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

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

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

Light has:

Question # 8

The velocity of light in vacuum can be changed by changing

Question # 9

Light waves are:

Question # 10

The locus of all points in a medium having same phase of vibration is called

Question # 11

Electromagnetic waves transport:

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

In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Speed of light in vacuum depends upon:
A. Frequency
B. Wavelength
C. Amplitude
D. None of these
2 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
3 According to Huygen's principle
A. light travels in straight line
B. Light is a transvers wave
C. Light has dual nature
D. All points on the primary wave-front are the sources of secondary wavelets
4 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
5 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
6 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these
7 Least distance of distinct vision of an old man possibly becomes:
A. A little less than 25 cm
B. A little more than 25 cm
C. Much less than 25 cm
D. None of these
8 In the formula R = N x m for diffraction grating, N denotes:
A. No. of lines/cm
B. No. of lines/meter
C. Total number of lines
D. None of above
9 The velocity of light in vacuum can be changed by changing
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
10 How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:
A. The upper half of the image is cut off
B. The brightness of the image is reduced
C. The brightness of the image is increased
D. No effect at all

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