Physics

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

Question 1 of 25

2. When a soap bubble is charged:

It expands

None of these

It does not undergo any change in size

It contracts

Question 2 of 25

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

Start oscillating

Comes back to the same position immediately

Will remain where it is left

Sink to the bottom

Question 3 of 25

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

Equal to your normal weight

Half to your normal weight

Zero

Greater than the weight of water you displace

Question 4 of 25

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

May be any where

Vertically above its centre of gravity

Vertically below its centre of gravity

Horizontally in line with its center of gravity

Question 5 of 25

6. 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:

Rise or fall depending on the number of stones unloaded

Rise

Remain unchanged

Fall

Question 6 of 25

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

Cohesion

Viscosity

Osmosis

Surface tension

Question 7 of 25

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

18/11d

13/9d

23/18d

11/7d

Question 8 of 25

9. 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?

40 kg

80 kg

200 kg

120 kg

Question 9 of 25

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

Nuclear force

Viscous force

Archimedes’ uplift

Electrostatic force

Question 10 of 25

11. 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:

Lighter

Heavier

Shows no change in weight

Lighter in the beginning and heavier afterwards

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 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

Force of surface tension predominates the force of gravity

Question 12 of 25

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

It will float as a distorted drop on the water surface

It will remain on it as a sphere

It will spread as a thin layer

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

Question 13 of 25

14. Soap helps in better cleaning of clothes because:

Chemical of soaps change

It does not reduces the surface of tension of solution

It reduces the surface tension of solution

It absorbs the dirt

Question 14 of 25

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

Larger value of surface tension

Larger value of radius

Small value of S.T.

Small value of radius

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:

289 N

119 N

163 N

273 N

Question 16 of 25

17. 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 makes surface tension of water zero

Addition of soap to water increases its density

Addition of soap to water decreases surface tension of water

Question 17 of 25

18. 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

More than the upward buoyant force

Less than the upward buoyant force

Half of the buoyant force

Question 18 of 25

19. We live in:

Exosphere

Troposphere

Ionosphere

Stratosphere

Question 19 of 25

20. 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

None of these

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

The reading will remain unchanged

Question 20 of 25

21. Magnus effect is very near to the:

Magnetic field

Electric field

Magnetic effect of current

Bernoulli’s theorem

Question 21 of 25

22. 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 rise

Will be unpredictable

Will neither rise nor sink

Will sink

Question 22 of 25

23. 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 23 of 25

24. 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

None of these

Rises

Unchanged

Question 24 of 25

25. Pressure applied to enclosed fluid is:

Increased and applied to every part of the fluid

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

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

Diminished and transmitted to wall of container

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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