Physical Science Test 2

A) expansions of metals.

30) The operation of a bimetallic strip relies on differences in A) expansions of metals. B) conductivities of metals. C) heat capacities of metals.

D) location.

1) An object may have potential energy because of its A) speed. B) acceleration. C) momentum. D) location. E) none of the above

A) distance that a force acts.

Whereas impulse involves the time that a force acts, work involves the A) distance that a force acts. B) time and distance that a force acts. C) acceleration that a force produces.

C) both of these

20) The temperature of boiling water is A) 100°C. B) 212°F. C) both of these

C) both of these

21) The temperature of melting ice is A) 0°C. B) 32°F. C) both of these

A) increases.

21) When a volume of air is compressed, air temperature A) increases. B) decreases. C) neither of these

C) both of these

22) Blow on your hand with your mouth open. Then do the same with your lips puckered and you'll find A) a difference in temperatures. B) the breath from puckered lips is cooler. C) both of these D) neither of these

C) both of these

23) Absolute zero corresponds to a temperature of A) 0 K. B) -273° C. C) both of these D) none of the above

A) shrinks by 1/273.

24) When the temperature of a quantity of 0°-C air at constant pressure is lowered by 1 degree, its volume A) shrinks by 1/273. B) shrinks by 100/273. C) increases by 1/273. D) increases by 100/273.

A) from your finger to the ice.

25) When you touch a piece of ice with your finger, energy flows A) from your finger to the ice. B) from the ice to your finger. C) both of these D) none of the above

B) from the penny to your finger

26) When you touch a hot penny in the sunlight with your finger, energy flows A) from your finger to the penny. B) from the penny to your finger. C) both ways.

B) at or about 30°C.

27) The final temperature of 1 liter of 40°C water poured into 1 liter of 20°C water is A) less than 30°C. B) at or about 30°C. C) more than 30°C.

B) low specific heat capacity.

28) A substance that heats up relatively quickly has a A) high specific heat capacity. B) low specific heat capacity. C) high or low specific heat capacity.

B) silver

29) Which will cool faster when removed from a furnace? A) iron B) silver C) the same

D) work done divided by the time to do the work.

3) Power is defined as the A) force exerted divided by the time of exertion. B) force exerted multiplied by the distance moved. C) work done multiplied by the time to do the work. D) work done divided by the time to do the work. E) none of the above

A) contracts.

31) If water at 0°C slightly increases in temperature, the water A) contracts. B) expands. C) neither of these

C) radiation.

31) The form of heat transfer that doesn't depend on a medium is A) conduction. B) convection. C) radiation. D) all of the above

A) surface of bodies of water.

32) Ice tends to form at the A) surface of bodies of water. B) layer of water slightly below the surface. C) bottom of bodies of water.

A) absorb radiation relatively well.

37) Objects that radiate relatively well A) absorb radiation relatively well. B) reflect radiation relatively well. C) both of these D) neither of these

A) it remains at about the same temperature.

38) When an object absorbs as much as it radiates A) it remains at about the same temperature. B) it is a net absorber. C) it is a net radiator. D) none of the above

C) three times the usual power.

4) You do work on a cart loaded with groceries. If you do this work in one-third the usual time, you expend A) one third as much power. B) the usual power. C) three times the usual power. D) need more information.

D) the bottom.

7) A ball rolling down an incline has its maximum kinetic energy at A) the top. B) half-way down. C) three-quarters of the way down. D) the bottom.

B) distance moved.

9) When a simple machine multiplies force, it decreases A) potential energy. B) distance moved. C) both of these D) none of the above

A) 10%.

10) A machine puts out 100 W of power for every 1000 W put into it. The efficiency of the machine is A) 10%. B) 50%. C) 90%. D) 110%. E) none of the above

B) force and area.

12) The concept of pressure involves both A) force and volume. B) force and area. C) area and volume.

B) 100 tons

13) What is the weight of water displaced by a 100-ton floating ship? A) less than 100 tons B) 100 tons C) more than 100 tons D) 100 cubic meters E) depends on the ship's shape

D) pressure against its bottom is greater than pressure against its top.

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

B) conduct poorly.

15) In terms of transferring heat, red-hot wooden coals A) conduct quite well. B) conduct poorly. C) radiate poorly. D) convect poorly.

A) is one third.

15) When gas in a container expands to three times its volume at constant temperature, the gas pressure A) is one third. B) is one ninth. C) triples. D) remains the same.

C) both of the above

16) The air in your cousin's room has A) mass. B) weight. C) both of the above D) none of the above

B) low conductivity of the coals.

16) The reason you can walk barefoot on red-hot coals of wood without burning your feet mainly involves A) low temperature of the coals. B) low conductivity of the coals. C) mind over matter techniques.

A) undiminished to all points in the fluid.

17) A change in pressure at any point in a confined fluid at rest is transmitted A) undiminished to all points in the fluid. B) to points of lower pressure. C) in the direction of lower energies. D) all of the above E) none of the above

D) fluids.

17) Energy transfer by convection is primarily restricted to A) solids. B) liquids. C) gases. D) fluids. E) none of the above

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

18) When an object is partly or wholly immersed in a liquid, it is buoyed up A) by a force equal to its own weight. B) by a force equal to the weight of liquid displaced. C) and floats in accord with Archimedes' principle. D) all of the above E) none of the above

A) translational.

19) The motion of atoms and molecules that most affects temperature is A) translational. B) rotational. C) vibrational. D) none of the above

A) on the wall.

2) If you push for an hour against a stationary wall, you do no work A) on the wall. B) at all. C) both D) none of the above

D) all of the above

2) The amount of potential energy possessed by an elevated object is A) relative to a chosen reference level. B) equal to the work done in lifting it. C) equal to the kinetic energy it will acquire when freely falling to its reference level. D) all of the above

B) cool.

20) If a volume of air is warmed, it expands and tends to A) warm. B) cool. C) neither of these

C) twice.

If you do work on an object in half the time, your power output is A) half. B) the same. C) twice.