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 least distance of distinct vision is:

Question # 2

Light waves are:

Question # 3

For the virtual image, option _______ is not correct:

Question # 4

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

Question # 5

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

Question # 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:

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

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 # 11

Stars twinkle due to

Question # 12

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

Question # 13

The velocity of light in vacuum can be changed by changing

Question # 14

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

Question # 15

Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Huygen's principles states that:
A. Light has dual nature
B. Either of these
C. None of these
D. Light travels in straigth line
2 Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:
A. 6 x 10-5rad
B. 7 x 10-5rad
C. 8 x 10-5rad
D. None of these
3 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
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 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller
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 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these
8 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
9 Light waves are:
A. Transverse wave
B. Longitudinal wave
C. Compressional wave
D. None of them
10 The distance from eye to near point is taken as:
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm

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