ECAT Pre Computer Science Chapter 9 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 9 Physical Optics

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

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ECAT Physics Chapter 9 Physical Optics

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Question # 1

The contrast in the fringes in an interference pattern depends upon

Question # 2

When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:

Question # 3

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

Question # 4

Which one of the following can act approximately as a source of monochromatic light;

Question # 5

In the formula R = N x m for diffraction grating, N denotes:

Question # 6

The size of the image is maximum when its distance from the magnifying glass is:

Question # 7

In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:

Question # 8

A grating with high resolving power can distinguish _______ difference in wavelengths :

Question # 9

The wave nature of light was proposed by:

Question # 10

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

Question # 11

Huygen's theory cannot explain

Question # 12

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

Question # 13

Stars twinkle due to

Question # 14

The locus of all points in a medium having same phase of vibration is called

Question # 15

If the object is situated at focus of a convex lens, then its image is formed at:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 A ray passing through optical center of a lens, after refraction:
A. Passes through focus
B. Go deviated
C. Retraces its path
D. Both B and C
2 In order to get interference using two light rays
A. The sources should be monochromatic and coherent
B. The sources should have the same frequency
C. Superposition should be linear
D. All of these
3 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None of these
4 The size of the image is maximum when its distance from the magnifying glass is:
A. 0.10 m
B. 0.15 m
C. 0.20 m
D. 0.25 m
5 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
6 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
7 A convex lens acts as diverging lens when the object is placed:
A. Between F and 2F
B. At 2F
C. With focal length
D. Beyond 2F
8 If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:
A. Double the size
B. Same size
C. Half the size
D. None of these
9 To observe interference of light, the condition, which must be met with is that the sources must be:
A. Monochromatic
B. Phase coherent
C. Both of above
D. None of above
10 The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
A. 1
B. 0.2
C. 2
D. 0.1

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