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

In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:

Question # 2

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

Question # 3

Light appears to travel in straight line because

Question # 4

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

Question # 5

The locus of all points in a medium having same phase of vibration is called

Question # 6

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

Question # 7

The terms phase difference and path difference are:

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.

Question # 12

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

Question # 13

For the virtual image, option _______ is not correct:

Question # 14

According to Huygen's principle

Question # 15

Huygen principle is used to determine:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 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
4 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
5 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
6 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:
A. 5 cm
B. 20 cm
C. 10 cm
D. 15 cm
7 In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.
A. Bright
B. Dark
C. Any of A and B
D. None of these
8 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
9 Frequency of red color as compared to that of violet color is:
A. Equal
B. Smaller
C. Greater
D. None of these
10 Huygen principle is used to determine:
A. Speed of light
B. Location of wavefront
C. About polarized or unpolarized light
D. None of them

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