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

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 # 2

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

Question # 3

A magnifier gives an image which is:

Question # 4

Light has:

Question # 5

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 # 6

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

Question # 7

The velocity of light in vacuum can be changed by changing

Question # 8

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

Question # 9

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

Question # 10

In an interference pattern of Young's double slit(YDS) experiment:

Question # 11

Huygen's theory cannot explain

Question # 12

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

Question # 13

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

Question # 14

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 # 15

The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 Least distance of distinct vision of an old man possibly becomes:
A. A little less than 25 cm
B. A little more than 25 cm
C. Much less than 25 cm
D. None of these
3 If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity
A. Fringe width will decrease
B. Fringe width will increase
C. Fringe width will remain unchanged
D. Fringe will become less intense
4 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
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 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these
7 When the object lies between F and 2F, the image formed by is formed at:
A. Virtual
B. Diminished
C. Erect
D. Real
8 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
9 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
10 Angle between the ray of light and the corresponding wavefront is:
A. 0°
B. 60°
C. 90°
D. 120°

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