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

With age, least distance of distinct vision:

Question # 2

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

Question # 3

Least distance of distinct vision of an old man possibly becomes:

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

The ratio of the size of the image to that of object is called:

Question # 9

In order to get interference using two light rays

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:

Question # 15

Speed of light in vacuum depends upon:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:
A. Greater than
B. Smaller than
C. Equal to
D. None of these
2 The ratio of the size of the image to that of object is called:
A. Focal length
B. Aperture
C. Linear magnification
D. Principal axis
3 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
4 Resolving power in mth order diffraction for grating is given by:
A. R = N x m
B. None of these
C. R = m/N
D. R = N/m
5 The magnifier forms a virtual image of the object at:
A. None of these
B. Least distance of distinct vision
C. Much farther than the least distance
D. Both A and B are correct
6 The velocity of light in vacuum can be changed by changing
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
7 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
8 In case of point, source of light shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
9 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
10 The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called
A. Diffraction
B. Interference
C. Polarization
D. Dispersion

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