ECAT Pre General Science Physics Chapter 9 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 9 Physical Optics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 9 Physical Optics

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ECAT Pre General Science Physics Chapter 9 Physical Optics

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Question # 1

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

Question # 2

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

Question # 3

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

Question # 4

The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:

Question # 5

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

Question # 6

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 # 7

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 # 8

Huygen principle is used to determine:

Question # 9

According to Huygen's principle

Question # 10

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

Question # 11

Speed of light in vacuum depends upon:

Question # 12

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

Question # 13

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

Question # 14

Light waves are:

Question # 15

Light has:

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Sr.# Question Answer
1 Light waves are:
A. Transverse wave
B. Longitudinal wave
C. Compressional wave
D. None of them
2 A convex lens acts as diverging lens when the object is placed:
A. Between F and 2F
B. At 2F
C. With focal length
D. Beyond 2F
3 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
4 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
5 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
6 The ratio of the size of the image to that of object is called:
A. Focal length
B. Aperture
C. Linear magnification
D. Principal axis
7 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
8 With age, least distance of distinct vision:
A. Increases
B. Decreases
C. Is not affected
D. None is correct
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. 5 cm
B. 20 cm
C. 10 cm
D. 15 cm
10 Electromagnetic waves transport:
A. Energy only
B. Momentum only
C. Both A and B are correct
D. None of is correct
11 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
12 The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:
A. Greater than
B. Less than
C. Equal to
D. None of these
13 The appearance of the colour in the soap (oil) film results from:
A. Dispersion
B. Interference
C. Reflection
D. Refraction
14 In order to get interference using two light rays
A. The sources should be monochromatic and coherent
B. The sources should have the same frequency
C. Superposition should be linear
D. All of these
15 The velocity of light in vacuum can be changed by changing
A. Frequency
B. Amplitude
C. Wavelength
D. None of these

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