6. Luminous intensity of a source is defined as

1. 1. Light energy emitted by the same source per unit time

   
   
   

   2. Light energy emitted by the source per unit time per unit area

   
   
   

   3. Light energy emitted by the source per unit time per unit solid angle

   
   
   

   4. None of the above

   
   
   

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   N/A

   Correct Option: C

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7. The illumination from the sun is greater at noon than in the evening because

1. 1. The sun is brighter at noon

   
   
   

   2. The sun is nearer to the earth at noon

   
   
   

   3. The rays of the sun are less oblique at noon that in the morning

   
   
   

   4. None of the above

   
   
   

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   N/A

   Correct Option: C

   N/A

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8. Two plane mirrors are inclined at 70°, A ray incident on one mirror at angle 0. After reflection, falls on the second mirror and is reflected from there parallel to the first mirror 0 is.

1. 1. 50°

   
   
   

   2. 45°

   
   
   

   3. 30°

   
   
   

   4. 55°

   
   
   

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   N/A

   Correct Option: A

   N/A

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9. A concave mirror forms the image of an object on a screen. If the lower half of the mirror is covered with an opaque card, the effect would be

1. 1. To make the image less bright

   
   
   

   2. To make the lower half of the image disappear

   
   
   

   3. To make the upper half of the image disappear

   
   
   

   4. To make the image blurred

   
   
   

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   N/A

   Correct Option: A

   N/A

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10. A number of images of a candle flame are seen in thick mirror

1. 1. The first image is the brightest

   
   
   

   2. The second image is the brightest

   
   
   

   3. The last image is the brightest

   
   
   

   4. All Images are equally brightest

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: B

   N/A

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