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

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

The contrast in the fringes in an interference pattern depends upon

Question # 3

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

Question # 4

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

Question # 5

A grating with high resolving power can distinguish _______ difference in wavelengths :

Question # 6

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

Question # 7

Laws of reflection and refraction can also be explained by:

Question # 8

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

Question # 9

To see the minor details of the object by microscope, it should have:

Question # 10

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

Question # 11

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

Question # 12

Light waves are:

Question # 13

The terms phase difference and path difference are:

Question # 14

Light has:

Question # 15

The least distance of distinct vision is:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 The focal length of convex lens having magnifying power of 5.55 is:
A. 5.5 cm
B. 5 cm
C. 4.5 cm
D. 6 cm
3 Electromagnetic waves transport:
A. Energy only
B. Momentum only
C. Both A and B are correct
D. None of is correct
4 When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:
A. Greater, smaller
B. Smaller, smaller
C. Smaller, larger
D. Greater, larger
5 With age, least distance of distinct vision:
A. Increases
B. Decreases
C. Is not affected
D. None is correct
6 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
7 Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?
A. Gamma rays, micro waves, visible light
B. Radio waves, ultraviolet waves, X-rays
C. Ultraviolet rays, infrared rays, micro waves
D. Visible light, gamma rays, radio waves
8 The least distance of distinct vision is:
A. 10 cm
B. 25 cm
C. 50 cm
D. 100 cm
9 The velocity of light in vacuum can be changed by changing
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
10 For the virtual image, option _______ is not correct:
A. 1/p = 1/f -1/q
B. 1/f = 1/p -1/q
C. 1/p=1/p-1/f
D. 1/p=1/f+1/q

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