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

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:

Question # 2

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

Question # 3

In case of point, source of light shape of wavefront is:

Question # 4

The locus of all the points in the same phase of vibration is called:

Question # 5

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

Question # 6

Light waves are:

Question # 7

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

Question # 8

Light has:

Question # 9

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

Question # 10

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

Question # 11

A prism splits a beam of white light into seven component colors. This is so because

Question # 12

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

Question # 13

The velocity of light in vacuum can be changed by changing

Question # 14

According to Huygen's principle

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
A. 1
B. 0.2
C. 2
D. 0.1
2 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
3 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
4 Frequency of red color as compared to that of violet color is:
A. Equal
B. Smaller
C. Greater
D. None of these
5 A virtual image is formed when object is placed:
A. Within focal length of a convex lens
B. Near the focal point of a concave lens
C. Both A and B
D. Away from 2F of a convex lens
6 The locus of all the points in the same phase of vibration is called:
A. Wave packet
B. Wave front
C. Wave number
D. None of them
7 With age, least distance of distinct vision:
A. Increases
B. Decreases
C. Is not affected
D. None is correct
8 Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:
A. 6 x 10-5rad
B. 7 x 10-5rad
C. 8 x 10-5rad
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 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

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