Expansion of Solids

Q. Small gaps are left in between between two iron rails in railway track. Why?

1. For application of track change
2. To avoid accidents when rails expands
3. For easy braking of trains
4. So as to generate noise

Q.

What is Damping?

Q.

On what principle is the working of a thermometer based?

Q.

Thermal expansion is the property due to which, increasing the temperature of an object changes its dimensions or volume.

1. colour

2. dimensions or volume

Q.

When an object undergoes thermal expansion, its volume or dimension increases.

1. colour

2. dimensions or volume

Q.

Differentiate between thermal expansion in solids and gases.

Q. Small gaps are left between cemented roads to avoid damage due to:

1. thermal expansion of gases
2. anomalous expansion
3. thermal expansion of liquids
4. thermal expansion of solids

Q. Match the following in column A with column B
$\begin{array}{cc}\text{A}& \text{B}\\ \text{(1) Thermal expansion of solids}& \text{(P) Working of automobile engines}\\ \text{(2) Thermal expansion of liquids}& \text{(Q) Gaps kept in between rails}\\ \text{(3) Thermal expansion of gases}& \text{(R) Working of thermometer}\end{array}$

1. (1)-(Q), (2)-(P), (3)-(R)
2. (1)-(P), (2)-(Q), (3)-(R)
3. (1)-(Q), (2)-(R), (3)-(P)
4. (1)-(R), (2)-(Q), (3)-(P)

Q. During thermal expansion, what happens to the density of a substance ?

Q.

Thermal expansion

Define superficial expansion.

Q.

When an object undergoes thermal expansion, its volume or dimension increases.

1. True

2. False

Q. Write True or False for the following statement:

• A mercury thermometer makes use of the property of expansion of liquids on heating.

1. False
2. True

Q. one mole of an ideal mnoatomic gas at temperature T is heated at constant pressure till the volume is doubled and then it is allowed to expand at constant temperature till the pressure is halved . Calculate heat supplied to the gas

Q. When a bimetallic strip is heated:

1. it does not bend at all
2. it gets twisted in the form of an helix
3. it bends in the form of an arc
4. it's length increases linearly

Q. On what principle does mercury thermometer work?

1. Anomalous expansion
2. Thermal expansion of liquids
3. Thermal expansion of gases
4. Thermal expansion of solids

Q. During summer, electrical wires sag due to _______.

1. thermal expansion of solids
2. thermal expansion of liquids
3. thermal expansion of gases
4. anomalous expansion

Q.

Expansion during heating:

1. Occurs only in solids

2. Decreases the density of a material

3. Increases the weight of a material

4. Occurs at the same rate for all liquids and solids

Q. A thick glass tumbler cracks immediately when we pour hot water into it. This example is governed by which principle?

1. Thermal expansion of solids
2. Thermal expansion of liquids
3. Thermal expansion of gases
4. Anomalous expansion

Q. Automobile engines work on the principle of:

1. thermal expansion of liquids
2. thermal expansion of gases
3. anomalous expansion
4. thermal expansion of solids