two vectors will the magnitude of the resultant of the two vectors be minimum? A. 0˚ C. 90˚ B. 45˚ D. 180˚

a

Based on the figure, book X is on top of book Y which is on top of a table. If the books and the table are all at rest, which of the following statement/s is/are TRUE? I. The force exerted by book Y on book X is equal in magnitude to the weight of book X. II. The force exerted by the table on book Y is equal in magnitude to the total weight of the table, book Y, and book X. III. The force exerted by the table on book Y is equal in magnitude to the force exerted by book X on book Y. a. I only c. I and III only b. I and II only d. I, II, and III

a

Bernoulli's principle states that A1V1=A2V2. Blood flows from artery A1, whose cross-sectional area is 50μ2, at a velocity of 30 mm/s to its more peripheral branches, A2, A3, A4, and A5. If the total cross-sectional area of the branches is 500 μ2 and each branch has exactly the same diameter as the other, what is the velocity of the blood in the branches? A. 3.0 mm/s C. 10.0 mm/s B. 1.0 mm/s D. 2.0 mm/s

b

Both light and sound travel in waves. In a vacuum.. a. only sound can travel b. only light can travel c. both light and sound can travel d. neither can travel

b

Car A has a mass of 1,000 kg and a speed of 60 km/hr while car B has mass of 2,000 kg and a speed of 30 km/hr. The kinetic energy of a car A is: a. half that of car B c. equal to that of car B b. twice that of car B d. four times that of car B

a

Compared to the speed of light, the speed of sound in air is: a. slower c. indeterminable b. the same d. faster

b

Compared to the wavelengths of visible lights, the wavelength of the radiation in A and B are A. Shorter B. Longer C. Just as long D. Not measurable

d

Electroplating results in a better quality product by applying a relatively A. Strong current for a shorter time B. Strong current for a longer time C. Moderate current for a shorter time D. Moderate current for a longer time

b

Extremely high gravitation causes time to: a. Speed up c. Exhibit no change b. Slow down d. Fluctuate between fast and slow

c

From the figure above, what type of image will be formed? (convex) A. Real and upright C. Virtual and upright B. Real and inverted D. Virtual and inverted

d

Gravitational force and electrostatic force both depend on _____. a. The same constant c. Charge b. Mass d. Distance

c

How many calories of heat are given off when 200 grams of water is cooled from 100˚C to 30˚C? A. 2,000 cal C. 14,000 cal B. 4,000 cal D. 20,000 cal

b

How many images will be formed if a boy stands in front of two mirrors standing at a 40˚angle to each other? A. 5 B. 8 C. 7 D. infinite

a

If a horse pulls on a calesa at rest, the calesa pulls back equally as much on the horse. Will the calesa be set into motion? A. No, because the forces cancel each other B. Yes, because there is a net force acting on the calesa. C. Yes, because there is a time delay between action and reaction D. Yes, because the horse's pull on the calesa is larger than the calesa 's pull on the horse.

b

If the absolute temperature of a gas is increased four times and its pressure is doubled, then the volume will A. Increase six times C. Decrease six times B. Increase two times D. Decrease two times

c

If the coefficient of sliding friction of iron on concrete is 0.30, what force is required to pull an iron box weighing 70 newton across a concrete floor? a. 70.30 N c. 21 N b. 2333.33 N d. 140 N

a

In an experiment, the students slide a box over a flat surface. Then, they put pencils under the box and move it again over the same surface. This simple experiment can illustrate how ____ can be reduced. a. friction c. weight b. gravity d. mass

a

In the diagram above, the focal length of the lens is F. No image will be projected on the screen if a candle is placed A. Between F and the lens C. Beyond 4F B. At 3F D. At 2F

c

In which of the following activities is work done equal to zero? a. Pushing a cart to a distance of 8 meters b. Carrying books from home to school c. Lifting a sack of rice d. Carrying a pale of water from the kitchen to the garage

a

In which of the following items is the center of gravity located at a point where there is no mass? A. tennis racket C. boomerang B. billiard ball D. discus

a

In which situation is there work done on the system? A. a basket being lifted B. a man carrying a bag of content on his shoulder C. a boy pushing against the wall D. a weightlifter holding a barbell in the air

a

Jannette shoots a projectile from a gun making an angle of 150 with the horizontal. The initial velocity of the bullet is 100 m/s. Assume that g = 10 m/s2. After 5 seconds, what is the bullet's acceleration along the x-axis? a. 0.00 m/s2 c. 96.6 m/s2 b. 10.0 m/s2 d. 100.00 m/s2

c

Light goes from medium A to medium B at an angle of incidence of 30 degrees. The angle refraction is 40 degrees. The speed of light in B: a. is less than in A b. is the same as that in A c. is greater than that in A d. may be any of the above, depending on the specific medium

