Physics – Class 11 Practice Test 8

1. What will be the terminal velocity of a rain drop of radius (r) 1mm and mass (M) 0.001g falling through air. The coefficient of viscosity of air (η) is 1.8 X 10^-5Ns/m²? Neglect buoyant force.

40 m/s

20 m/s

29.47 m/s

35.8 m/s

2. Velocity has to be the same at the same horizontal level in case of steady laminar flow.

True

False

3. On which of these following options is the continuity equation based?

Conservation of momentum

Law of conservation of energy

Conservation of mass

Work energy theorem

4. What is the relation between molar heat capacities of the two processes given in the diagram below? Assume process acb has a heat capacity of C₁ and process adb has a heat capacity of C₂.

C₁ = C₁/ Area inside curve

C₁ = C₂

C₁ > C₂

C₂ > C₁

5. Select the correct statement for melting of any substance.

It is exothermic in nature

It occurs at 100°C

It occurs at the same temperature as that of vapourization

It requires heat to be supplied to the substance

6. If we supply equal amounts of heat to equal masses of two different substances, the rise in temperature will be the same for both. True or False?

True

False

7. The contact angle determines whether liquid will rise or get depressed along a solid surface. Select the correct statement regarding the same.

If contact angle is found to be greater than 90°, then liquid will have depressed along the solid surface

Liquid always gets depressed along solid surface, irrespective of contact angle

Liquid always rises along solid surface, irrespective of contact angle

If contact angle is found to be less than 90°, the liquid will have raise along the solid surface

8. Consider two lines on the surface of water kept in a beaker. The length of one line is twice the others. A force will be acting on the lines from either side. What is the ratio of magnitude of F1 & F2?

1:2

1:1

2:1

2:3

9. What is the value of coefficient of volume expansion for an ideal gas?

(ΔV/V)/Δ T

2*coefficient of linear expansion

(V/ΔV)/ Δ T

1/3 * coefficient of linear expansion

10. What is the unit of coefficient of viscosity?

Ns/m²

Nm/s

Nm/s²

Ns/m