Physics 101, 3rd (no, second) 2X’s quiz MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Sort # 15275, Form ID AA 03,

1. The reason a granite block is mostly empty space is that the atoms in the granite are A) in perpetual motion. B) mostly empty space themselves. C) held together by electrical forces. D) not as close together as they could be. E) invisible.
2. Which of these atoms has the greatest number of electrons? A) helium B) carbon C) iron D) gold E) uranium
3. Which has the greater density, a lake full of water or a cup full of lake water? A) the cup full of lake water. B) the lake. C) both have the same density.
4. Which has more skin compared to its body weight, an elephant or a mouse? A) elephant B) mouse C) typically, both the same
5. If the volume of an object were to double while its mass stays the same, its density would A) halve. B)  double. C)  stay the same.
6. When a boat sails from fresh water to salt water, the boat will float A) lower in the water. B) higher in the water. C) at the same water level.
7. Water pressure is greatest against the A) top of a submerged object. B) bottom of a submerged object. C) sides of a submerged object. D) is the same against all surfaces. E) none of these.
8. A suction cup sticks to a wall. It is A) pulled to the wall by the vacuum. B) pushed to the wall by the atmosphere. C) both of these. D) neither of these.
9. When water is turned on in a shower, the shower curtain moves towards the water. This has to do with A) capillary action. B) surface tension. C) heat capacity. D) pressure of a moving fluid. E) none of these.
10. When water at 4 degrees C is heated it expands. When water at 4 degrees C is cooled, it A) contracts. B) expands. C) neither contracts nor expands.
11. A temperature difference of 10 degrees Celsius is also equal to a temperature difference of 10 on the A) Fahrenheit scale. B)  Kelvin scale. C) both of these. D)  neither of these.
12. When you touch a cold piece of ice with your finger, energy flows A) from your finger to the ice. B) from the ice to your finger. C) actually, both ways.
13. Warm air rises because faster-moving molecules tend to move to regions of less A) density. B)  pressure. C)  both of these.
14. If a solid object radiates more energy than it absorbs, its A) internal energy decreases. B)  temperature decreases. C) both of these. D)  neither of these.
15. Steam burns are more damaging than burns caused by boiling water because steam A) gives up additional energy when it condenses. B) has more energy per kilogram than boiling water. C) both of these. D) neither of these.
16. The molecules in a room-temperature glass of water jostle around at A) a great variety of speeds. B) much the same rates of speed.
17. When steam condenses to water, it is a A)cooling process B)heating process C) neither causes heating nor cooling.
18. The greater the difference in temperature between the input reservoir and the output reservoir for a heat engine, the A) greater the efficiency. B) less the efficiency. C) neither, efficiency doesn't depend on temperature difference.
19. When a volume of air is compressed and no heat enters or leaves, the air temperature will A) increase. B) decrease. C) remain unchanged.
20. Consider a piece of metal that is at 10 degrees C. If it is heated until it has twice the internal energy, its temperature will be A) 20 degrees C. B) 273 degrees C. C) 293 degrees C. D) 566 degrees C. E) none of these.