Physics 1310 Group Exam

The lift on an airplane wing is an application of A) Bernoulli's Principle B) Archimedes' Principle C) Pascal's Principal D) Torricelli's equation

A) Bernoulli's Principle

When water freezes, it expands. What does this say about the density of ice compared with the density of water? A) Ice is less dense than water because it has more volume for the same mass. B) The density of water and ice are identical since they have exactly the same chemical formula. C) Ice is more dense than water because it has more volume for the same mass D) The expansion of water when it freezes to ice changes its volume, not its density.

A) Ice is less dense than water because it has more volume for the same mass.

In the figure, the principle underlying the operation of this device is that A) different metals have different thermal expansion coefficients. B) different metals have different latent heats. C) different metals have different thermal conductivities. D) heat always flows from hot to cold, never from cold to hot.

A) different metals have different thermal expansion coefficients.

When a liquid freezes A) heat energy leaves the substance B) heat energy enters the substance C) the temperature of the substance increases D) the temperature of the substance decreases

A) heat energy leaves the substance

What is the term for the heat required to convert a solid to a liquid at its melting point? A) heat of fusion B) specific heat C) heat of vaporization D) heat of crystallization E) none of the above

A) heat of fusion

A block of Styrofoam floats on water while a same size block of lead lies submerged in the water. The buoyant force is greatest on the A) lead. B) Styrofoam. C) is the same for both

A) lead.

Pressure is A) proportional to force and inversely proportional to area. B) proportional only to area. C) inversely proportional to both force and area. D) inversely proportional to force and proportional to area.

A) proportional to force and inversely proportional to area.

Steam burns can be much more severe than burns caused by boiling water. The reason for this is that A) steam delivers more energy to the skin than boiling water does. B) steam immediately penetrates the skin and then burns from the inside out. C) steam can go through the clothes. D) all of the above

A) steam delivers more energy to the skin than boiling water does.

A 10-kg piece of aluminum sits at the bottom of a lake, right next to a 10-kg piece of lead, which is much denser than aluminum. Which one has the greater buoyant force on it? A) the aluminum B) Both have the same buoyant force. C) It cannot be determined without knowing their volumes. D) the lead

A) the aluminum

Which of the following expands most when the temperature is lowered? Equal volumes of A) water at 4°C. B) wood. C) helium. D) iron. E) None expand when the temperature is lowered.

A) water at 4°C.

The upward pressure on the bottom surface of a submerged object is less than the downward pressure on its top surface. A) True B) False

B) False

Which of the following is NOT a unit of pressure? A) inches of mercury B) N-m2 C) atmosphere D) Pascal

B) N-m2

An umbrella tends to move upwards on a windy day principally because A) air gets trapped under the umbrella, warms, and rises. B) air pressure is reduced over the curved top surface. C) all of these D) buoyancy increases with increasing wind speed.

B) air pressure is reduced over the curved top surface.

The ratio of output force to input force of a hydraulic press will be equal to the ratio of the output and input piston A) diameters B) areas C) radii D) all of these

B) areas

Phase changes occur A) as the temperature increases. B) as the temperature remains the same. C) as the temperature decreases. D) all of the above

B) as the temperature remains the same.

Consider a brick that is totally immersed in water, with the long edge of the brick vertical. The pressure on the brick is A) the same on all surfaces of the brick. B) greatest on the bottom of the brick. C) greatest on the sides of the brick. D) greatest on the face with largest area.

B) greatest on the bottom of the brick.

The temperature at which water freezes is the same as the temperature at which A) water boils in a pressure cooker. B) ice melts C) both of these D) neither of these

B) ice melts

In a vacuum a marshmallow becomes A) smaller. B) larger. C) a hollow shell. D) flat.

B) larger.

The faster a fluid moves, the A) internal pressure is unaffected. B) less its internal pressure. C) greater its internal pressure.

B) less its internal pressure.

Salt water is more dense than fresh water. A ship floats in both fresh water and salt water. Compared to the fresh water, the volume of water displaced in the salt water is A) the same. B) less. C) more. D) Cannot be determined from the information given.

