Physics - MOST IMPORTANT NDA Previous Year Questions

Why doesn't Archimedes' principle hold for a vessel under a free fall?

A block of weight W floats in a lake. If the apparent weight of the floating block is W', then which one of the following is correct?

The specific gravity of a substance is measured by a hydrometer at the sea level. If the measurement is done at the top of a mountain, what would be the specific gravity?

Consider the following statements: If there were no capillarity,

1. it would be impossible to use a kerosene lamp.
2. one would not be able to use a straw to consume a soft drink.
3. the blotting paper would fail to function.
4. there would have been no plants on the earth.
   Which of the statements given above are correct?

A solid cube of iron (specific gravity = 8) is melted into sheets. The side of the cube is 1m. The sheets are used to make a hollow cube. This cube floats such that its whole volume is inside water. What should be the minimum length of side of such a cube?

A block of ice is floating in a beaker containing liquid of specific gravity greater than one. When ice melts completely what happens to the level of liquid in the beaker?

A cylinder of mass m and radius R floats vertically in a liquid of density d. What is the height of the submerged region?

Consider the following statements:
The fraction of a ball floating inside the liquid depends upon

1. density of the liquid.
2. mass of the ball.
3. density of the ball.
   Which of the statements given above are correct?

Consider the following statements:
An external pressure p0 is applied to the surface of a liquid in a container. Then,

1. the pressure on all side-wells increases by p0
2. the pressure on the bottom wall increases by p0
3. the pressure at all points inside the liquid increases by p0
   Which of the statements given above is/are correct?

Let us assume that air density(0.0013g/ cm^3) remains constant as we go up in the atmosphere. In such a hypothetical case, what is the approximate height of atmosphere to have 1 atmospheric pressure?

Flow velocities in an incompressible fluid can be measured with which one of the following?

A syringe is a hollow glass tube with lower end tapered to a nozzle. Due to which one of the following liquid can be drawn into a syringe?

The mass of water vapour per unit volume of air is known

Kinetic viscosity of a given liquid is the ratio of the

When oil floats on water, the surface tension of water

Consider two hollow glass spheres, one containing water and the other containing mercury. Each liquid fills about one-tenth of the volume of the sphere. In zero gravity environment

The density of cast iron having specific gravity 7.20 is

A vessel contains oil of density 0.8 gm/cm^3 over mercury of density 13.6 gm/cm^3. A homogeneous sphere floats with half of its volume immersed in mercury and the other half in oil. The density of the material of the sphere in CGS unit is

Water flows out of the hole of a bucket and follows a parabolic path. If the bucket falls freely under gravity, the water flow (ignoring air resistance)

A vessel contains oil (density p1) over a liquid of density p2; a homogeneous sphere of volume V floats with half of its volume immersed in the liquid and the other half in oil. The weight of the sphere is