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

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:

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

For the virtual image, option _______ is not correct:

Question # 6

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

Question # 7

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

Question # 8

The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:

Question # 9

The distance from eye to near point is taken as:

Question # 10

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

Question # 11

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called

Question # 12

In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.

Question # 13

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

Question # 14

The wave nature of light was proposed by:

Question # 15

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

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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 distance from eye to near point is taken as:
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm
3 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
4 If the object is situated at focus of a convex lens, then its image is formed at:
A. F
B. 2F
C. Infinity
D. None of these
5 The locus of all the points in the same phase of vibration is called:
A. Wave packet
B. Wave front
C. Wave number
D. None of them
6 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
7 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
8 The locus of all points in a medium having same phase of vibration is called
A. Crest
B. Trough
C. Wavelength
D. Wave-front
9 The velocity of light in vacuum can be changed by changing
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
10 To sources are said to be coherent if they have:
A. Same amplitude
B. Same wavelength
C. Definite phase relation with each other
D. None of them

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