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

Huygen's theory cannot explain

Question # 2

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

Question # 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:

Question # 4

The cause of mirage observed in deserts in bright sunlight is due to

Question # 5

To see the minor details of the object by microscope, it should have:

Question # 6

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:

Question # 7

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

Question # 8

According to Huygen's principle

Question # 9

A convex lens acts as diverging lens when the object is placed:

Question # 10

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

Question # 11

Conventionally, all the distance p, q, f are measured from _____ of the lens:

Question # 12

Wave length of that color as compared to that of violet color is:

Question # 13

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

Question # 14

Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?

Question # 15

Stars twinkle due to

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 In the formula R = N x m for diffraction grating, N denotes:
A. No. of lines/cm
B. No. of lines/meter
C. Total number of lines
D. None of above
2 Electromagnetic waves transport:
A. Energy only
B. Momentum only
C. Both A and B are correct
D. None of is correct
3 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
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 Angle between the ray of light and the corresponding wavefront is:
A. 0°
B. 60°
C. 90°
D. 120°
6 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
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 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
9 Huygen's principles states that:
A. Light has dual nature
B. Either of these
C. None of these
D. Light travels in straigth line
10 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller

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