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

The terms phase difference and path difference are:

Question # 2

The magnifier forms a virtual image of the object at:

Question # 3

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

Question # 4

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

Question # 5

The ratio of the size of the image to that of object is called:

Question # 6

Huygen's principles states that:

Question # 7

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

Question # 8

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 # 9

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

Question # 10

The velocity of light in vacuum can be changed by changing

Question # 11

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity

Question # 12

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

Question # 13

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 # 14

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

Question # 15

Monochromatic light means waves of:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:
A. The upper half of the image is cut off
B. The brightness of the image is reduced
C. The brightness of the image is increased
D. No effect at all
2 Laws of reflection and refraction can also be explained by:
A. Particle nature of light
B. Quantum nature of light
C. Wave nature of light
D. Complex nature of light
3 When the object lies between F and 2F, the image formed by is formed at:
A. Real
B. Virtual
C. Diminished
D. Erect
4 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
5 The image of the tip of a needle is never sharp because of
A. Polarization of light
B. Interference of light
C. Diffraction of light
D. Reflection of light
6 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
7 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
8 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller
9 A line which represents the direction of travel of a wave is known as:
A. Spherical Wavefront
B. Locus
C. Ray
D. Either B or C
10 Which one of the following phenomenon cannot be explained on the bases of Huygen's theory
A. Refraction
B. Reflection
C. Diffraction
D. Formation of spectrum

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