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

The velocity of light in vacuum can be changed by changing

Question # 3

In order to get interference using two light rays

Question # 4

Light has:

Question # 5

The size of the image is maximum when its distance from the magnifying glass is:

Question # 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:

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

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

Question # 9

The magnifier forms a virtual image of the object at:

Question # 10

The cause of mirage observed in deserts in bright sunlight is due to

Question # 11

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

Question # 12

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

Question # 13

The wave nature of light was proposed by:

Question # 14

To sources are said to be coherent if they have:

Question # 15

A virtual image is formed when object is placed:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 A convex lens acts as diverging lens when the object is placed:
A. Beyond 2F
B. At 2F
C. With focal length
D. Between F and 2F
3 Electromagnetic waves transport:
A. Energy only
B. Momentum only
C. Both A and B are correct
D. None of is correct
4 The property of light which does not change with the nature of the medium is:
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
5 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these
6 When the object lies between F and 2F, the image formed by is formed at:
A. Real
B. Virtual
C. Diminished
D. Erect
7 The image of the tip of a needle is never sharp because of
A. Polarization of light
B. Interference of light
C. Diffraction of light
D. Reflection of light
8 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
9 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
10 For the virtual image, option _______ is not correct:
A. 1/p = 1/f -1/q
B. 1/f = 1/p -1/q
C. 1/p=1/p-1/f
D. 1/p=1/f+1/q

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