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 virtual image is formed when object is placed:

Question # 2

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

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

Question # 5

Light has:

Question # 6

The magnifier forms a virtual image of the object at:

Question # 7

Speed of light in vacuum depends upon:

Question # 8

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

Question # 9

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

Question # 10

The locus of all points in a medium having same phase of vibration is called

Question # 11

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 # 12

Least distance of distinct vision of an old man possibly becomes:

Question # 13

Wave length of light, on the average, is given by:

Question # 14

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

Question # 15

Huygen's theory cannot explain

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 Frequency of red color as compared to that of violet color is:
A. Equal
B. Smaller
C. Greater
D. None of these
3 According to Huygen's principle
A. light travels in straight line
B. Light is a transvers wave
C. Light has dual nature
D. All points on the primary wave-front are the sources of secondary wavelets
4 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
5 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
6 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
7 The ratio of the size of the image to that of object is called:
A. Focal length
B. Aperture
C. Linear magnification
D. Principal axis
8 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
9 In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.
A. Bright
B. Dark
C. Any of A and B
D. None of these
10 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these

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