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

Monochromatic light means waves of:

Question # 2

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

Question # 3

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

Question # 4

The least distance of distinct vision is:

Question # 5

Which one of the following can act approximately as a source of monochromatic light;

Question # 6

According to Huygen's principle

Question # 7

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

Question # 8

Laws of reflection and refraction can also be explained by:

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 an interference pattern of Young's double slit(YDS) experiment:

Question # 11

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 # 12

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 # 13

The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:

Question # 14

Resolving power in mth order diffraction for grating is given by:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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:
A. Double the size
B. Same size
C. Half the size
D. None of these
2 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
3 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
4 If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity
A. Fringe width will decrease
B. Fringe width will increase
C. Fringe width will remain unchanged
D. Fringe will become less intense
5 Huygen principle is used to determine:
A. Speed of light
B. Location of wavefront
C. About polarized or unpolarized light
D. None of them
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 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
8 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
9 In an interference pattern of Young's double slit(YDS) experiment:
A. Bright fringesare wider than dark fringes
B. Dark fringes are wider than bright fringes
C. Both dark and bright fringes are of equal width
D.

Central fringes are wider than the outer fringes
10 When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:
A. Greater, smaller
B. Smaller, smaller
C. Smaller, larger
D. Greater, larger

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