1. The water cooling system in a car engine that carries hot water from the engine block to the radiator is an example of cooling by:
- conduction.
- convection.
- radiation.
- transfer.
2. The operation of a simple thermostat depends on:
- the mechanical equivalent of heat.
- specific heat.
- thermal expansion.
- heat of fusion.
3. An ideal gas is heated. If the gas is in a container that prevents its volume from changing, what happens to the pressure?
- It decreases.
- It stays constant.
- It increases.
- This can't be answered without more information.
4. Which of the following is the coldest temperature?
- 356 K
- 201 ºF
- 91 ºC
- 652 ºR
5. Radio waves of wavelength 3 cm have a frequency of:
- 1 MHz.
- 9 MHz.
- 100 MHz.
- 10,000 MHz.
6. J. J. Thompson's measurement of e/m for the electron provides evidence for the:
- wave nature of matter.
- particle nature of matter.
- wave nature of radiation.
- particle nature of radiation.
7. In a photoelectric effect experiment at a frequency above cutoff, the stopping potential is proportional to
- the energy of the least energetic electron before it is ejected.
- the energy of the least energetic electron after it is ejected.
- the energy of the most energetic electron before it is ejected.
- the energy of the most energetic electron after it is ejected.
8. The magnetic field B inside a long ideal solenoid is independent of
- the cross-sectional area of the solenoid.
- the current.
- the core material.
- the spacing of the windings.
9. Helmholtz coils (solenoids) are commonly used in the laboratory (as in the e/m experiment), because the magnetic field between the coils
- can be varied more easily than the fields of other current arrangements.
- is especially strong.
- nearly cancels the earth's magnetic field.
- is nearly uniform.
10. When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage
- stays the same.
- decreases.
- increases.
- depends on the material.
11. When there is current through a wire placed in a magnetic field
- the wire will overheat.
- the wire will become magnetized.
- a force is exerted on the wire.
- the magnetic field will be cancelled.
12. The charge on a glass rod which has been rubbed with silk is called positive
- by established convention.
- so that the proton charge will be positive.
- to conform to the conventions adopted for G and m in Newton's law of gravitation.
- because glass is an insulator.
13. At any point, the magnetic field lines are in the direction of
- the magnetic force on a moving positive charge.
- the magnetic force on a moving negative charge.
- the velocity of a moving negative charge.
- None of the above