Basic Physics Question - Defence MCQ

The S.I unit of η is Newton- second per square metre (Nsm−2) . Hence, the coefficient of viscosity is the measure of the resistance of the fluid to deformation at the given rate due to internal friction. 

The hydraulic machine works on the principle of Pascal's Law. According to Pascal's law, the intensity of pressure at any point in a fluid at rest is same in all directions. 

Resistance force by a fluid on a body = 6πηrv, where η is coefficient of viscosity, r is radius of body & v is its velocity. This doesn’t depend on density.

Another way to think of this is to imagine a hollow and solid sphere of the same radius falling through air at the same speed. The resistance offered by air will be the same on both as they have the same surface area exposed and are moving at the same speed.

When the value of ionic roduct is greater than the value of solubility product, then precipitate is formed.

Different particles of a gas have different speeds due to constant collisions and different kinetic energies.

There are two different forms of mechanical energy,
i.e. kinetic energy and potential energy.
A is the right answer

Kinetic energy is defined as the energy possessed by a body by virtue of its motion. and it is equal to MV²
   Where m and  v are mass and Velocity of moving body.

Power is the rate at which work is done. It is the work/time ratio. 
That is,P=TW

When a body is falling freely under the influence of gravitythe kinetic energy changes as velocity changes and the potential energy changes because of change in height, However, because of the law of conservation of energy, the total mechanical energy remains constant.

The kinetic energy of a system can be changed without changing the momentum