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

A convex lens acts as diverging lens when the object is placed:

Question # 2

In case of point, source of light shape of wavefront is:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

Which one of the following can act approximately as a source of monochromatic light;

Question # 7

Light waves are:

Question # 8

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

Question # 9

Conventionally, all the distance p, q, f are measured from _____ of the lens:

Question # 10

Laws of reflection and refraction can also be explained by:

Question # 11

Monochromatic light means waves of:

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

With age, least distance of distinct vision:

Question # 14

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

Question # 15

A magnifier gives an image which is:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 In an interference pattern of Young's double slit(YDS) experiment:
A. Bright fringesare wider than dark fringes
B. Dark fringes are wider than bright fringes
C. Both dark and bright fringes are of equal width
D.

Central fringes are wider than the outer fringes
2 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:
A. 15 cm
B. 10 cm
C. 20 cm
D. 5 cm
3 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
4 Speed of light in vacuum depends upon:
A. Frequency
B. Wavelength
C. Amplitude
D. None of these
5 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
6 When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:
A. Greater, smaller
B. Smaller, smaller
C. Smaller, larger
D. Greater, larger
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 The terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these
9 The velocity of light in vacuum can be changed by changing
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
10 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

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