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 magnifier forms a virtual image of the object at:

Question # 2

The terms phase difference and path difference are:

Question # 3

A line which represents the direction of travel of a wave is known as:

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

Light appears to travel in straight line because

Question # 8

In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:

Question # 9

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 # 10

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

Question # 11

Monochromatic light means waves of:

Question # 12

If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:

Question # 13

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

Question # 14

Conventionally, all the distance p, q, f are measured from _____ of the lens:

Question # 15

The wave nature of light was proposed by:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 Angle between the ray of light and the corresponding wavefront is:
A. 0°
B. 60°
C. 90°
D. 120°
3 How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:
A. The upper half of the image is cut off
B. The brightness of the image is reduced
C. The brightness of the image is increased
D. No effect at all
4 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
5 The wave nature of light was proposed by:
A. Newton
B. Thomas Young
C. Huygen
D. None of these
6 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
7 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
8 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
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 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

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