Physics

1. IF two soap bubbles of different radii are in communication with each other:

The sizes of the bubbles remain unchanged

Air flows from the larger into the smaller bubble until the radius of the smaller one becomes equal to that of the larger one

Air flows from the larger bubble into the smaller one until the two bubbles are of equal size

Air flows from the smaller bubble into the larger one and larger bubble grows at the expense of the smaller one

Question 1 of 15

2. It is easier to spray water to which soap is added, because

Addition of soap to water increases surface tension of water

Addition of soap to water decreases surface tension of water

Addition of soap to water increases its density

Addition of soap to water makes surface tension of water zero

Question 2 of 15

3. Small droplets of liquid are usually more spherical in shape than larger drops of the same liquid because:

Force of surface tension is equal and opposite to the force of gravity

Force of gravity predominates the force of surface tension

Force of surface tension predominates the force of gravity

Force of gravity and force of surface tension act in the same direction and are equal

Question 3 of 15

4. A capillary tube is dipped in a water container, so that loss is weight of the capillary tube is:

More than the upward buoyant force

Half of the buoyant force

Equal to the upward buoyant force

Less than the upward buoyant force

Question 4 of 15

5. A raft of wood (density 600 kg/m³) of mass 120 kg floats in water. How much weight can be put on the raft to make it just sink?

120 kg

200 kg

80 kg

40 kg

Question 5 of 15

6. A piece of ice is floating in a jar containing water, when the ice melts, the temperature of water falls from 4°C to 1°C. Then the level of water

Falls

Unchanged

None of these

Rises

Question 6 of 15

7. Three liquids of densities d, 2d and 3d are mixed in equal volumes. Then the density of mixture is

Question 7 of 15

8. When a soap bubble is charged:

It contracts

None of these

It does not undergo any change in size

It expands

Question 8 of 15

9. Soldering of two metals is possible because of the property of:

Surface tension

Viscosity

Cohesion

Osmosis

Question 9 of 15

10. We live in:

Stratosphere

Troposphere

Exosphere

Ionosphere

Question 10 of 15

11. A parrot is in a wire case, which is hanging from a spring balance. Initially the parrot sits in the cage and in the second instant the parrot flies inside the cage:

The reading of the balance will be greater when the parrot flies in the cage

The reading will remain unchanged

The reading of the balance will be lesser when the parrot flies in the cage

None of these

Question 11 of 15

12. Soap helps in better cleaning of clothes because:

It absorbs the dirt

It reduces the surface tension of solution

Chemical of soaps change

It does not reduces the surface tension of solution

Question 12 of 15

13. In order that a floating object be in a stable equilibrium. Its center of buoyancy should be:

Horizontally to line with its center of gravity

Vertically below its center of gravity

May be anywhere

Vertically above its center of gravity

Question 13 of 15

14. A bird, resting on the floor of an airtight box, which is being carried by a boy, starts flying. The boy will feel that the box is now:

Lighter

Shows no change in weight

Heavier

Lighter in the beginning and heavier afterwards

Question 14 of 15

15. More liquid rises in a thin tube because of:

Larger value of radius

Larger value of surface tension

Small value of radius

Small value of S.T.

Question 15 of 15

Test Name	Physics Fluid Mechanics Test Online MCQs
Subject	Physics
Test Type	MCQs
Total Question	15
Total Marks	30
Total Time	15 Mints
Test Help For	Physics Subject Test Prep. All Admissions Test. All Jobs Test prep. Medical Test prep. Engineering Test prep.

Test By Subject	Biology
Test By Topics	Biology Subject

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Physics Fluid Mechanics Test Online MCQs

Physics Fluid Mechanics Test Online MCQs

Physics

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