X A Physics Preliminary Exam 2021

Which of the following is the SI Unit of Electric Current?

(a) ohm

(b) ampere

(c) volt

(d) faraday

• a

• b

• c

• d

When one-unit electric charge moves from one point to another point in an electric circuit, then the amount of work done in joules is known as?

(a) Electric current

(b) electric resistance

(c) electric conductance

(d) potential difference

• a

• b

• c

• d

The resistance of a conductor is directly proportional to:

(a) Its area of cross-section

(b) density

(c) melting point

(d) length

• a

• b

• c

• d

A fuse wire is inserted in a?

(a) . Live wire

(b) . In the neutral wire

(c) . In the earth wire

(d) . May be connected in any line.

• a

• b

• c

• d

The change in the focal length of human eye is caused due to

a. Ciliary muscles

b. Pupil

c. Cornea

d. Iris

• a

• b

• c

• d

The colored light that refracts most while passing through a prism is

a. Yellow

b. Violet

c. Blue

d. Red

• a

• b

• c

• d

The amount of light entering the human eye is controlled by

a. Ciliary muscles

b. Pupil

c. Cornea

d. Iris

• a

• b

• c

• d

Power of the lens is -40, its focal length is

a. 4m

b. -40m

c. -0.25m

d. -25m

• a

• b

• c

• d

In optics an object which has higher refractive index is called

a. Optically rarer

b. Optically denser

c. Optical density

d. Refractive index

• a

• b

• c

• d

Who has stated the Right Hand Thumb Rule?

a. Orsted

b. Fleming

c. Einstein

d. Maxwell

• a

• b

• c

• d