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

Question # 2

Stars twinkle due to

Question # 3

To sources are said to be coherent if they have:

Question # 4

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

Question # 5

A magnifier gives an image which is:

Question # 6

The cause of mirage observed in deserts in bright sunlight is due to

Question # 7

The property of light which does not change with the nature of the medium is:

Question # 8

The magnifier forms a virtual image of the object at:

Question # 9

The least distance of distinct vision is:

Question # 10

According to Huygen's principle

Question # 11

Light has:

Question # 12

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

Question # 13

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

Question # 14

Monochromatic light means waves of:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m
2 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
3 In case of point, source of light shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
4 The least distance of distinct vision is:
A. 10 cm
B. 25 cm
C. 50 cm
D. 100 cm
5 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
6 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
7 A virtual image is formed when object is placed:
A. Within focal length of a convex lens
B. Near the focal point of a concave lens
C. Both A and B
D. Away from 2F of a convex lens
8 In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:
A. Greater than
B. Smaller than
C. Equal to
D. None of these
9 The locus of all points in a medium having same phase of vibration is called
A. Crest
B. Trough
C. Wavelength
D. Wave-front
10 The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
A. 1
B. 0.2
C. 2
D. 0.1

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