# Physics Questions

Q:

The working principle of a washing machine is

 A) reverse osmosis B) diffusion C) centrifugation D) dialysis

Explanation:

The working principle of a washing machine is centrifugation.

Centrifugation is a separation process which uses the action of centrifugal force to promote accelerated settling of particles in a solid-liquid mixture.

The washing machine consists of centrifuge for this purpose. A centrifuge is a piece of equipment that puts an object in rotation around a fixed axis, applying a force perpendicular to the axis of spin that can be very strong.

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Q:

Nuclear sizes are expressed in a unit named

 A) Fermi B) Angstrom C) Newton D) Tesla

Explanation:

Nuclear sizes are expressed in a unit called "Fermi" which is a unit of length equal to 10−15 metre (one femtometre), used in nuclear physics. It is similar to the diameter of a proton.

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Q:

The speed of light will be minimum while passing through

 A) water B) vaccum C) air D) glass

Explanation:

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Q:

Which of the following is not a vector quantity?

 A) speed B) velocity C) torque D) displacement

Explanation:

A vector quantity is a quantity which has both magnitude and direction. Here in the given options, speed is a scalar quantity but not the vector quantity.

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Q:

Which of the following is/are state function / functions?

1. q + w

2. q

3. w

4. H -TS

Select the correct answer using the code given below.

 A) 1 and 4 only B) 1, 2 and 4 C) 2, 3 and 4 D) 1 only

Explanation:

Q and w are path functions while q+w i.e. H, enthalpy is state function. Similarly, H-TS i.e. G, Gibbs free energy is state function.

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Q:

The most suitable unit for expressing nuclear radius is

 A) micro B) nanometre C) fermi D) angstrom

Explanation:

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Q:

Which of the following is not the unit of time

 A) Parallactic second B) Micro Second C) Leap year D) Solar day

Explanation:

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Q:

An air bubble in water will act like a

 A) convex lens B) convex mirror C) concave lens D) concave mirror

Explanation:

The lens which have atleast one inward curved surface is a concave lens. Concave ens is a diverging lens as it spreads out light rays that have been refracted through it.

A concave lens is thinner at its centre than at its edges.