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

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

Question # 2

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

Question # 3

A grating with high resolving power can distinguish _______ difference in wavelengths :

Question # 4

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 # 5

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 # 6

To sources are said to be coherent if they have:

Question # 7

When the object lies between F and 2F, the image formed by is formed at:

Question # 8

The least distance of distinct vision is:

Question # 9

If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focus length of the lens will be:

Question # 10

The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:

Question # 11

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

Question # 12

Huygen principle is used to determine:

Question # 13

When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
2 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
3 Huygen's theory cannot explain
A. Diffraction
B. Interference
C. Polarization
D. Photoelectric effect
4 The distance from eye to near point is taken as:
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm
5 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
6 If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focus length of the lens will be:
A. 5 cm
B. 10 cm
C. 20 cm
D. 25 cm
7 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
8 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
9 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
10 Speed of light in vacuum depends upon:
A. Frequency
B. Wavelength
C. Amplitude
D. None of these

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