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 velocity of light in vacuum can be changed by changing

Question # 2

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

Question # 3

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

Question # 4

Light waves are:

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

The wave nature of light was proposed by:

Question # 9

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory

Question # 10

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

Question # 11

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 # 12

For the virtual image, option _______ is not correct:

Question # 13

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

Question # 14

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

Question # 15

Huygen principle is used to determine:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
4 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
5 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
6 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:
A. Double the size
B. Same size
C. Half the size
D. None of these
7 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
8 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
9 When the object lies between F and 2F, the image formed by is formed at:
A. Virtual
B. Diminished
C. Erect
D. Real
10 The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:
A. Greater than
B. Less than
C. Equal to
D. None of these

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