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

Question # 2

Light appears to travel in straight line because

Question # 3

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

Question # 4

The locus of all the points in the same phase of vibration is called:

Question # 5

With age, least distance of distinct vision:

Question # 6

Resolving power in mth order diffraction for grating is given by:

Question # 7

Laws of reflection and refraction can also be explained by:

Question # 8

The appearance of the colour in the soap (oil) film results from:

Question # 9

When a source of light isat very large distance,the shape of wavefront is:

Question # 10

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

Question # 11

The magnifier forms a virtual image of the object at:

Question # 12

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 # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 The locus of all points in a medium having same phase of vibration is called
A. Crest
B. Trough
C. Wavelength
D. Wave-front
2 Wave length of that color as compared to that of violet color is:
A. Smaller
B. Longer
C. Equal
D. None of these
3 Light appears to travel in straight line because
A. It is not absorbed by the atmosphere
B. It is refracted by the atmosphere
C. Its wavelength is very small
D. Its velocity is very large
4 Huygen's theory cannot explain
A. Diffraction
B. Interference
C. Polarization
D. Photoelectric effect
5 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
6 The velocity of light in vacuum can be changed by changing
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
7 A magnifier gives an image which is:
A. Virtual, inverted
B. Real, erect
C. Virtual, erect
D. Real, inverted
8 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
9 Electromagnetic waves transport:
A. Energy only
B. Momentum only
C. Both A and B are correct
D. None of is correct
10 The magnifier forms a virtual image of the object at:
A. None of these
B. Least distance of distinct vision
C. Much farther than the least distance
D. Both A and B are correct

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