Free Printable Thermal Energy

1.

Which statement about two objects in thermal equilibrium is true?

a)

There is no flow of energy from one object to the other.

b)

The thermal energy of the two objects is equal.

c)

The temperature of each object is the same.

d)

The rates of thermal energy transfer between the two objects is the different.

2.

Which statement is true?

a)

Each of the particles that compose an object has the same amount of energy.

b)

The kinetic energy of each of the particles in a hot object is greater than the kinetic energy of each of the particles in a cold object.

c)

On average, the kinetic energy of the particles in a hot object will be greater than that in a cold object.

d)

The greater the mass of the object, the higher is its temperature.

3.

1 kg of water at its melting point is to be frozen into ice, and then have its temperature reduced by 1 K. What is required to complete this process?

a)

Specific heat of water absorbed + latent heat of vaporization absorbed

b)

Latent heat of fusion absorbed + specific heat of ice absorbed

c)

Specific heat of water emitted + latent heat of vaporization emitted

d)

Latent heat of fusion emitted + specific heat of ice emitted

4.

Which one of the following temperatures (in $\degree C$ ) is equivalent to 294 K?

a)

$-312\ \degree C$

b)

$21\ \degree C$

c)

$39\ \degree C$

d)

$585\ \degree C$

5.

The melting point of a solid is $90\degree C$ . What is the heat required to change $2.5\ kg$ of this solid at $30\degree C$ to a liquid?
The specific heat of the material is $390\ \frac{J}{kg.K}$ , the heat of fusion is $4000\ \frac{J}{kg}$

a)

$1.0×10^4J$

b)

$4.9×10^4J$

c)

$5.9×10^4J$

d)

$6.9×10^4J$

6.

A solid is heated at a constant rate until it reaches the vapor state. The temperature of the substance changes with time as shown in the graph. Which part of the graph indicates that the substance exists in the solid – liquid state?

a)

AB

b)

BC

c)

DE

d)

EF

7.

Which is the transfer of thermal energy through direct contact of particles?

a)

Conduction

b)

Convection

c)

Convection

d)

Specific heat

8.

A $2.0kg$ block of aluminum (specific heat $=897J/kg.K$ ) is at an initial temperature of $300K$ . What will its final temperature be if $3.35×10^5J$ of thermal energy is added?

a)

$174K$

b)

$474K$

c)

$487K$

d)

$803K$

9.

Which type of change requires the least amount of energy for a $1.0kg$ of water?

a)

Melting from ice into liquid water.

b)

Changing the temperature by 1 Kelvin while in the same state.

c)

Vaporizing from liquid into a gas at the same temperature.

d)

Changing the temperature by 100 Kelvin while in the same state.

10.

Depending on the diagram in the figure for a system of a heat engine. What is the amount of $Q_A$ ?

a)

100 J

b)

200 J

c)

400 J

d)

800 J

Thermal Energy - Exam

Total questions: 10

Worksheet time: 28mins

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