Physics Questions

Q:

The working principle of a washing machine is

A) reverse osmosis B) diffusion
C) centrifugation D) dialysis
 
Answer & Explanation Answer: C) centrifugation

Explanation:

The working principle of a washing machine is centrifugation.

 

The_working_principle_of_a_washing_machine_is1542349278.jpg image

 

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
 
Answer & Explanation Answer: A) Fermi

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
 
Answer & Explanation Answer: 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
 
Answer & Explanation Answer: A) speed

Explanation:

Which_of_the_following_is_not_a_vector_quantity1552385336.png image

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
 
Answer & Explanation Answer: C) fermi

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
 
Answer & Explanation Answer: C) concave lens

Explanation:

An_air_bubble_in_water_will_act_like_a1557488532.jpg image

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
 
Answer & Explanation Answer: A) Parallactic second

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
 
Answer & Explanation Answer: A) 25 W

Explanation:

Resistances of both the bulbs are

 

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

 

R2 = V^2/P2 = 220^2/100

 

Hence  R1gt ; R2

 

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.

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