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

Laws of reflection and refraction can also be explained by:

Question # 2

The magnifier forms a virtual image of the object at:

Question # 3

A grating with high resolving power can distinguish _______ difference in wavelengths :

Question # 4

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

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

Question # 7

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

Question # 8

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

Question # 9

In order to get interference using two light rays

Question # 10

According to Huygen's principle

Question # 11

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

Question # 12

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 # 13

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

Question # 14

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

Question # 15

To see the minor details of the object by microscope, it should have:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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:
A. Double the size
B. Same size
C. Half the size
D. None of these
2 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
3 The least distance of distinct vision is:
A. 10 cm
B. 25 cm
C. 50 cm
D. 100 cm
4 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
5 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. 15 cm
B. 10 cm
C. 20 cm
D. 5 cm
6 The appearance of the colour in the soap (oil) film results from:
A. Dispersion
B. Interference
C. Reflection
D. Refraction
7 Speed of light in vacuum depends upon:
A. Frequency
B. Wavelength
C. Amplitude
D. None of these
8 In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:
A. Greater than
B. Equal to
C. Smaller than
D. None of these
9 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m
10 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

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