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

00:00
Question # 1

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

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

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

Question # 4

The terms phase difference and path difference are:

Question # 5

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

Question # 6

A virtual image is formed when object is placed:

Question # 7

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

Question # 8

Least distance of distinct vision of an old man possibly becomes:

Question # 9

Monochromatic light means waves of:

Question # 10

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

Question # 11

The magnifier forms a virtual image of the object at:

Question # 12

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

Question # 13

The least distance of distinct vision is:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:
A. Greater than
B. Equal to
C. Smaller than
D. None of these
2 The locus of all points in a medium having same phase of vibration is called
A. Crest
B. Trough
C. Wavelength
D. Wave-front
3 Huygen's principles states that:
A. Light has dual nature
B. Either of these
C. None of these
D. Light travels in straigth line
4 When the object lies between F and 2F, the image formed by is formed at:
A. Real
B. Virtual
C. Diminished
D. Erect
5 Resolving power in mth order diffraction for grating is given by:
A. R = N x m
B. None of these
C. R = m/N
D. R = N/m
6 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
7 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
8 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
9 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
10 The focal length of convex lens having magnifying power of 5.55 is:
A. 5.5 cm
B. 5 cm
C. 4.5 cm
D. 6 cm

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