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 magnifier gives an image which is:

Question # 2

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

Question # 3

Light appears to travel in straight line because

Question # 4

According to Huygen's principle

Question # 5

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 # 6

The image of the tip of a needle is never sharp because of

Question # 7

The size of the image is maximum when its distance from the magnifying glass is:

Question # 8

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

Question # 9

Light waves are:

Question # 10

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 # 11

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

Question # 12

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

Question # 13

Angle between the ray of light and the corresponding wavefront is:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 If the object is situated at focus of a convex lens, then its image is formed at:
A. F
B. 2F
C. Infinity
D. None of these
2 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
3 In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:
A. Greater than
B. Smaller than
C. Equal to
D. None of these
4 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
5 The contrast in the fringes in an interference pattern depends upon
A. Fringe width
B. Relative difference intensities of the two sources
C. Distance between the slits
D. Wavelength
6 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these
7 The appearance of the colour in the soap (oil) film results from:
A. Dispersion
B. Interference
C. Reflection
D. Refraction
8 Stars twinkle due to
A. The fact that they do not emit light continuously
B. The refractive index of earth's atmosphere fluctuates
C. The Star's atmosphere absorbs its light intermittently
D. None of these
9 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
10 Huygen's theory cannot explain
A. Diffraction
B. Interference
C. Polarization
D. Photoelectric effect

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