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

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

Question # 3

Stars twinkle due to

Question # 4

A virtual image is formed when object is placed:

Question # 5

To sources are said to be coherent if they have:

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

When a source of light isat very large distance,the shape of wavefront is:

Question # 10

When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

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

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 The image of the tip of a needle is never sharp because of
A. Polarization of light
B. Interference of light
C. Diffraction of light
D. Reflection of light
2 The least distance of distinct vision is:
A. 10 cm
B. 25 cm
C. 50 cm
D. 100 cm
3 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
4 Which one of the following can act approximately as a source of monochromatic light;
A. Neon lamp
B. Fluorescent tube
C. Sodium lamp
D. None of these
5 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
6 Light waves are:
A. Transverse wave
B. Longitudinal wave
C. Compressional wave
D. None of them
7 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
8 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
9 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
10 Which one of the following phenomenon cannot be explained on the bases of Huygen's theory
A. Refraction
B. Reflection
C. Diffraction
D. Formation of spectrum

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