Physics

1. Soap helps in better cleaning of clothes because:

It reduces the surface tension of solution

It does not reduces the surface of tension of solution

Chemical of soaps change

It absorbs the dirt

Question 1 of 25

2. 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 2 of 25

3. We live in:

Ionosphere

Stratosphere

Exosphere

Troposphere

Question 3 of 25

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

Equal to the upward buoyant force

Less than the upward buoyant force

More than the upward buoyant force

Half of the buoyant force

Question 4 of 25

5. A body is just floating in a liquid (their densities are equal). If the body is slightly pressed down and released, it will:

Sink to the bottom

Start oscillating

Comes back to the same position immediately

Will remain where it is left

Question 5 of 25

6. If you float on your back on water, your weight is:

Equal to your normal weight

Zero

Greater than the weight of water you displace

Half to your normal weight

Question 6 of 25

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

Cohesion

Surface tension

Osmosis

Viscosity

Question 7 of 25

8. Pressure applied to enclosed fluid is:

Diminished and transmitted to wall of container

Increased and applied to every part of the fluid

Transmitted unchanged to every portion of the fluid and walls of containing vessel

Increased in proportion to the mass of the fluid and then transmitted

Question 8 of 25

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

Larger value of surface tension

Small value of S.T.

Small value of radius

Larger value of radius

Question 9 of 25

10. A vessel containing water is in equilibrium on a beam balance when a man puts his finger into the water without touching the bottom or the sides of the vessel, the scale pan on which the vessel stands:

Will neither rise nor sink

Will sink

Will be unpredictable

Will rise

Question 10 of 25

11. Three liquids of densities d, 2d and 3d are mixed in equal proportions of weights. The relative density of the mixture is:

18/11d

11/7d

13/9d

23/18d

Question 11 of 25

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

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

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

Force of gravity predominates the force of surface tension

Question 12 of 25

13. Magnus effect is very near to the:

Magnetic field

Magnetic effect of current

Bernoulli’s theorem

Electric field

Question 13 of 25

14. A drop of oil is placed on the surface of water. Which of the following statement is correct?

It will spread as a thin layer

It will remain on it as a sphere

It will be partly spread as spherical droplets and partly as thin film

It will float as a distorted drop on the water surface

Question 14 of 25

15. If there were smaller gravitational effect which of the following force do you think will alter in some respect?

Electrostatic force

Viscous force

Archimedes’ uplift

Nuclear force

Question 15 of 25

16. Find the lifting force of a 4 kg cork life but in sea water if the density of cork and sea water are 0.2*10³ kg/m³ respectively:

163 N

289 N

119 N

273 N

Question 16 of 25

17. If two soap bubbles of different radii are in communication with each other:

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

The size of the bubbles remain unchanged

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

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

Question 17 of 25

18. A boat carrying a number of stones is floating in a water tank. If the stones are unloaded into water, the water level in the tank will:

Remain unchanged

Rise or fall depending on the number of stones unloaded

Fall

Rise

Question 18 of 25

19. When a soap bubble is charged:

It contracts

None of these

It does not undergo any change in size

It expands

Question 19 of 25

20. 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

40 kg

80 kg

Question 20 of 25

21. In order that a floating objet be in a stable equilibrium, its centre of buoyancy should be:

May be any where

Vertically below its centre of gravity

Horizontally in line with its center of gravity

Vertically above its centre of gravity

Question 21 of 25

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

Question 22 of 25

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

Shows no change in weight

Heavier

Lighter

Lighter in the beginning and heavier afterwards

Question 23 of 25

24. 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 lesser when the parrot flies in the cage

The reading will remain unchanged

None of these

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

Question 24 of 25

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

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

Addition of soap to water increases surface tension of water

Question 25 of 25

Test Name	Fluid Mechanics MCQs Tets
Subject	Physics
Test Type	MCQs
Total Question	25
Total Marks	50
Total Time	20 Mints
Test Help For	Physics Subject Test Prep. All Admissions Test. All Jobs and recruitment Test prep. Medical and BDS Test prep. Engineering and B Tech Test prep.

Test By Subject	Physics
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