B) less.

What is the term for a change of state from a solid to a liquid? A) condensing B) melting C) vaporizing D) freezing

B) melting

If you wanted to know how much the temperature of a particular piece of material would rise when a known amount of heat was added to it, which of the following would be most helpful to know? A) density B) specific heat C) thermal conductivity D) initial temperature

B) specific heat

As a high-altitude ballon sinks lower into the atmosphere, it undergoes a decrease in A) density B) volume C) mass D) weight

B) volume

A balloon is buoyed up with a force equal to the A) atmospheric pressure. B) weight of air it displaces. C) density of surrounding air. D) weight of the balloon and contents.

B) weight of air it displaces.

The pressure differential across a wing cross section due to the difference in air flow is explained by A) Archimedes Principle. B) Torricelliʹs law. C) Bernoulliʹs equation. D) Poiseuilleʹs law.

C) Bernoulliʹs equation.

ʺAn external pressure applied to an enclosed fluid is transmitted unchanged to every point within the fluidʺ is known as A) Archimedesʹ principle B) Bernoulliʹs principle C) Pascalʹs principle D) Fermetʹs principle

C) Pascalʹs principle

The hydraulic lift is an application of A) Archimedesʹ principle. B) Poiseuilleʹs equation. C) Pascalʹs principle. D) Bernoulliʹs principle.

C) Pascalʹs principle.

It is a well‐known fact that water has a higher specific heat than iron. Now, consider equal masses of water and iron that are initially in thermal equilibrium. The same amount of heat, 30 calories, is added to each one. Which statement is true? A) They are no longer in thermal equilibrium; the water is warmer. B) They remain in thermal equilibrium. C) They are no longer in thermal equilibrium; the iron is warmer. D) It is impossible to say without knowing the exact mass involved.

C) They are no longer in thermal equilibrium; the iron is warmer.

When an object is partly or wholly immersed in a liquid, it is buoyed up A) but nevertheless sinks. B) and floats because of Archimedes principle. C) by a force equal to the weight of liquid displaced. D) by a force equal to its own weight.

C) by a force equal to the weight of liquid displaced.

The type of heat transfer that occurs between a stove and a pot placed on it is A) countercurrent B) evaporation C) conductive D) convective

C) conductive

An air bubble is formed at the bottom of a lake, and begins rising toward the surface. The air is hotter than the water. If the temperature of the air remains constant as the bubble rises, the volume of the bubble will A) decrease. B) remain constant C) increase.

C) increase.

One day, while swimming below the surface of the ocean, you let out a number of bubbles of air from your mouth. As the bubbles rise toward the surface, their diameters will A) stay the same. B) decrease. C) increase. D) increase for half of the bubbles and decrease for the other half.

C) increase.

Salt water is denser than fresh water. A ship floats in both water and salt water. Compared to the fresh water, the volume of water displaced in the salt water is A) more B) the same C) less D) cannot be determined because we do not know the volume of the ship

C) less

A thermally isolated system is made up of a hot piece of aluminum and a cold piece of copper, with the aluminum and the copper in thermal contact. The specific heat capacity of aluminum is more than double that of copper. Which object experiences the greater magnitude gain or loss of heat during the time the system takes to reach thermal equilibrium? A) the aluminum B) the copper C) Neither one; both of them experience the same size gain or loss of heat. D) It is impossible to tell without knowing the masses. E) It is impossible to tell without knowing the volumes.

C) neither one; both of them experience the same size gain or loss of heat

The pascal is a pressure unit equal to one A) kilogram per square meter. B) kilogram per square centimeter. C) newton per square meter. D) square meter per newton.

C) newton per square meter.

The type of heat transfer that occurs between a heating lamp and the food that it is keeping warm is A) evaporation. B) conductive. C) radiative. D) countercurrent.

C) radiative.

