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

According to Huygen's principle

Question # 2

Wave length of light, on the average, is given by:

Question # 3

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 # 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:

Question # 5

Monochromatic light means waves of:

Question # 6

Light appears to travel in straight line because

Question # 7

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:

Question # 8

The wave nature of light was proposed by:

Question # 9

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

Question # 10

Huygen's theory cannot explain

Question # 11

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called

Question # 12

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

Question # 13

To sources are said to be coherent if they have:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 The image of the tip of a needle is never sharp because of
A. Polarization of light
B. Interference of light
C. Diffraction of light
D. Reflection of light
3 To observe interference of light, the condition, which must be met with is that the sources must be:
A. Monochromatic
B. Phase coherent
C. Both of above
D. None of above
4 The ratio of the size of the image to that of object is called:
A. Focal length
B. Aperture
C. Linear magnification
D. Principal axis
5 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
6 The terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these
7 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
8 The locus of all points in a medium having same phase of vibration is called
A. Crest
B. Trough
C. Wavelength
D. Wave-front
9 The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:
A. Greater than
B. Less than
C. Equal to
D. None of these
10 Which one of the following phenomenon cannot be explained on the bases of Huygen's theory
A. Refraction
B. Reflection
C. Diffraction
D. Formation of spectrum

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