Sainik School New pattern Class IX
Defence Academy Coimbatore
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Question 1
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Question: Light is a form of energy produced by a ______.
1. | luminous object |
2. | transparent object |
3. | non-luminous object |
4. | opaque object |
Answer: 1
Question 2
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Question: An example for non-luminous object is ___________.
1. | a candle |
2. | the sun |
3. | an electric bulb |
4. | the moon |
Answer: 4
Question 3
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Question: The phenomenon by which the incident light falling on a surface is sent back into the same medium is known as ________.
1. | polarization |
2. | reflection |
3. | refraction |
4. | absorption |
Answer: 2
Question 4
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Question: When light is incident on a polished surface ___________ reflection takes place.
1. | regular |
2. | irregular |
3. | diffused |
4. | normal |
Answer: 1
Question 5
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Question: An object becomes invisible when it undergoes ______ reflection.
1. | regular |
2. | irregular |
3. | diffused |
4. | normal |
Answer: 1
Question 6
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Question: According to the laws of reflection,
1. | i = r |
2. | i > r |
3. | r > i |
4. |
Answer: 1
Question 7
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Question: The image formed by a plane mirror is always _______.
1. | real and erect |
2. | virtual and erect |
3. | real and inverted |
4. | virtual and inverted |
Answer: 2
Question 8
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Question: The centre of the sphere of which the spherical mirror forms a part is called ____________.
1. | centre of curvature |
2. | focus |
3. | pole |
4. | vertex |
Answer: 1
Question 9
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Question: The focus of a concave mirror is ________.
1. | real |
2. | virtual |
3. | undefined |
4. | at the pole |
Answer: 2
Question 10
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Question: A converging mirror is known as ________.
1. | convex mirror |
2. | plane mirror |
3. | concave mirror |
4. | cylindrical mirror |
Answer: 3
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