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Test 2 – Version 1
1. How many different elements are in a N2 molecule?
a. One
b. Two
c. Three
d. Four
2. Which of these atoms have the most mass?
a. Hydrogen
b. Lead
c. Uranium
d. They all have the same mass
3. Brownian motion has to do with the
a. Size of atoms
b. Atomic vibrations
c. First direct measurement of atomic motion
d. Random motions of atoms and molecules
4. If two protons are removed from a Nitrogen nucleus, the results is:
a. Nitrogen
b. Boron
c. Helium
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d. Neon
5. The air in this room has:
a. Mass
b. Temperature
c. Weight
d. All of these
6. In our part of the universe, antimatter is:
a. Non-existant
b. Plentiful
c. Short-lived
d. Long-lived
7. The volume of matter comes mostly from its:
a. Protons
b. Electrons
c. Neutrons
d. Positrons (anti-electrons)
8. Which of the following are electrically neutral?
a. Proton
b. Neutron
c. Electron
d. Plasma
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9. Which of the following is NOT a mixture?
a. Cake
b. Water
c. Beach Sand
d. Air
10. If one neutron is added to a oxygen nucleus, the result is:
a. Hydrogen
b. Boron
c. Oxygen
d. Helium
11. If a loaf of bread is compressed, its
a. surface tension becomes less.
b. molecules become harder.
c. density decreases
d. density increases.
12. If the volume of an object were to triple while its mass stays the same, its density would
a. become one third
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b. triple
c. stay the same
d. become four times as great
13. When weight is applied to the top of a stone arch, all of the stone blocks in the arch undergo
a. tension
b. compression
c. expansion
d. change of phase
14. When a load is placed on the middle of a horizontal beam supported at each end, the top part of the beam
undergoes
a. tension
b. compression
c. none of the above
d. all of the above
15. A strong spring is stretched 10 cm by a suspended weight. If the weight is tripled, the spring will stretch
a. no more.
b. another 5 cm, making the total stretch 15 cm.
c. another 10 cm, making the total stretch 20 cm.
d. another 20 cm, making the total stretch 30 cm.
16. You wish to bolt a sign to a horizontal I-beam supporting a bridge. You will weaken the beam least if you drill the
bolt-holes through the
a. upper flange
b. lower flange
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c. web
d. All these will have the same effect
17. A kilogram of peaches have more skin area than a kilogram of
a. Blueberries
b. Grapefruits
c. Grapes
d. Each has the same skin area
18. A dam is thicker at the bottom than at the top partly because
a. water is denser at deeper levels.
b. water pressure is greater with increasing depth.
c. surface tension exists only on the surface of liquids.
d. it looks better.
19. Ice cubes submerged at the bottom of a liquid indicate that the liquid
a. produces no buoyant force on the ice.
b. has dissolved air.
c. is warmer than the ice.
d. is not displaced by the submerged ice.
e. is less dense than ice.
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20. The pascal is a pressure unit equal to one
a. newton per square meter.
b. kilogram per square meter
c. newton per square centimeter.
d. kilogram per square centimeter.
21. In a hydraulic press operation, it is impossible for the
a. output displacement to exceed the input displacement
b. force output to exceed the force input
c. energy output to exceed the energy input
d. output piston's speed to exceed the input piston's speed
e. none of these
22. The faster a fluid moves, the
a. greater its internal pressure
b. less its internal pressure
c. internal pressure is unaffected
23. Atmospheric molecules do not fly off into outer space because of
a. their relatively high speeds
b. their relatively low densities
c. Earth's gravity
d. cohesive forces
24. A plasma differs from a gas in that
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a. its molecules are farther apart
b. it is hotter than a gas
c. it is electrically conducting
d. its atoms are boosted to higher atomic numbers
e. all of these
25. 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
26. In drinking soda or a water through a straw, we make use of
a. capillary action
b. surface tension
c. atmospheric pressure
d. Bernoulli's principle
e. none of these
27. The weight of a 2 square meter column of air that extends from sea level to the top of the atmosphere is (Hint:
Sea level atmospheric pressure is 101 kilopascals. Think about the definition of a pascal)
a. 202 N
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b. 20,200 N
c. 202,000 N
d. 202,000,000 N
28. What is the weight of water displaced by a 150 ton floating ship?
a. Less than a 150 tons
b. 150 tons
c. more than 150 tons
d. 150 cubic meters
e. depends on the shape of the ship
29. The volume of water displaced by a floating 20-ton boat
a. is 20 cubic meters
b. is the volume of 20 tons of water
c. is the volume of the boat
d. depends on the shape of the ship's hull
e. none of these
30. As a helium filled balloon rises in the air, it becomes
a. bigger
b. more dense
c. heavier
d. all of these
e. none of these
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31. If air were a better conductor than it is, at nighttime the earth would be
a. considerably colder
b. considerably warmer
c. not appreciably different in temperature
32. 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
33. Substances absorb heat energy by the process of
a. conduction
b. convection
c. radiation
d. all of these
34. Energy transfer by convection is primarily restricted to
a. solids
b. liquids
c. gases
d. fluids
e. none of these
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35. If you stake out a piece of land with a steel tape on a very cold day, the actual amount of land you will have will
be
a. smaller than measured
b. larger than measured
c. the value you measured
d. none of the above
36. Metals are both good heat conductors and good electrical conductors because of the
a. similarity between thermal and electrical conductive properties
b. looseness of the outer electrons in metal atoms
c. relatively high densities of metals
d. high elasticity of metals
e. ability of metals to transfer energy easily
37. The moderate temperature of islands throughout the world has much to do with water's
a. poor conductivity
b. vast supply of internal energy
c. high specific heat
d. high evaporation rate
e. absorption of solar energy
38. Your feet feel warmer on a rug than on a tile floor because a rug
a. is usually warmer than tile
b. is a better insulator than tile
c. for the same mass has more internal energy than tile
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d. all of these
e. none of these
39. If the specific heat of water were lower than it is, ponds in the cold of winter would be
a. more likely to freeze
b. less likely to freeze
c. neither more likely or less likely to freeze
40. The fact that desert sand is very hot in the day and very cold at night is evidence that sand has
a. a low specific heat
b. a high specific heat
c. no specific heat
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