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

The terms phase difference and path difference are:

Question # 2

Monochromatic light means waves of:

Question # 3

The magnifier forms a virtual image of the object at:

Question # 4

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

Question # 5

The locus of all the points in the same phase of vibration is called:

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

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

Question # 8

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

Question # 9

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

Question # 10

Wave length of light, on the average, is given by:

Question # 11

According to Huygen's principle

Question # 12

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

Question # 13

Laws of reflection and refraction can also be explained by:

Question # 14

Angle between the ray of light and the corresponding wavefront is:

Question # 15

Light appears to travel in straight line because

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Angle between the ray of light and the corresponding wavefront is:
A. 0°
B. 60°
C. 90°
D. 120°
2 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
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 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
5 The focal length of convex lens having magnifying power of 5.55 is:
A. 5.5 cm
B. 5 cm
C. 4.5 cm
D. 6 cm
6 A ray passing through optical center of a lens, after refraction:
A. Passes through focus
B. Go deviated
C. Retraces its path
D. Both B and C
7 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
8 Resolving power in mth order diffraction for grating is given by:
A. R = N/m
B. R = m/N
C. R = N x m
D. None of these
9 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
10 Electromagnetic waves transport:
A. Energy only
B. Momentum only
C. Both A and B are correct
D. None of is correct

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