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

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

Question # 2

When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:

Question # 3

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

Question # 4

With age, least distance of distinct vision:

Question # 5

In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.

Question # 6

A magnifier gives an image which is:

Question # 7

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 # 8

Light waves are:

Question # 9

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

Question # 10

Which one of the following can act approximately as a source of monochromatic light;

Question # 11

Huygen's principles states that:

Question # 12

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

Question # 13

A ray passing through optical center of a lens, after refraction:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 Speed of light in vacuum depends upon:
A. Frequency
B. Wavelength
C. Amplitude
D. None of these
3 The appearance of the colour in the soap (oil) film results from:
A. Dispersion
B. Interference
C. Reflection
D. Refraction
4 Which one of the following phenomenon cannot be explained on the bases of Huygen's theory
A. Refraction
B. Reflection
C. Diffraction
D. Formation of spectrum
5 Resolving power in mth order diffraction for grating is given by:
A. R = N/m
B. R = m/N
C. R = N x m
D. None of these
6 If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focus length of the lens will be:
A. 5 cm
B. 10 cm
C. 20 cm
D. 25 cm
7 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these
8 Huygen's principles states that:
A. Light has dual nature
B. Either of these
C. None of these
D. Light travels in straigth line
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 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these

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