b

Light of which the ff. colors has the shortest wavelength? a. red b. blue c. yellow d. green

c

Orange light has a wavelength of 6 x 10-7 m. What is the frequency? The speed of light is 3 x 108 m/s. A. 2 x 1015 Hz C. 5 x 1014 Hz B. 2 x 10-15 Hz D. 5 x 10-14 Hz

d

Parallel rays for light passing through a convex lens can be made parallel again by passing them through: a. a glass plate c. translucent paper b. concave lens d. another convex lens

a

Prior to analysing a liver sample, Ceres places it in an eppendorf tube and proceeds to centrifuge it. If the centrifuge has a diameter of 50 cm and the tube is experiencing an acceleration of 25,600 m/s2 towards the center of the machine, what speed is the tube undergoing as it rotates? a. 80 m/s b. 510 m/s c. 800 m/s d. 6,400 m/s

d

The amount of work a 0.6 KW electric drill can do in 1 min is... a. 0.6 J c. 0.6 KJ b. 36 J d. 36 KJ

a

The atomic reaction where 5𝐶 13 becomes 𝐶 6 13 results in the release of A. A negative beta particle B. An alpha particle C. A beta particle D. A gamma particle

a

The immediate source of water which forms dew on grass on a summer morning is the A. Air B. Soil C. Grass D. Cloud

b

The lowest frequencies are found in: a. x-rays c. ultraviolet light b. radio waves d. radar waves

c

The maximum speed of electrons produced by incident photons on a metal depends only on the: a. temperature c. frequency of the incident light b. electric field d. intensity of the incident light

d

The pressure exerted by hydrogen gas in a 5-liter container is 780 mm. What pressure does this same quantity of hydrogen gas will exert in a 3-liter container? a. 2,200 mm c. 3,900 mm b. 260 mm d. 1,300 mm

c

The radiation from a sample of Krypton-85 decrease to one-fourth of the original intensity Io in a period of 18 years. What would be the intensity after 18 more years? A. Io C. B. 1/16Io C. 1/3Io D. 1/9 Io

a

The range limit of human hearing is 20Hz - 20kHz. If the speed of sound is 345 m/s, what is the lowest wavelength possible for human hearing? A. 17.25 mm B. 17.25 cm C. 17.25 dm D. 17.25 m

d

The speed of sound in air at 200C is 344 m/s. What is the wavelength of the note produced by a piano key, if it has a frequency of 10Hz? A. 68.8 m B. 137.6 m C. 860 m D. 34.40 m

a

The volume of gas at 20oC is 100 mL. What will be its volume at 100oC? a. 127.3 mL c. 2,000 mL b. 200 mL d. 150.5 mL

b

Two identical balls collide head on. If the initial velocity of the first ball is 2 m/s while the other one is 0.5 m/s, what will be the final velocity of the second ball if the first ball stopped when they collide? a. 0 m/s c. 2 m/s b. 1.5 m/s d. 2.5 m/s

c

Vincent places a clock inside a moving vehicle. For an observer at rest outside the vehicle, the clock would: a. Run at the same rate as a clock at rest b. Run faster than a clock at rest c. Run slower than a clock at rest d. Fluctuate between running fast and running slow

b

Wavelength is inversely proportional to: a. Wave speed c. Both A and B b. Frequency d. Neither A nor B

a

What are the factors that determine the speed of a satellite which moves in a stable orbit around a planet? (G represents the universal gravitational constant.) A. Orbital radius of the satellite, mass of the planet, & G B. Mass of the satellite and G C. Mass of the satellite, mass of the planet, and G D. Mass of the planet and G

a

What color in visible spectrum has the longest wavelength? a. Red b. Yellow c. Blue d. Violet

c

What is the potential difference in an electric circuit with a total resistance of 25k when a 5 mA current passes through it? A. 25 V B. 50 V C. 125 V D. 250 V

a

What kind of spherical mirror must be used, in order to give an inverted image 1/3 as large as an object placed 15 cm in front of it? a. Convex mirror c. Plane mirror b. Concave mirror d. Pocket mirror

a

What would happen to the temperature and pressure of the air inside the bus tires if the bus travels over a long distance on a very hot day? a. The air inside the tire increases in temperature; therefore, pressure increases. b. The air inside the tire increases in temperature; therefore, volume increases c. The air inside the tire decreases in temperature; therefore, volume decreases d. The air inside the tire increases in temperature; therefore, pressure decreases.

a

When a beam of light enters one medium from another, a quantity that never changes its: a. wavelength b. frequency c. speed d. direction

a

When a car accelerates along a road, what force actually moves the car forward? a. The road pushes the car forward as the tires push backward. b. Air resistance pushes the car forward as the car ejects a stream of gases backward. c. The normal force pushes the car forward as friction counteracts this force in the backward direction. d. The driver's feet on the gas pedal alone gives enough force to push the car forward.

