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Heat and Thermodynamics - SS2 Physics Past Questions and Answers - page 3

21

Which of the following materials typically expands the most when heated?

A

Wood

 

B

Steel

 

C

Aluminium

 

D

Glass

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22

When an object undergoes thermal expansion, what happens to its density?

A

It decreases

 

B

It increases

 

C

It remains constant

 

D

It depends on the material

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23

Which of the following statements is true regarding the coefficient of linear expansion (α) of a material?

A

It is always negative

 

B

It is different for every material

 

C

It depends on the temperature

 

D

It is constant for a given material

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24

Which of the following objects would experience the greatest expansion when heated by the same amount?

A

A solid metal bar

 

 

B

A hollow metal sphere

 

C

A solid wooden block

 

D

A hollow glass tube

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25

A steel rod has an original length of 2 metres. If its coefficient of linear expansion is 12 × 10-6 /°C and it is heated by 100°C, what will be its new length?

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26

A copper pipe with an original length of 5 metres is heated from 20°C to 80°C. If the coefficient of linear expansion for copper is 16 × 10^-6 /°C, what is the change in length of the pipe?

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27

A glass container has an original volume of 500 cm^3 at 25°C. If the coefficient of volume expansion for glass is 9 × 10^-6 /°C and it is heated to 75°C, what will be its new volume?

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28

A brass ring with an original diameter of 8 cm is heated from 20°C to 100°C. If the coefficient of linear expansion for brass is 19 × 10^-6 /°C, what will be its new diameter?

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29

According to the first law of thermodynamics, the change in internal energy of a system is equal to:

A

The heat added to the system minus the work done by the system.

 

B

The heat added to the system plus the work done by the system.

 

C

The heat added to the system multiplied by the work done by the system.

 

D

The heat added to the system is divided by the work done by the system.

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30

The second law of thermodynamics states that:

A

Energy cannot be created or destroyed, only transferred or transformed.

 

B

The entropy of a system always increases over time.

 

C

The temperature of a system always decreases over time.

 

D

The pressure of a system always decreases over time.

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