Real and Apparent Expansion of Liquids

Q.

The real expansion of a liquid is always _________.

1. more than the apparent expansion.

2. less than the apparent expansion.

3. equal to the apparent expansion.

4. twice the apparent expansion.

Q.

Give Reason:

Medicine bottles always have some empty space.

Q. The meniscus is _______ when there is an upward depression and it is _____ when there is an outward bulging.

1. Concave, Convex
2. Convex, Convex
3. Convex, Concave
4. Concave, Concave

Q.

Compare the thermal expansion in solids, liquids and gases and explain the differences with reason.

Q.

When fluids are heated, the molecules closer to the source get heated and expand.

1. True
2. False

Q.

Intermediate state of apparent expansion of ___cannot be observed.

1. plasma

2. liquids

3. solids

4. gases

Q. Two cylinders of same cross-section and length $L$ but made of two material of densities $d_1$ and $d_2$ are cemented together to form a cylinder of length $2L$. The combination floats in a liquid of density $d$ with a length $L/2$ above the surface of the liquid. If $d_1>d_2$ then

1. $d_1>\frac{3}{4}d$
2. $\frac{d}{2}>d_1$
3. $d<d_1$
4. $\frac{d}{4}>d_1$

Q.

why does the surface tension of the water decrease on addition of detergent ?

Q.

The pressure of $2L$ of $O_2$ gas is doubled when its temperature is increased from 300 K to 600 K. Find the final volume of the gas.

1. 4 litres

2. 20 litres

3. 40 litres

4. 2 litres

Q. The meniscus is _______ when there is an upward depression and it is _____ when there is an outward bulging.

1. Concave, Convex
2. Concave, Concave
3. Convex, Concave
4. Convex, Convex

Q. Choose the correct statement.​ The change in volume of $0.2{\text{m}}^3$ of glycerine, $\gamma =49\times 10{}^{-5}$ ${}^{\circ }{\text{C}}^{-1}$ if its temperature is increased by $30{}^{\circ }\text{C}$ is $2.94\times {10}^{-3}{\text{m}}^3$. ​ When the liquid is heated, there is a considerable rise in its density.​

1. Both statements are incorrect​
2. Only statement 2 is correct​
3. Both statements are correct​
4. Only statement 1 is correct​

Q.

Liquids experience

1. only superficial expansion

2. only cubical expansion

3. linear, surface and volume expansion

4. only linear expansion

Q. Find the coefficient of cubical expansion of the rod.

1. 2.6
2. 5.2
3. 7.8
4. 10.4

Q.

Alcohol and water have same rate of expansion.

1. False

2. True

Q.

Liquids experience

1. only cubical expansion

2. only superficial expansion

3. only linear expansion

4. linear, surface and volume expansion

Q. Four identical conical flasks A, B, C & D each are filled with 500 ml of water. The flasks A, B, C & D are heated till the water attain temperatures of $45{}^{\circ }C,55{}^{\circ }C,65{}^{\circ }C$ and $85{}^{\circ }C$ respectively. Which of the following flasks, contain the highest water level?

1. Flask A
2. Flask B
3. Flask D
4. Flask C