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

According to Huygen's principle

Question # 2

For the virtual image, option _______ is not correct:

Question # 3

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

Question # 4

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

Question # 5

To sources are said to be coherent if they have:

Question # 6

Wave length of light, on the average, is given by:

Question # 7

Least distance of distinct vision of an old man possibly becomes:

Question # 8

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity

Question # 9

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

Question # 10

The least distance of distinct vision is:

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Speed of light in vacuum depends upon:
A. Frequency
B. Wavelength
C. Amplitude
D. None of these
2 A virtual image is formed when object is placed:
A. Within focal length of a convex lens
B. Near the focal point of a concave lens
C. Both A and B
D. Away from 2F of a convex lens
3 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
4 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
5 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
6 A line which represents the direction of travel of a wave is known as:
A. Spherical Wavefront
B. Locus
C. Ray
D. Either B or C
7 In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:
A. Greater than
B. Smaller than
C. Equal to
D. None of these
8 Resolving power in mth order diffraction for grating is given by:
A. R = N x m
B. None of these
C. R = m/N
D. R = N/m
9 Huygen principle is used to determine:
A. Speed of light
B. Location of wavefront
C. About polarized or unpolarized light
D. None of them
10 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

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