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

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

Question # 2

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

Question # 3

According to Huygen's principle

Question # 4

Light appears to travel in straight line because

Question # 5

For the virtual image, option _______ is not correct:

Question # 6

Huygen principle is used to determine:

Question # 7

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

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

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called

Question # 10

Laws of reflection and refraction can also be explained by:

Question # 11

A line which represents the direction of travel of a wave is known as:

Question # 12

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

Question # 13

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

Question # 14

The least distance of distinct vision is:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 Which one of the following can act approximately as a source of monochromatic light;
A. Neon lamp
B. Fluorescent tube
C. Sodium lamp
D. None of these
4 A convex lens acts as diverging lens when the object is placed:
A. Beyond 2F
B. At 2F
C. With focal length
D. Between F and 2F
5 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:
A. 6 x 10-5rad
B. 7 x 10-5rad
C. 8 x 10-5rad
D. None of these
6 Huygen's theory cannot explain
A. Diffraction
B. Interference
C. Polarization
D. Photoelectric effect
7 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller
8 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
9 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
10 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them

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