ECAT Pre Engineering Physics Chapter 9 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 9 Physical Optics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 9 Physical Optics

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Physics ECAT Pre Engineering Chapter 9 Physical Optics

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Question # 1

The distance from eye to near point is taken as:

Question # 2

Speed of light in vacuum depends upon:

Question # 3

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

Question # 4

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

Question # 5

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 # 6

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

Question # 7

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 # 8

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

Question # 9

The terms phase difference and path difference are:

Question # 10

Laws of reflection and refraction can also be explained by:

Question # 11

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

Question # 12

Electromagnetic waves transport:

Question # 13

In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:

Question # 14

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

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 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
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. 5 cm
B. 20 cm
C. 10 cm
D. 15 cm
3 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
4 A magnifier gives an image which is:
A. Virtual, inverted
B. Real, erect
C. Virtual, erect
D. Real, inverted
5 Resolving power in mth order diffraction for grating is given by:
A. R = N x m
B. None of these
C. R = m/N
D. R = N/m
6 The magnifier forms a virtual image of the object at:
A. None of these
B. Both A and B are correct
C. Much farther than the least distance
D. Least distance of distinct vision
7 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
8 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
9 How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:
A. The upper half of the image is cut off
B. The brightness of the image is reduced
C. The brightness of the image is increased
D. No effect at all
10 The velocity of light in vacuum can be changed by changing
A. Frequency
B. Amplitude
C. Wavelength
D. None of these

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