NEET Free Online Mock Test - 2019

NEET Physics  Radiation  Practice Q & A

1. Heat energy received by the earth from the sun is due to

Convection Radiation Reflection of light Transmission of light

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2. Two stars A and B radiate maximum energy at 3600Å and 3600Å respectively. Then the ratio of absolute temperatures of A and B is

256: 81 81: 256 3: 4 4: 3

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3. In which process the rate of transfer of heat is maximum?

Conduction Convection Radiation In all these heat is transferred with the same velocity

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4. Solar radiation emitted by sun resembles that emitted by a black body at a temperature of 6000 K. maximum intensity is emitted at a wavelength of about 4800 Å. if the sun were cooled down from 6000 K to 3000 K, then the peak intensity would occur at a wavelength of

4800 Å 9600 Å 2400 Å 19200 Å

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5. emissivity of perfectly black body is

1 2 5 0

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6. Absorptive power of perfectly black body is

Zero Infinity One Constant

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7. The earth intercepts approximately one billionth of the power radiated by the sun. if the surface temperature of the sun were to drop by a factor of 2, the average radiant energy incident on earth per second would reduce by factor of

2 4 8 16

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8. If the temperature of the sun is doubled. The rate of energy received on the earth will be increased by a factor of

2 4 8 16

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9. A body in a room cools from 90°C to 80°C in 5 minutes. the time taken to cool from 70°C to 60°C is

Less than 5 minute 5 minute More than 5 minutes Less or more than 5 minutes depending upon the nature of the body

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10. The process of heat transfer in which heat is transferred with actual migration of medium particles is known as

Conduction Convection Radiation Reflection

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