ECAT Pre General Science Physics Chapter 9 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 9 Physical Optics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 9 Physical Optics

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ECAT Pre General Science Physics Chapter 9 Physical Optics

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Question # 1

A ray passing through optical center of a lens, after refraction:

Question # 2

To sources are said to be coherent if they have:

Question # 3

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called

Question # 4

A convex lens acts as diverging lens when the object is placed:

Question # 5

The cause of mirage observed in deserts in bright sunlight is due to

Question # 6

With age, least distance of distinct vision:

Question # 7

The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:

Question # 8

If the focal length of the convex lens is 5 cm, then to get the real and inverted image of the same size as that of object, the object should be placed at:

Question # 9

Angle between the ray of light and the corresponding wavefront is:

Question # 10

The least distance of distinct vision is:

Question # 11

A line which represents the direction of travel of a wave is known as:

Question # 12

Resolving power in mth order diffraction for grating is given by:

Question # 13

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

Question # 14

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

Question # 15

The magnifier forms a virtual image of the object at:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Light appears to travel in straight line because
A. It is not absorbed by the atmosphere
B. It is refracted by the atmosphere
C. Its wavelength is very small
D. Its velocity is very large
2 In the formula R = N x m for diffraction grating, N denotes:
A. No. of lines/cm
B. No. of lines/meter
C. Total number of lines
D. None of above
3 The least distance of distinct vision is:
A. 10 cm
B. 25 cm
C. 50 cm
D. 100 cm
4 The focal length of convex lens having magnifying power of 5.55 is:
A. 5.5 cm
B. 5 cm
C. 4.5 cm
D. 6 cm
5 Resolving power in mth order diffraction for grating is given by:
A. R = N/m
B. R = m/N
C. R = N x m
D. None of these
6 In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:
A. Greater than
B. Equal to
C. Smaller than
D. None of these
7 The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called
A. Diffraction
B. Interference
C. Polarization
D. Dispersion
8 Which one of the following can act approximately as a source of monochromatic light;
A. Neon lamp
B. Fluorescent tube
C. Sodium lamp
D. None of these
9 Wave length of that color as compared to that of violet color is:
A. Smaller
B. Longer
C. Equal
D. None of these
10 The property of light which does not change with the nature of the medium is:
A. Frequency
B. Amplitude
C. Wavelength
D. None of these

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