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

00:00
Question # 1

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

Question # 2

Huygen principle is used to determine:

Question # 3

Light appears to travel in straight line because

Question # 4

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

Question # 5

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

Question # 6

Stars twinkle due to

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

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

Question # 9

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

Question # 10

The contrast in the fringes in an interference pattern depends upon

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

To sources are said to be coherent if they have:

Question # 15

The wave nature of light was proposed by:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
2 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
3 A ray passing through optical center of a lens, after refraction:
A. Passes through focus
B. Go deviated
C. Retraces its path
D. Both B and C
4 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
5 The appearance of the colour in the soap (oil) film results from:
A. Dispersion
B. Interference
C. Reflection
D. Refraction
6 The locus of all the points in the same phase of vibration is called:
A. Wave packet
B. Wave front
C. Wave number
D. None of them
7 If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity
A. Fringe width will decrease
B. Fringe width will increase
C. Fringe width will remain unchanged
D. Fringe will become less intense
8 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None of these
9 Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:
A. 6 x 10-5rad
B. 7 x 10-5rad
C. 8 x 10-5rad
D. None of these
10 Electromagnetic waves transport:
A. Energy only
B. Momentum only
C. Both A and B are correct
D. None of is correct

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