Thermal Expansion

Q.

The expansion of a substance on heating is called ___ expansion.

Q.

Telephone and electric wires are left loose between two poles to prevent

1. Expansion

2. Snapping

3. Contraction

4. Both A and C

Q.

On what factors does the thermal expansion of solids depend? Explain.

Q. Explain with the help of a formula the volumetric expansion coefficient of a solid.

Q. The kink prevents the mercury level from falling down on its own in a _______ thermometer.​

1. laboratory​
2. clinical​
3. digital
4. infrared​

Q. Name Three types of Thermal expansion?

Q. Define thermal expansion for alpha, beta and gamma?

1. $\alpha :\beta :\gamma ::1:3:2$
2. $\alpha :\beta :\gamma ::3:2:1$
3. $\alpha :\beta :\gamma ::2:3:1$
4. $\alpha :\beta :\gamma ::1:2:3$

Q.

Explain the following:

(a) The telephone wires break in winter.

(b) Iron rims are heated before they are fixed on the wooden wheels.

(c) The gaps are left between the successive rails on a railway track.

(d) A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle.

(e) A cement floor is laid in small pieces with gaps in between.

Q. The SI unit for the coefficient of linear expansion is

1. ${}^{\circ }C$
2. $pe{r}^{\circ }C$
3. $c{m}^2{/}^{\circ }C$
4. none of these

Q.

Property of matter to increase in size on heating is called

1. Thermal work

2. Thermal Expansion

3. Thermal radiation

4. Thermal contraction

Q. Express $2.5\text{atm}$ in $\text{kPa}$.

Q.

Assertion (A): On opening a Pepsi bottle, CO₂ comes out with fizzing sound.

Reason (R): Solubility of a gas is inversely proportional to pressure.

1. Both A and R are true and R is the correct explanation of A..

2. Both A and R are true, but R is not the correct explanation of A.

3. A is true and R is false.

4. A is false and R is true.

Q.

Explain how the anomalous expansion of water helps in preserving aquatic life in very cold countries.

Q.

Pick the odd one out

Book, pencil, plants, heat

Q.

Why are the telephone or telegraph wires laid in summer kept slightly loose, while in winter they are tight?

Q.

What do you understand by linear expansion?

Q.

What is a bimetallic strip? What happens when it is heated? Why?

Q. Describe an experiment to demonstrate the thermal expansion of a solid.

Q. Why does a thick tumbler cracks when we pour hot water into it?

Q.

Iron becomes soft on cooling.

1. True
2. False

Q.

Why do telephone wires sag in summer?

Q. explain relation about Heat and thermal Expansion

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

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

Q. Give a use of thermal expansion of water.

Q. A metallic bar ___ on heating.

1. expands
2. bounces
3. contracts
4. vaporises

Q. what are the types of thermal expansion

Q. Define Thermal expansion

Q. What is thermal expansion?

Q.

__________ and __________ thermal expansions occur in solids.

Q. Identify the application which involves thermal expansion of liquids.

1. Thermometer
2. Bridge
3. Pendulum
4. Rail track