d

When a large atom such as U splits into two smaller atoms, then the combined mass of the products resulting from the splitting will be A. One half of the original mass B. Two times more than the original mass C. One half more than the original mass D. The same as the original mass

d

When a sound wave goes from air into water, the quantity that remains unchanged is its... a. velocity c. frequency b. speed d. amplitude

d

Which is true about the wave nature of sound and that of light? which can travel even without any medium. A. Sound waves and light waves are both electromagnetic waves and do not need any medium to be able to travel. B. Sound waves and light waves are both longitudinal waves and both need a medium to travel. C. Sound waves are electromagnetic waves and can travel without any medium, while light waves are electromagnetic waves, which needs a medium to travel. D. Sound waves are longitudinal waves which need a medium to travel while light is an electromagnetic wave

d

Which of the following cannot create or induce a magnetic field? a. A moving charge b. A straight current-carrying conductor c. A circular current-carrying loop d. None of the above

b

Which of the following does not belong to the group? A. cryogenics C. solid state physics B. relativity D. kinematics

c

Which of the following explains the appearance of a rainbow in the sky after a rainstorm? A. The white clouds are actually prisms composed of different colors. B. Sunlight reflected by the ground separates into different colors in the sky. C. Raindrops act as prisms that separate into its components D. None of these

b

Which of the following factors is responsible for transmitting waves? a. mass c. wavelength b. energy d. amplitude

a

Which of the following is true when the magnetic flux through a coil at 100 turns is reduced from 0.25 weber to 0 weber in 0.2 second? a. The induced emf in the coil is 125 volts b. The induced emf in the coil is 120 volts c. The emf is 220 volts d. The emf is 225 volts

d

Which of the following is true when the magnetic flux through a coil at 200 turns is reduced from 0.25 weber to 0 weber in 0.2 second? A. The emf is 250 volts. B. The induced emf in the coil is 220 volts. C. The emf is 220 volts. D. The induced emf in the coil is 250 volts.

c

Which of the following result if the number of lines in a diffraction grating of a given width is decreased? A. The wavelengths can be diffracted will be shorter B. The wavelengths that can be diffracted will be longer. C. The spectrum produced will be narrower. D. The spectrum produced will be broader.

d

Which of the following statement is NOT true of protons and electrons? A. The positive charge in an atomic nucleus is due to the protons it contains B. All protons have the same charge C. Protons and electrons have charges equal in magnitude although opposite in sign D. Protons and electrons have equal masses

a

Which of the following us TRUE when the magnetic flux through a coil at 200 turns is reduced from 1 weber to 0.5 weber in 0.5 second? a. The induced emf in the coil is 200 volts. b. The induced emf in the coil is 300 volts. c. The induced emf in the coil is 500 volts. d. The induced emf in the coil is 600 volts.

d

Which of the following will happen if a sample of gas is heated at constant temperature? a. The average kinetic energy of its molecules decreases, and the volume of the gas decreases. b. The average kinetic energy of its molecules increases, and the volume of the gas decreases. c. The average kinetic energy of its molecules decreases, and the volume of the gas increases. d. The average kinetic energy of its molecules increases, and the volume of the gas increases.

c

Which of the following will result if the number of the lines in a diffraction grating of a given width is decreased? a. The wavelengths that can be diffracted will be shorter b. The wavelengths that can be diffracted will be longer c. The spectrum produced will be narrower d. The spectrum produced will be broader

d

Which sample of water has the greatest vapour pressure? a. 50 mL at 30oC c. 150 mL at 15oC b. 100 mL at 120oC d. 75 mL at 40oC

d

Why are doorknobs placed at the edge of a door rather than at the center? a. To help give more momentum to the door b. It is closer to the edge of the doorway c. To increase the force on the door d. To increase the lever arm

a

Why is the weight of an object on the moon only 1/6 of its weight on the earth? a. the moon has significantly less mass than the earth b. because the moon is far from the earth c. gravitational force on the moon is stronger than that of the earth d. the moon orbits the earth

b

Why must a large force be applied to a bowling ball so that it can move at the same speed as the tennis ball? a. because it is bigger b. because it has more inertia c. because it has more friction d. because it has lower velocity

c

You tape two different soda straws together end-to-end to make a longer straw with no leaks. The two straws have radii of 3 millimeters and 5 millimeters, respectively. You drink a soda through your combination straw. In which straw is the speed of the liquid faster? a. Whichever one is nearest to your mouth b. The one of bigger radius c. The one of smaller radius d. Neither. The speed is the same in both straws.