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Physics Unit 9 - Thermal Physics

Total questions: 25

Worksheet time: 23mins

Name
Class
Date
1.

All materials have minimum internal energy at

a)

Absolute zero

b)

Zero degree Celcius

c)

Zero degree Farahiet

d)

100 K

2.

If there is no transfer of energy between two objects then their Temperature is

a)

Same

b)

Different

c)

Zero

d)

Infinite

3.
Temperature is a measure of the...
a)
total energy in a substance
b)
total kinetic energy in a substance
c)
average potential energy in a substance
d)
average kinetic energy of molecules in a substance
4.
If two objects have different temperatures, heat will flow from the warmer object to the cooler one UNTIL ____________
a)
one reaches a temperature of zero
b)
they both have an equal temperature
c)
one runs out of energy
5.

The SI unit for measuring heat is the

a)

Pascal

b)

Kelvin

c)

Joule

d)

Calorie

6.

When one end of a cold metal spoon is placed upright in a cup of hot coffee, the other end gets hotter. Which one of the following best describes what is happening?

a)

Warmer molecules will rise to the top.

b)

The hot molecules produce thermal radiation that is then absorbed by the colder molecules.

c)

Higher-energy molecules hit lower-energy molecules, increasing their speed and therefore their temperature.

d)

Lower-energy molecules hit higher-energy molecules and the friction increases their temperature.

7.
Heat transfer occurs:
a)
in many directions
b)
both from warm objects to colder ones and from cold objects to warmer ones
c)
only from warm objects to colder ones
d)
only from cold objects to warmer ones
8.

Which type of heat transfer is shown?

a)

convection

b)

conduction

c)

radiation

d)

stir frying

9.

You are sitting 2 m away from this camp fire and you feel your body absorbing thermal energy from the fire. What type of heat transfer are you experiencing?

a)

convection

b)

conduction

c)

radiation

d)

bonfire

10.

What type of heat transfer is occurring inside the liquid water shown in this picture?

a)

convection

b)

conduction

c)

radiation

d)

boiling water

11.
When holding a cup of ice water, your warm hand becomes cold. How does the heat transfer?
a)
From the cold cup to your hand
b)
From the cold cup to the warm air
c)
From the ice to your hand
d)
From your warm hand to the cold cup.
12.
Why do you want to live in a home with good insulation during the cold winter months?
a)
The insulation will keep you cool during winter.
b)
If there is good insulation, the thermal energy will not be able to move easily from inside the warm home to the cool areas outside the building.
c)
If there is not good insulation, the air inside the home will become too hot.
d)
A house with good insulation will keep the warm air in the attic.
13.
Conductors are materials that...
a)
Allow heat to pass through
b)
Stop heat from passing through
c)
Allow cold to pass through
d)
Stop cold from passing through
14.
The amount of energy required to raise the temperature 1ºC for every kilogram is called____?
a)
Thermal Energy
b)
Specific Heat
c)
Temperature
d)
Kinetic Energy
15.
Water has a specific heat of 4184 J/KgºC.  Wood has a specific heat of 1760 J/KgºC.  What material needs more energy to raise the temperature 1ºC
a)
Wood
b)
Water
c)
Both are the same
16.
Copper, Stainless Steel, Carbon Steel, and Zinc were all heated using the same thermal energy.  What material would be the coolest after being heated?
a)
Copper
b)
Carbon Steel
c)
Zinc
d)
Stainless Steel
17.

The specific heat of platinum is 133 J/kgK. How much heat is released when a 0.0255 kg piece of platinum cools from 100.0°C to 30.0°C? Your answer must include correct units and significant digits.

(a)  

18.

0.020 kg of water is placed in a jar and left standing. Since the water temperature changes from 25.0°C to 20.0°C, how much heat energy moves from the water to the surroundings? The specific heat of liquid water is 4180 J/kgK. Your answer must include correct units and significant digits.

(a)  

19.

Select the state changes that latent heat of fusion applies to.

a)

melting

b)

evaporating

c)

freezing

d)

condensing

e)

sublimation

20.

Select the state changes that latent heat of vaporisation applies to.

a)

melting

b)

evaporating

c)

freezing

d)

condensing

e)

sublimation

21.

The diagram shows a heating curve for ice. Which line represents the ice melting?

a)

A

b)

B

c)

C

d)

D

e)

E

22.

Why are lines B and D flat?

a)

The ice is melting

b)

The ice is freezing

c)

All of the thermal energy is used to break the bonds

d)

They stopped the stopwatch

e)

They stopped heating the ice.

23.

The diagram shows a cooling curve for ice. Which line represents the ice in a liquid state (water)?

a)

A

b)

B

c)

C

d)

D

e)

E

24.

The diagram shows a cooling curve for ice. Which line represents the ice freezing?

a)

A

b)

B

c)

C

d)

D

e)

E

25.

The diagram shows a cooling curve for ice. Which line represents the ice in a solid form?

a)

A

b)

B

c)

C

d)

D

e)

E

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