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

With age, least distance of distinct vision:

Question # 2

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

Question # 3

Light has:

Question # 4

Huygen's theory cannot explain

Question # 5

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

Question # 6

For the virtual image, option _______ is not correct:

Question # 7

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

Question # 8

When the object lies between F and 2F, the image formed by is formed at:

Question # 9

Light waves are:

Question # 10

The magnifier forms a virtual image of the object at:

Question # 11

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

Question # 12

Laws of reflection and refraction can also be explained by:

Question # 13

In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:

Question # 14

Wave length of that color as compared to that of violet color is:

Question # 15

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:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 The wave nature of light was proposed by:
A. Newton
B. Thomas Young
C. Huygen
D. None of these
4 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
5 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
6 A convex lens acts as diverging lens when the object is placed:
A. Beyond 2F
B. At 2F
C. With focal length
D. Between F and 2F
7 Wave length of that color as compared to that of violet color is:
A. Smaller
B. Longer
C. Equal
D. None of these
8 In case of point, source of light shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
9 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
10 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

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