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

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

Question # 2

For the virtual image, option _______ is not correct:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

Angle between the ray of light and the corresponding wavefront is:

Question # 8

Huygen's principles states that:

Question # 9

To observe interference of light, the condition, which must be met with is that the sources must be:

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

With age, least distance of distinct vision:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 A prism splits a beam of white light into seven component colors. This is so because
A. Phase of different colors is different
B. Amplitude of different colors is different
C. Wavelength of different colors is different
D. Velocity of different colors is different
3 Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?
A. Gamma rays, micro waves, visible light
B. Radio waves, ultraviolet waves, X-rays
C. Ultraviolet rays, infrared rays, micro waves
D. Visible light, gamma rays, radio waves
4 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
5 If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity
A. Fringe width will decrease
B. Fringe width will increase
C. Fringe width will remain unchanged
D. Fringe will become less intense
6 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
7 The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
A. 1
B. 0.2
C. 2
D. 0.1
8 To see the minor details of the object by microscope, it should have:
A. High magnifying power
B. High resolving power
C. Am objective of larger focal length
D. None of these
9 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
10 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

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