practice test

Question 1

An airplane wing is designed so that the air is moving _____ over the top of the wing.

a. Faster
b. slower
c. The same speed

Answer 1

Faster

Question 2

Water is flowing from left to right in the pipe shown below. In which section of the pipe is the water pressure the highest?

a. Wide
b. Narrow

Answer 2

The wide section

Question 3

On a cold but sunny day in winter, you are warmed by the sun. By what mechanism
does this occur?
(a) Convection
(b) Conduction
(c) Radiation

Answer 3

Radiation

Question 4

First law of thermo is basically

Answer 4

conservation of energy

Question 5

Third law of thermo is basically

Answer 5

heat flows from hot to cold

Question 6

Why is it easier to unscrew a jar lid when it is placed under a stream of hot water?
(a) The hot water makes the glass jar contract, allowing it to be opened more easily.
(b) The hot water makes the pressure on the inside of the jar lower, allowing it to be
opened more easily.
(c) The hot water makes the pressure on the inside of the jar higher, allowing it to be
opened more easily.
(d) The hot water makes the jar easier to hold, allowing it to be opened more easily.
(e) The hot water makes the metal lid expand, allowing it to be removed more easily.

Answer 6

e. The hot water makes the metal lid expand, allowing it to be removed more easily.

Question 7

1m^3 = x liters

Answer 7

1000

Question 8

Boiling water is a good example of heat

(a) convection
(b) conduction
(c) condensation
(d) radiation
(e) radiative transfer

Answer 8

Convection

Question 9

The Second law of thermo is basically

Answer 9

entropy increases as molecules become less ordered, blocks of ice have lower entropy then a puddle of water does

Question 10

What happens to an object if it absorbs more radiation than it emits?

(a) Its temperature goes up
(b) Its temperature goes down
(c) Its temperature stays the same

Answer 10

temperature goes up

Question 11

18. I throw an object into two different liquids. In liquid A it sinks, and in liquid B it
    floats. Which liquid has a higher density.
    (a) Liquid A
    (b) Liquid B

Answer 11

Liquid B has a higher density

Question 12

19. Are shiny metallic objects good or poor emitters of thermal radiation?
    (a) They are poor emitters
    (b) They are good emitters

Answer 12

They are poor emitters

Question 13

23. A gas absorbs 500 J of heat energy while doing work. If the internal energy of the gas
    decreased by 1000 J in this process, how much work was performed by the gas?
    (a) 1500 J
    (b) 500 J
    (c) 100 J

Answer 13

1500 J