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

Question # 2

To sources are said to be coherent if they have:

Question # 3

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

Question # 4

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

Question # 5

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

Question # 6

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

Question # 7

Light has:

Question # 8

Stars twinkle due to

Question # 9

Huygen's theory cannot explain

Question # 10

Monochromatic light means waves of:

Question # 11

Speed of light in vacuum depends upon:

Question # 12

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 # 13

Frequency of red color as compared to that of violet color is:

Question # 14

The magnifier forms a virtual image of the object at:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.
A. Bright
B. Dark
C. Any of A and B
D. None of these
2 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
3 When the object lies between F and 2F, the image formed by is formed at:
A. Virtual
B. Diminished
C. Erect
D. Real
4 Huygen's theory cannot explain
A. Diffraction
B. Interference
C. Polarization
D. Photoelectric effect
5 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m
6 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
7 Which one of the following can act approximately as a source of monochromatic light;
A. Neon lamp
B. Fluorescent tube
C. Sodium lamp
D. None of these
8 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller
9 Speed of light in vacuum depends upon:
A. Frequency
B. Wavelength
C. Amplitude
D. None of these
10 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them

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