ECAT Pre Engineering Physics Chapter 9 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 9 Physical Optics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 9 Physical Optics

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Physics ECAT Pre Engineering Chapter 9 Physical Optics

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Question # 1

The distance from eye to near point is taken as:

Question # 2

In order to get interference using two light rays

Question # 3

The contrast in the fringes in an interference pattern depends upon

Question # 4

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

Question # 5

When a source of light isat very large distance,the shape of wavefront is:

Question # 6

For the virtual image, option _______ is not correct:

Question # 7

Light has:

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

Huygen principle is used to determine:

Question # 12

Light waves are:

Question # 13

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 # 14

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

Question # 15

A line which represents the direction of travel of a wave is known as:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None of these
2 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
3 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
4 Frequency of red color as compared to that of violet color is:
A. Equal
B. Smaller
C. Greater
D. None of these
5 Light appears to travel in straight line because
A. It is not absorbed by the atmosphere
B. It is refracted by the atmosphere
C. Its wavelength is very small
D. Its velocity is very large
6 When the object lies between F and 2F, the image formed by is formed at:
A. Virtual
B. Diminished
C. Erect
D. Real
7 To observe interference of light, the condition, which must be met with is that the sources must be:
A. Monochromatic
B. Phase coherent
C. Both of above
D. None of above
8 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
9 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
10 The property of light which does not change with the nature of the medium is:
A. Frequency
B. Amplitude
C. Wavelength
D. None of these

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