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 least distance of distinct vision is:

Question # 2

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

Question # 3

With age, least distance of distinct vision:

Question # 4

Which one of the following can act approximately as a source of monochromatic light;

Question # 5

To observe interference of light, the condition, which must be met with is that the sources must be:

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

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 # 10

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

Question # 11

The contrast in the fringes in an interference pattern depends upon

Question # 12

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:

Question # 13

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

Question # 14

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 # 15

The velocity of light in vacuum can be changed by changing

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 With age, least distance of distinct vision:
A. Increases
B. Decreases
C. Is not affected
D. None is correct
2 When the object lies between F and 2F, the image formed by is formed at:
A. Virtual
B. Diminished
C. Erect
D. Real
3 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
4 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
5 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m
6 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
7 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller
8 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
9 Huygen's theory cannot explain
A. Diffraction
B. Interference
C. Polarization
D. Photoelectric effect
10 The appearance of the colour in the soap (oil) film results from:
A. Dispersion
B. Interference
C. Reflection
D. Refraction

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