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

In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.

Question # 2

Speed of light in vacuum depends upon:

Question # 3

The contrast in the fringes in an interference pattern depends upon

Question # 4

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

Question # 5

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

Question # 6

A virtual image is formed when object is placed:

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

According to Huygen's principle

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 If the object is situated at focus of a convex lens, then its image is formed at:
A. F
B. 2F
C. Infinity
D. None of these
4 The cause of mirage observed in deserts in bright sunlight is due to
A. Refraction of light
B. Reflection of light
C. Scattering of light
D. Total internal reflection of light
5 When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:
A. Greater, smaller
B. Smaller, smaller
C. Smaller, larger
D. Greater, larger
6 The appearance of the colour in the soap (oil) film results from:
A. Dispersion
B. Interference
C. Reflection
D. Refraction
7 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
8 Frequency of red color as compared to that of violet color is:
A. Equal
B. Smaller
C. Greater
D. None of these
9 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
10 Stars twinkle due to
A. The fact that they do not emit light continuously
B. The refractive index of earth's atmosphere fluctuates
C. The Star's atmosphere absorbs its light intermittently
D. None of these

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