Overexposure of ultravoilet radiations can cause:

1. skin cancer
2. sunburns
3. cataract
4. All of these
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Answer: D
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Which rays coming from the sun cause our skin to burn?

1. ultravoilet rays
2. Visible light
3. gamma rays
4. Radio waves
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Answer: A
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Which radiation is emmitted by everything from fireflies to light bulbs to stars;

1. ultravoilet rays
2. Visible light
3. gamma rays
4. Radio waves
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Answer: B
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Visible radiations are emmitted by;

1. light bulbs
2. excited atoms and molecules
3. sun
4. all of these
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Answer: D
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Visible radiations are used in;

1. vision
2. optical instruments
3. photography
4. all of these
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Answer: D
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Which radiation enable us to see?

1. ultravoilet
2. Visible
3. gamma rays
4. I.R rays
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Answer: B
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Which radiation after passing through a prism is dispersed into seven colours?

1. ultravoilet rays
2. Visible light
3. gamma rays
4. Radio waves
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Answer: B
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How many colours does visible spectrum include?

1. 5
2. 1
3. 7
4. 8
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Answer: C
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Different colours of rainbow are seen due to spectrum of:

1. ultravoilet rays
2. Visible light
3. gamma rays
4. I.R rays
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Answer: B
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of the waves that make up visible light, which colour has longest wavelength?

1. Red
2. blue
3. violet
4. yellow
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Answer: A
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