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HEEEAT

Total questions: 25

Worksheet time: 4hrs 10mins

Name
Class
Date
1.

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

a)

7.70x104 J

b)

8.61x104 J

c)

6.16x104 J

d)

5.02x104 J

2.

Which of the following statements is correct?

a)

The unit of heat capacity is J kg-1 °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-1 K-1.

d)

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

3.

When an electric heater is supplied with an electric power of 2.0 kW to heat 4.0 kg of water for 1 minute, calculate the increase in temperature of the water. Assume that the specific heat capacity of water is 4200 J kg-1 0C-1 and there is no heat loss to the surroundings.

a)

3.050C

b)

7.10C

c)

140C

d)

300C

4.

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.

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.

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.

7.

How does heat flow?

a)

block R to block S

b)

block S to block R

c)

heat does not flow between them

8.

How does heat flow?

a)

block P to block Q

b)

block Q to block P

c)

heat does not flow between them

9.
What unit do you use to measure Thermal Energy?
a)
J/Kg ºC
b)
Kg
c)
ºC
d)
J
10.

What letter is used to represent specific heat capacity?

a)

H

b)

P

c)

C

d)

T

11.
What is Specific Heat?
a)
The  amount of thermal energy required to increase the temperature of 1kg of a material by 1°C.
b)
The  amount of radiant energy required to increase the temperature of 1kgof a material by 1°C
c)
The  amount of energy required to increase the temperature of 1kgof a material by 1°C.
d)
The  amount of friction  required to increase the temperature of 1kgof a material by 1°C.
12.
A high specific heat means...
a)
It heats up quickly with energy added
b)
It requires more energy to change temperature
13.
What  is the formula to calculate heat energy required to raise the temperature of any substance?
a)
Q=mc∆t
b)
Q=mc
c)
Q= ½mv
d)
m=QC
14.
Specific heat of water is  4.18 J/g°C. Specific heat of wood is 1.760 J/g°C What material needs more heat energy to raise the temperature?
a)
Water
b)
Wood
c)
Both are same
15.
Diagram above shows milk at temperature 80oC immersed in water at temperature 10oC. Which statement is correct when milk and water eventually achieved thermal equilibrium?
a)
There is no flow of heat between milk and water.
b)
The net flow of heat between milk and water is zero.
c)
The temperature of milk and water will be the same at 10oC.
d)
The temperature of milk and water will be the same at 80oC.
16.
Diagram above shows a container of Baskin Robbin ice cream bought at the Aeon supermarket. The purchase of that ice cream comes together with few cubes of dry ice. Name the process of dry ice changing from solid to gas.
a)
Freezing
b)
Solidification
c)
Sublimation
d)
Vaporization
17.
Two cups contain coffee at 85oC and milk at 35oC respectively. The specific heat capacity of milk is 1.5 times the specific heat capacity of coffee. The mass of coffee is twice the mass of milk. If the drinks are mixed together, what is the final temperature of the mixture?
a)
63.57oC
b)
54.26oC
c)
72.34oC
d)
66.28oC
18.

In which of the following modes of heat transfer, do the molecules travel from the hotter part of the body to the colder part?

a)

Conduction

b)

Convection

c)

Radiation

d)

All of the three

19.
what is the meaning of conduction
a)
when heat transfers from objects that are not touching
b)
heat rise 
c)
cold fall
d)
when heat transfers from objects that are touching
20.
Warm air rises and the cool air sinks.
a)
conduction
b)
convection
c)
radiation
21.
What is the transfer of heat by movement of liquids or gases?
a)
conduction
b)
convection
c)
radiation
22.

The candle will slowly heat the metal and transfer the heat directly to the mans hand. This is an example of _?_.

a)

conduction

b)

convection

c)

radiation

23.

The moving of air in the image is an example of _?_.

a)

radiation

b)

convection

c)

conduction

24.
A solar oven uses what kind of heat energy to cook food?
a)
Conduction
b)
convection
c)
radiation
d)
none of the above
25.

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

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