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

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

Question # 2

With age, least distance of distinct vision:

Question # 3

The property of light which does not change with the nature of the medium is:

Question # 4

In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:

Question # 5

Monochromatic light means waves of:

Question # 6

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

Question # 7

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

Question # 8

When the object lies between F and 2F, the image formed by is formed at:

Question # 9

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

Question # 10

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

Question # 11

To observe interference of light, the condition, which must be met with is that the sources must be:

Question # 12

Wave length of that color as compared to that of violet color is:

Question # 13

The image of the tip of a needle is never sharp because of

Question # 14

The wave nature of light was proposed by:

Question # 15

When a source of light isat very large distance,the shape of wavefront is:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focus length of the lens will be:
A. 5 cm
B. 10 cm
C. 20 cm
D. 25 cm
2 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
3 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
4 A prism splits a beam of white light into seven component colors. This is so because
A. Phase of different colors is different
B. Amplitude of different colors is different
C. Wavelength of different colors is different
D. Velocity of different colors is different
5 How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:
A. The upper half of the image is cut off
B. The brightness of the image is reduced
C. The brightness of the image is increased
D. No effect at all
6 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:
A. 15 cm
B. 10 cm
C. 20 cm
D. 5 cm
7 For the virtual image, option _______ is not correct:
A. 1/p = 1/f -1/q
B. 1/f = 1/p -1/q
C. 1/p=1/p-1/f
D. 1/p=1/f+1/q
8 Wave length of that color as compared to that of violet color is:
A. Smaller
B. Longer
C. Equal
D. None of these
9 In an interference pattern of Young's double slit(YDS) experiment:
A. Bright fringesare wider than dark fringes
B. Dark fringes are wider than bright fringes
C. Both dark and bright fringes are of equal width
D.

Central fringes are wider than the outer fringes
10 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these

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