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

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

Question # 2

The contrast in the fringes in an interference pattern depends upon

Question # 3

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

Question # 4

Laws of reflection and refraction can also be explained by:

Question # 5

The focal length of convex lens having magnifying power of 5.55 is:

Question # 6

A virtual image is formed when object is placed:

Question # 7

Huygen principle is used to determine:

Question # 8

Electromagnetic waves transport:

Question # 9

The image of the tip of a needle is never sharp because of

Question # 10

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

Question # 11

The velocity of light in vacuum can be changed by changing

Question # 12

With age, least distance of distinct vision:

Question # 13

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

Question # 14

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller
3 Electromagnetic waves transport:
A. Energy only
B. Momentum only
C. Both A and B are correct
D. None of is correct
4 Frequency of red color as compared to that of violet color is:
A. Equal
B. Smaller
C. Greater
D. None of these
5 The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.
A. Equal to
B. Greater than
C. Smaller than
D. None of these
6 Light appears to travel in straight line because
A. It is not absorbed by the atmosphere
B. It is refracted by the atmosphere
C. Its wavelength is very small
D. Its velocity is very large
7 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:
A. Double the size
B. Same size
C. Half the size
D. None of these
8 The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
A. 1
B. 0.2
C. 2
D. 0.1
9 A virtual image is formed when object is placed:
A. Within focal length of a convex lens
B. Near the focal point of a concave lens
C. Both A and B
D. Away from 2F of a convex lens
10 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these

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