Question

1. A heat engine operates by taking in heat at a particular temperature and

a. converting it all into work
b. exhausting some of it at a higher temperature
c. exhausting all of it at a lower temperature
d. converting some into work and exhausting the rest at a lower temperature

2. A refrigerator

a. adds cold to a substance
b. transfer heat from one location to another
c. changes heat to cold
d. removes cold from a substance

3. The maximum efficiency of a heat engine

a. can sometimes reach 100%
b. is always much less than 100%
c. depends primarily upon the fuel used
d. is usually approximately 5%

4. A heat engine absorbs heat at 227 degree C and exhausts at 27 degree C. Its maximum efficiency is

a. 40%
b. 200%
c. 100%
d. approx 90%

5. The charge on a proton is

a. +1.60 x 10 to the power -19 Coulombs
b. +1.60 x 10 to the power +19 Coulombs
c. -1.60 x 10 to the power -19 Coulombs
d. +1 Coulomb

6. A positive electric charge

a. attracts other positive charges
b. applies forces to all charges
c. repels negative charges
d. is repelled by neutrons

7. Coulomb's Law for the force between electric charges belong in the general category as

a. Newton's Laws of Motion
b. Newton's Laws of Gravitation
c. the laws of thermodynamics
d. the laws of conservation of energy

8. An atom in its naturally occurring neutral state

a. contains only neutral particles
b. contains positive and negative particles
c. can acquire a positive charge by gaining electrons
d. would become negatively charged if it absorbed a neutron

9. The unit of electrical resistance is the

a. volt
b. watt
c. ampere
d. ohm

10. The resistance of a light bulb that draws a current of 4 A when connected to a 24 V battery is

a. 24 ohms
b. 6 ohms
c. 2 ohms
d. 1.67 ohms

11. The current in an 80 W 120 V electric light bulb is

a. 4800 A
b. 80 A
c. 3 A
d. 2/3 A

12. The electric force between a proton and an electron

a. doubles if the distance between them is doubled
b. is halved if the distance between them is doubled
c. becomes 1/4 the original value if the distance is doubled
d. is a constant quantity independent of position

13. All magnetic fields originate in

a. moving electric charges
b. iron atoms
c. stationary electric charges
d. permanent magnets

14. A magnetized object

a. never attracts an electrically charged body
b. always attracts a bar magnet
c. always attracts positively charged objects
d. can be created by sending an electric current through a coil of wire

15. Electrical resistance is due to

a. the motion of electrons in a wire
b. connecting a battery to a resistor
c. collisions between electrons and fixed atoms
d. collisions between electrons and protons in the nucleus

Answer 1

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