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

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

Question # 3

Laws of reflection and refraction can also be explained by:

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

The ratio of the size of the image to that of object is called:

Question # 8

The least distance of distinct vision is:

Question # 9

Speed of light in vacuum depends upon:

Question # 10

A virtual image is formed when object is placed:

Question # 11

In case of point, source of light shape of wavefront is:

Question # 12

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory

Question # 13

Stars twinkle due to

Question # 14

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

Question # 15

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:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 The magnifier forms a virtual image of the object at:
A. None of these
B. Both A and B are correct
C. Much farther than the least distance
D. Least distance of distinct vision
2 The magnifier forms a virtual image of the object at:
A. None of these
B. Least distance of distinct vision
C. Much farther than the least distance
D. Both A and B are correct
3 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
4 Light waves are:
A. Transverse wave
B. Longitudinal wave
C. Compressional wave
D. None of them
5 The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.
A. Equal to
B. Greater than
C. Smaller than
D. None of these
6 A magnifier gives an image which is:
A. Virtual, inverted
B. Real, erect
C. Virtual, erect
D. Real, inverted
7 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
8 Laws of reflection and refraction can also be explained by:
A. Particle nature of light
B. Quantum nature of light
C. Wave nature of light
D. Complex nature of light
9 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
10 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. 5 cm
B. 20 cm
C. 10 cm
D. 15 cm

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