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PHYSICS [1 Mark Question Answer]

Unit - 4.1 Light And General Terms Used In Understanding Light · ICSE STD 7 (ICSE - English Medium). 12 questions.

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[1 Mark Question Answer]

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12 questions · timed · auto-graded

Question 11 Mark
By drawing neat diagrams define the following :Convergent beam of light
Answer
When light ray from different points constanly keep coming closer together and finally meet at a point, then the light beam is known as a convergent beam of light.
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Question 21 Mark
By drawing neat diagrams define the following :Parallel beam of light
Answer
When Rays from a distant point source travel parallel to each other in a particular direction, it forms a parallel Light Beam.
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Question 31 Mark
By drawing neat diagrams define the following : Ray of light
Answer
The light traveling in any one direction in a straight line is called a ray of light. A group of light rays given out from a source is called a beam of light.
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Question 51 Mark
By giving three examples define the following terms : Translucent material
Answer
oily paper, tissue, some plastics,
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Question 71 Mark
By giving three example define artificial sources of light.
Answer
Bulb, candles, torches are some of the examples of artificial sources of light.
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Question 81 Mark
Given below statement is incorrect. Write the correct statement :
When a ray of light starting from a point travels in various directions, the collection of such rays is called convergent beam of light.
Answer
When a ray of light starting from a point travels in various directions, the collection of such rays is called divergent beam of light.
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Question 91 Mark
Given below statement is incorrect. Write the correct statement :
The path along which the light energy travels in a given direction is called a beam of light.
Answer
The path along which the light energy travels in a given direction is called a ray of light.
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Question 101 Mark
Given below statement is incorrect. Write the correct statement :
Moon is a luminous body.
Answer
Moon is a non-luminous body.
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Question 111 Mark
Given below statement is incorrect. Write the correct statement :
Air is an opaque body.
Answer
Air is always transparent.
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Question 121 Mark
Given below statement is incorrect. Write the correct statement :
Stars are non-luminous body.
Answer
Stars are luminous body.
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[1 Mark Question Answer] - PHYSICS STD 7 Questions - Vidyadip