Explore topic-wise MCQs in Testing Subject.

This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.

1.

Two sources of light are said to be coherent if the waves prouced by them have the same

A. Wavelength
B. Amplitude
C. Wavelength and amplitude
D. Wavelength and a constant phase difference
Answer» E.
Discussion
2.

Luminous intensity of a source is defined as

A. Light energy emitted by the same source per unit time
B. Light energy emitted by the source per unit time per unit area
C. Light energy emitted by the source per unit time per unit solid angle
D. None of the above
Answer» D. None of the above
Discussion
3.

Suppose a rocket ship is receding from the earth at a speed of 2 / 10 th the velocity of light. A light in the rocket ship appears blue to the passengers on the ship. What colour would it appear to an observer on the earth ?

A. Blue
B. Orange
C. Yellow
D. Yellow-orange
Answer» B. Orange
Discussion
4.

An object is placed between two

A. 4
B. 6
C. 8
D. Infinite
Answer» E.
Discussion
5.

The angle of elevation of a cloud is

A. 330 m
B. 660 m
C. 660 3 m
D. 1320 m
Answer» C. 660 3 m
Discussion
6.

Total internal reflection of light

A. Air to glass
B. Vacuum to air
C. Air to water
D. Water to air
Answer» E.
Discussion
7.

In a cinema hall, the distance between the projector and the screen is increased by 2% Then the intensity of illumination of the screen is

A. Decreased by 2%
B. Decreased by 4%
C. Increased by 2%
D. Increased by 4%
Answer» C. Increased by 2%
Discussion
8.

An object is kept 5 cm in front of a concave mirror of focal length 15 cm. What will be nature of the image?

A. Virtual, not magnified
B. Virtual, magnified
C. Real not magnified
D. Real, magnified
Answer» C. Real not magnified
Discussion
9.

An endoscope is employed to view the internal parts of the body organ. It is based on the principle of

A. Reflection
B. Internal reflection
C. Refraction
D. Dispersion
Answer» C. Refraction
Discussion
10.

The plane surface of plano-convex lens of focal lengh f is silvered. It will behave as a

A. Plane mirror
B. Convex mirror of focal length 2 f
C. Concave mirror of focal lengh f / 2
D. None of the above
Answer» D. None of the above
Discussion
11.

An object is placed at a distance of 40 cm in front of a concave mirror of focal length 20 cm the image produced is

A. Virtual and inverted
B. Real and erect
C. Real, inverted and diminished
D. Real, inverted and of the same size as the object
Answer» E.
Discussion
12.

In a compound microscope, the intermediate image is

A. Virtual, erect and magnified
B. Real, erect and magnified
C. Real, inverted and magnified
D. Virtual, erect and reduced
Answer» D. Virtual, erect and reduced
Discussion
13.

Optical fibres are based on

A. Scattering
B. Refraction
C. Total internal reflection
D. All of these
Answer» D. All of these
Discussion
14.

The phenomenon of splitting white light into seven colours is called

A. Reflection
B. Refraction
C. Refractive index
D. Dispersion
Answer» E.
Discussion
15.

A compound microscope has a magnification of 30. The focal length of eye piece is 5 cm. If the final image is formed at the least distance of distinct vision (25 cm) the magnification produced by the objective is

A. 5
B. 7.5
C. 10
D. None of these
Answer» B. 7.5
Discussion
16.

In a compound microscope cross wires are fixed at the point

A. Where the image is formed by the objective
B. Where the image is formed by the eye piece
C. Where the focal point of the objective lies
D. Where the focal point of the eye piece lies
Answer» B. Where the image is formed by the eye piece
Discussion