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Phys Heat Test Review

Total questions: 53

Worksheet time: 1hrs 4mins

Name
Class
Date
1.

Heat necessary to change the phase or state of matter of a substance is called __.

a)

internal energy

b)

latent heat

c)

kinetic energy

d)

none of the above

2.

Find the energy released by a 1 kg copper block when it is cooled from 100°C to 20°C. Given that the heat capacity of the block is 770 J/kg x°C-1.

a)

7.70x104 J

b)

8.61x104 J

c)

6.16x104 J

d)

5.02x104 J

3.

Gas is trapped in a closed container. There exists gas pressure inside the container because gas molecules

a)

move randomly.

b)

move with equal speed.

c)

collide with one another.

d)

collide constantly with the walls of container.

4.

Given that the specific latent heat of fusion of a sample is 550 kJ kg-1. Which of the following is correct?

a)

The mass of this sample is 1 kg.

b)

The energy needed to increase the temperature of 1 kg of this sample in solid state through 1oC is 550 kJ.

c)

The energy needed to increase the temperature of 1 kg of this sample in liquid state through 1oC is 550 kJ.

d)

The energy needed to change 1 kg of the material from solid state to liquid state is 550 kJ.

5.

If 5.0 x 105 J of energy is absorbed by a block of ice when it is heated from -5oC to 0oC, find the mass of the ice.

Given that the specific heat capacity of ice is 2.05 x 103 J kg-1 oC-1 and the specific latent heat of fusion of ice is 3.34 x 105 J kg-1.

a)

1.45 kg

b)

2.56 kg

c)

3.01 kg

d)

3.27 kg

6.

Latent heat is

a)

the heat absorbed or released at a boiling process during a change of phase

b)

the heat absorbed or released at a constant temperature during a change of phase

c)

the heat absorbed or released at a constant temperature during a change of phase of 1 kg object

d)

the heat absorbed or released by an object to increase or decrease its temperature by 1 degree Celcius

7.

The heat absorbed by melting a solid is known as

a)

latent heat of fusion

b)

latent heat of solid

c)

latent heat of liquid

d)

latent heat of vaporisation

8.

the symbol for specific latent heat is

a)

c

b)

ll

c)

Q

d)

m

9.

What is the formula to calculate specific latent heat of fusion?

a)

l=Qml=\frac{Q}{m}

b)

c = Q/(mΔƟ)

c)

Q = mcΔƟ

d)

Q=mlQ=ml

10.

The graph shows the cooling curve of a substance. At which stages the specific latent heat released?

a)

AB and CD

b)

BC and DE

c)

AB and EF

d)

BC and CD

11.

How much energy is required to melt down a 2000 g of mercury?(latent heat of fusion is 1.14 x  10410^4 J/kg)

a)

2.55  x 104J

b)

2.28 x 104J

c)

2,280 x 103J

d)

3.28  x 104J

12.
The graph shows the cooling curve of a substance.
The specific latent heat released at stages?
a)
CD and FG
b)
DE and EF
c)
EF and FG
d)
DE and FG
13.

Consider the following temperature-time graph when a solid is heated. which part of the graph involves latent heat of vaporization?

a)

Part I

b)

Part II

c)

Part III

d)

Part IV

14.

Water molecules have the greatest kinetic energy in

a)

Ice at 0 ⁰C

b)

Water at 90 ⁰C

c)

Water at 373 K

d)

Steam at 150 ⁰C

15.
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
16.
What is the equation to measure change in Thermal Energy?
a)
Q=mc∆t
b)
Q=mc
c)
Q= ∆mct
d)
m=QC
17.
A material was cooled from 100ºC to 40ºC.  What is the temperature change?
a)
60ºC
b)
40ºC
c)
-60ºC
d)
-40ºC
18.
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
19.
How does heat flow?
a)
Always from cold to warm
b)
Always from warm to cold
c)
Both warm to cold & cold to warm
d)
It depends on the temperature
20.

Which of the following best explains why the sand at the beach is hotter than the water?

a)

Sand has a higher specific heat than water.

b)

Sand has a lower specific heat than water.

c)

There is more water than sand at the beach.

d)

There is more sand than water at the beach.

21.
There are four cups of hot cocoa. The cup sizes are shown. The temperature of the cocoa in each cup is 25 degrees celsius. Which cup has the MOST thermal energy?
a)
Large cup (Trenta)
b)
Small cup (Tall)
c)
Venti
d)
All three are the same temperature so they have same thermal energy
22.
The specific heat(c) of copper is 0.39 J/g °C. What is the temperature change(∆t) when 100 Joules of heat(Q) is added to 20 grams?
a)
12.82 °C
b)
24.12°C
c)
351 °C
23.

Convert 20°C into °F.

a)

7.2°C

b)

32°C

c)

75.2°F

d)

°68

24.
If two objects have reached the same temperature they have reached:
a)
a melting point.
b)
a boiling point.
c)
thermal equilibrium.
d)
specific heat.
25.
A high specific heat means...
a)
It heats up quickly with energy added
b)
It requires more energy to change temperature
26.
Assuming the graph shown is for water which section shows a change of state from solid to liquid?
a)
A-B
b)
B-C
c)
C-D
d)
D-E
27.
What state will the water be in in section E-F?
a)
Solid
b)
liquid
c)
gas
d)
plasma
28.
100 degrees Celsius is equal to _______ Kelvin. 
a)
0 K
b)
273 K
c)
173 K
d)
373 K
29.

