ECAT Pre Engineering Physics Chapter 9 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 9 Physical Optics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 9 Physical Optics

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Physics ECAT Pre Engineering Chapter 9 Physical Optics

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Question # 1

The velocity of light in vacuum can be changed by changing

Question # 2

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

Question # 3

With age, least distance of distinct vision:

Question # 4

Huygen's principles states that:

Question # 5

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

Question # 6

The contrast in the fringes in an interference pattern depends upon

Question # 7

The distance from eye to near point is taken as:

Question # 8

A magnifier gives an image which is:

Question # 9

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

Question # 10

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

Question # 11

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 # 12

A prism splits a beam of white light into seven component colors. This is so because

Question # 13

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

Question # 14

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

Question # 15

The focal length of convex lens having magnifying power of 5.55 is:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Huygen principle is used to determine:
A. Speed of light
B. Location of wavefront
C. About polarized or unpolarized light
D. None of them
2 The ratio of the size of the image to that of object is called:
A. Focal length
B. Aperture
C. Linear magnification
D. Principal axis
3 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
4 In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:
A. Greater than
B. Equal to
C. Smaller than
D. None of these
5 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
6 According to Huygen's principle
A. light travels in straight line
B. Light is a transvers wave
C. Light has dual nature
D. All points on the primary wave-front are the sources of secondary wavelets
7 In the formula R = N x m for diffraction grating, N denotes:
A. No. of lines/cm
B. No. of lines/meter
C. Total number of lines
D. None of above
8 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
9 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
10 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

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