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

Wave length of that color as compared to that of violet color is:

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

Speed of light in vacuum depends upon:

Question # 8

Huygen's theory cannot explain

Question # 9

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

Question # 10

Monochromatic light means waves of:

Question # 11

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

Question # 12

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

Question # 13

The contrast in the fringes in an interference pattern depends upon

Question # 14

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

Question # 15

The velocity of light in vacuum can be changed by changing

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 In order to get interference using two light rays
A. The sources should be monochromatic and coherent
B. The sources should have the same frequency
C. Superposition should be linear
D. All of these
2 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
3 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None of these
4 Huygen's theory cannot explain
A. Diffraction
B. Interference
C. Polarization
D. Photoelectric effect
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 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
7 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
8 The locus of all points in a medium having same phase of vibration is called
A. Crest
B. Trough
C. Wavelength
D. Wave-front
9 When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:
A. Greater, smaller
B. Smaller, smaller
C. Smaller, larger
D. Greater, larger
10 Electromagnetic waves transport:
A. Energy only
B. Momentum only
C. Both A and B are correct
D. None of is correct

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