This formula is used to find the amount of heat (energy) neccesary when there's a phase change

a)

Q= (h)(ΔT)

b)

Q=(m)(L)

c)

Q=(m)(c)(ΔT)

d)

Q=(k)(A)(dT)

30.

The amount of heat required to change the phase of a substance depends on two factors which are

a)

surrounding temperature

b)

temperature change

c)

material

d)

the mass

31.

What is the formula to calculate specific latent heat of vaporization?

a)

L = Q/m

b)

c = Q/(mΔƟ)

c)

Q = mcΔƟ

d)

Q = 2mL

32.
Energy is transferred as heat between two objects of ___________ temperatures. 
a)
differing
b)
same
33.
The measure of average kinetic energy of all the particles within an object is called ____________. 
a)
temperature
b)
conduction
c)
radiation
d)
heat 
34.
What unit do you use to measure Thermal Energy?
a)
J/Kg ºC
b)
Kg
c)
ºC
d)
J
35.
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
36.
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
37.
No more energy can be removed from matter at:
a)
its freezing point
b)
0°C
c)
absolute zero
d)
273 K
38.
A 15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°C to 175°C.  Calculate the specific heat capacity of iron.    
a)
0.46 J/gxoC
b)
1.654 J/gxoC
c)
2,567,446.875 J/gxoC
39.
A high specific heat means...
a)
It heats up quickly with energy added
b)
It requires more energy to change temperature
40.

Water molecules have the greatest kinetic energy in

a)

Ice at 0 ⁰C

b)

Water at 90 ⁰C

c)

Water at 373 K

d)

Steam at 150 ⁰C

41.

Which of the following statements is correct?

a)

The unit of heat capacity is J/m x °C-1.

b)

Specific heat capacity measures the temperature variations when 1J of energy is absorbed.

c)

The unit of specific heat capacity is J/kg x °C.

d)

Specific heat capacity equals to the heat content of an object.

42.

Danny pours some 95°C water into a cup of instant noodles. The final temperature of the mixture is 85°C. If the masses of the hot water and noodles are 500 g and 150 g respectively, find the specific heat capacity of the noodles.

Give that the original temperature of the noodles is 25°C and the specific heat capacity of the water is 4200 J/kg x °C.

a)

500 J/kg x °C.

b)

1.08 x 103 J/kg x °C.

c)

2.33 x 103 J/kg x °C.

d)

6.00 x 103 J/kg x °C.

43.

In order to make a cup of milk coffee at 78°C, 200 g of coffee is mixed up with 40 g of milk. If the original temperature of the coffee is 80°C, find the original temperature of the milk. Assume that there is no heat lost to the surroundings. Given that the specific heat capacity of coffee and milk is 4000 J/kg x °C. and 3900 J/kg x °C respectively.

a)

10.3°C

b)

20.7°C

c)

45.2°C

d)

67.7°C

44.

Regarding to the fixed points in Celsius scale, which of the following is correct?

a)

The upper fixed point is the freezing point of water and the lower fixed point is the boiling point of water.

b)

The upper fixed point is the boiling point of methane and the lower fixed point is the freezing point of methane.

c)

The upper fixed point is the boiling point of water and the lower fixed point is the freezing point of ice.

d)

The upper fixed point is the melting point of ice and the lower fixed point is the freezing point of ice.

45.

Which material heats up quickest?

a)

Aluminium

b)

Concrete

c)

Diamond

d)

Glass

e)

Water

46.

What is the equation for specific heat capacity?

a)

Q=mcΔTQ=mc\Delta T

b)

Q=mcΔTQ=\frac{mc}{\Delta T}

c)

Q=ΔTmcQ=\frac{\Delta T}{mc}

d)

Q=cΔTmQ=\frac{c\Delta T}{m}

e)

Q=mΔcTQ=m\Delta cT

47.

The specific heat of platinum is 0.133 J/g°C. How much heat(Q) is released when a 10 g piece of platinum cools from 100°C to 50°C?

a)

66.5 J

b)

665 J

c)

0.0266 J

d)

0.665 J

48.
The temperature of an unknown piece of metal with a mass of 30.00 g changes from 25.0 °C to 35.0 °C when the metal absorbs 350.0 J of energy. What is the specific heat of the metal?
a)
1.17 J/g°C
b)
-1.17 J/g°C
c)
0.857 J/g°C
d)
-0.857 J/g°C
49.
What is the transfer of heat by direct contact?
a)
Convection
b)
Electromagnetic waves
c)
Radiation
d)
Conduction
50.
What is a transfer of heat energy by electromagnetic waves?
a)
Radiation
b)
Convection
c)
Conduction
d)
Heat
51.

A certian type of decorative lamp contains colored liquids. These liquids form globs that break off and rise to the top of the liquid. The globs rise due to ...

a)

Conduction

b)

Radiation

c)

Convection

52.

A college student holds the back of his hand near an iron to see if it is hot. Heat is transferred to his hand by ..

a)

Conduction

b)

Radiation

c)

Convection

53.

One end of a copper rod is placed in a flame of a Bunsen burner. Small pieces of wax placed along the rod melt a progressively larger distance from the flame. Heat is transferred through the rod by ...

a)

Conduction

b)

Radiation

c)

Convection

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