What is the term for the amount of energy required to raise one gram of any substance one degree on the Celsius scale? A) heat B) joule C) specific heat D) calorie E) none of the above

C) specific heat

What is the term for a direct change of state from a solid to a gas? A) deposition B) condensation C) sublimation D) vaporization

C) sublimation

When you blow some air above a paper strip, the paper rises. This is because A) the air above the paper moves faster and the pressure remains constant. B) the air above the paper moves slower and the pressure is lower. C) the air above the paper moves faster and the pressure is lower. D) the air above the paper moves slower and the pressure is higher.

C) the air above the paper moves faster and the pressure is lower

A dam is thicker at the bottom than at the top partly because A) water is denser at deeper levels. B) surface tension exists only on the surface of liquids C) water pressure is greater with increasing depth. D) it looks better.

C) water pressure is greater with increasing depth.

Salt water has greater density than fresh water. A boat floats in both fresh water and in salt water. Where is the buoyant force greater on the boat? A) in salt water B) in fresh water C) The buoyant force is the same in both cases.

C)The buoyant force is the same in both cases.

As a rock sinks deeper and deeper into water of constant density, what happens to the buoyant force on it if it started above the surface of the water? A) The buoyant force keeps increasing steadily B) The buoyant force steadily decreases. C) The buoyant force remains constant. D) The buoyant force first increases and then remains constant.

D) The buoyant force first increases and then remains constant.

As shown in the figure, fluid fills a container having several sections. At which of the indicated points is the pressure greatest? A) A B) B C) C D) The pressure is the same at each of the labeled points.

D) The pressure is the same at each of the labeled points.

Consider a flat steel plate with a hole through its center as shown in the figure. When the temperature of the plate is increased, the hole will A) expand only if it takes up more than half the plateʹs surface area. B) always contract as the plate expands into it. C) remain the same size as the plate expands around it. D) always expand with the plate. E) contract if it takes up less than half the plateʹs surface area.

D) always expand with the plate.

As shown in the figure, a bimetallic strip, consisting of metal G on the top and metal H on the bottom, is rigidly attached to a wall at the left. The coefficient of linear thermal expansion for metal G is greater than that of metal H. If the strip is uniformly heated, it will A) curve upward. B) remain horizontal, but get shorter. C) remain horizontal, but get longer. D) curve downward. E) bend in the middle.

D) curve downward.

The addition of salt to water affects its A) viscosity. B) crystal composition. C) liquidity. D) freezing point.

D) freezing point.

When a solid melts A) the temperature of the substance decreases B) heat energy leaves the substance C) the temperature of the substance increases D) heat energy enters the substance

D) heat energy enters the substance

The heat required to change a substance from the liquid to the vapor state is referred to as the A) heat of melting. B) heat of condensation. C) heat of fusion. D) heat of vaporization.

D) heat of vaporization

If the temperature of an iron sphere is increased A) its density will remain unchanged. B) its volume will decrease. C) its density will increase. D) its density will decrease.

D) its density will decrease.

When you blow some air above a paper strip, the paper rises. This happens because A) the air above the paper moves slower and the pressure is higher. B) the air above the paper moves slower and the pressure is lower. C) the air above the paper moves faster and the pressure is higher. D) the air above the paper moves faster and the pressure is lower.

D) the air above the paper moves faster and the pressure is lower.

When you touch a piece of ice, A) work flows from your hand to the ice B) thermal energy flows from the ice to your hand C) work flows from the ice to your hand D) thermal energy flows from your hand to the ice

D) thermal energy flows from your hand to the ice

The reason that buoyant force acts upward on a submerged object is that A) if it acted downward, nothing would float. B) the weight of fluid displaced reacts with an upward force. C) it acts in a direction to oppose gravity. D) upward pressure against the bottom is greater than downward pressure against the top of the submerged object.

D) upward pressure against the bottom is greater than downward pressure against the top of the submerged object.

A heating curve illustrates A) what a substance looks like as it is heated B) the chemical changes that occur as the substance is heated C) what happens to the particles of a substance as it is heated D) what happens to the heat applied as the temperature is increased E) the changes in the temperature and physical state of a substance as it is heated

E) the changes in the temperature and physical state of a substance as it is heated

To melt ice, add A) time B) temperature C) force D) energy

d) energy