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

00:00
Question # 1

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

Question # 2

In order to get interference using two light rays

Question # 3

A virtual image is formed when object is placed:

Question # 4

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 # 5

Light waves are:

Question # 6

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

Question # 7

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

Question # 8

Monochromatic light means waves of:

Question # 9

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

Question # 10

The contrast in the fringes in an interference pattern depends upon

Question # 11

The least distance of distinct vision is:

Question # 12

For the virtual image, option _______ is not correct:

Question # 13

The terms phase difference and path difference are:

Question # 14

A magnifier gives an image which is:

Question # 15

The appearance of the colour in the soap (oil) film results from:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these
2 Angle between the ray of light and the corresponding wavefront is:
A. 0°
B. 60°
C. 90°
D. 120°
3 The locus of all points in a medium having same phase of vibration is called
A. Crest
B. Trough
C. Wavelength
D. Wave-front
4 Huygen's principles states that:
A. Light has dual nature
B. Either of these
C. None of these
D. Light travels in straigth line
5 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
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 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
8 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
9 Light waves are:
A. Transverse wave
B. Longitudinal wave
C. Compressional wave
D. None of them
10 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m

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