# 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:

The most suitable unit for expressing nuclear radius is

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

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.

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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:

Two electric bulbs marked 25W – 220V and 100W – 220V are connected in series to a 440Vsupply. Which of the bulbs will fuse?

 A) 25 W B) Both C) 100 W D) Neither

Explanation:

Resistances of both the bulbs are

R1=V^2/P1 = 220^2/25

R2 = V^2/P2 = 220^2/100

Hence

When connected in series, the voltages divide in them in the ratio of their resistances. The voltage of 440 V devides in such a way that voltage across 25 w bulb will be more than 220 V. Hence 25 w bulb will fuse.