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

Question # 2

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

Question # 3

Light has:

Question # 4

Huygen's theory cannot explain

Question # 5

The least distance of distinct vision is:

Question # 6

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:

Question # 7

The wave nature of light was proposed by:

Question # 8

The appearance of the colour in the soap (oil) film results from:

Question # 9

In the formula R = N x m for diffraction grating, N denotes:

Question # 10

To sources are said to be coherent if they have:

Question # 11

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

Question # 12

To see the minor details of the object by microscope, it should have:

Question # 13

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

Question # 14

The contrast in the fringes in an interference pattern depends upon

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
2 The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:
A. Greater than
B. Less than
C. Equal to
D. None of these
3 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
4 Huygen principle is used to determine:
A. Speed of light
B. Location of wavefront
C. About polarized or unpolarized light
D. None of them
5 The velocity of light in vacuum can be changed by changing
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
6 With age, least distance of distinct vision:
A. Increases
B. Decreases
C. Is not affected
D. None is correct
7 Light waves are:
A. Transverse wave
B. Longitudinal wave
C. Compressional wave
D. None of them
8 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
9 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
10 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

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