ECAT Pre Engineering Physics Chapter 9 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 9 Physical Optics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 9 Physical Optics

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Physics ECAT Pre Engineering Chapter 9 Physical Optics

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Question # 1

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

Question # 2

If the focal length of the convex lens is 5 cm, then to get the real and inverted image of the same size as that of object, the object should be placed at:

Question # 3

Light waves are:

Question # 4

The terms phase difference and path difference are:

Question # 5

The wave nature of light was proposed by:

Question # 6

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

Question # 7

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called

Question # 8

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

Question # 9

Light has:

Question # 10

If the object is situated at focus of a convex lens, then its image is formed at:

Question # 11

The magnifier forms a virtual image of the object at:

Question # 12

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

Question # 13

To sources are said to be coherent if they have:

Question # 14

Wave length of light, on the average, is given by:

Question # 15

The contrast in the fringes in an interference pattern depends upon

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 When the object lies between F and 2F, the image formed by is formed at:
A. Virtual
B. Diminished
C. Erect
D. Real
2 Angle between the ray of light and the corresponding wavefront is:
A. 0°
B. 60°
C. 90°
D. 120°
3 In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:
A. Greater than
B. Smaller than
C. Equal to
D. None of these
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 In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:
A. Greater than
B. Equal to
C. Smaller than
D. None of these
6 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
7 The wave nature of light was proposed by:
A. Newton
B. Thomas Young
C. Huygen
D. None of these
8 With age, least distance of distinct vision:
A. Increases
B. Decreases
C. Is not affected
D. None is correct
9 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
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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