On a clear sunny day, an object at temperature T is placed on the top of a high mountain. An identical object at the same temperature is placed at the foot of mountain. If both the objects are exposed to sun-rays for two hours in an identical manner, the object at the top of the mountain will register a temperature

(a) Higher than the object at the foot

(b) Lower than the object at the foot

(c) Equal to the object at the foot

(d) None of the above

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Heat travels through vacuum by
(a) Conduction                  (b) Convection
(c) Radiation                     (d) Both (a) and (b)

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We consider the radiation emitted by the human body. Which of the following statements is true ?

(a) The radiation is emitted only during the day

(b) The radiation is emitted during the summers and absorbed during the winters

(c) The radiation emitted lies in the ultraviolet region and hence is not visible

(d) The radiation emitted is in the infra-red region

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The earth radiates in the infra-red region of the spectrum. The spectrum is correctly given by

(a) Wien’s law                                (b) Rayleigh  law

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Pick out the statement which is not true .

(a) IR radiations are used for long distance photography

(b) IR radiations arise due to inner electron transitions in atoms

(c) IR radiations are detected by using a bolometer

(d) Sun is the natural source of IR radiation

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A hot and a cold body are kept in vacuum separated from each other. Which of the following cause decrease in temperature of the hot body ?

(b) Convection

(c) Conduction

(d) Temperature remains unchanged

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For a perfectly black body, its absorptive power is

(a) 1                 (b) 0.5
(c) 0                  (d) Infinity

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Certain substance emits only the wavelengths  and ${\mathrm{\lambda }}_{4}$ when it is at a high temperature. When this substance is at a colder temperature, it will absorb only the following wavelengths ?
(a) ${\mathrm{\lambda }}_{1}$                      (b) ${\mathrm{\lambda }}_{2}$
(c) ${\mathrm{\lambda }}_{1}$ and ${\mathrm{\lambda }}_{2}$          (d)   and ${\mathrm{\lambda }}_{4}$

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As compared to the person with white skin, the person with black skin will experience
(a) Less heat and more cold            (b) More heat and more cold
(c) More heat and less cold             (d) Less heat and less cold

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Relation between emissivity e and absorptive power a is (for black body)
(a) e = a                     (b) $\mathrm{e}=\frac{1}{\mathrm{a}}$
(c) $\mathrm{e}={\mathrm{a}}^{2}$                     (d) $\mathrm{a}={\mathrm{e}}^{2}$

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