Newton's Law of Cooling(Thermal Radiation) (Viva Voce) : Class 11 : Physics : Amrita Online Lab

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Newton's Law of Cooling(Thermal Radiation)

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	1)	Define temperature of a body?
		Temperature is the degree of hotness of a body. None of these Temperature is the degree of coldness of a body. Both a and b are correct.

	2)	Which is the law that explains the relation of cooling of a body with its surrounding temperature?
		Newton’s Law of Cooling Kirchhoff’s Law Newton’s Laws of Motion Stefan’s Law

	3)	Name the process which cannot be retraced in the reverse direction?
		Irreversible process Adiabatic process Isothermal process Reversible process

	4)	Which of the following is the correct statement?
		The rate of cooling of a hot body is equal to the sum of the temperature between the body and surrounding. The rate of cooling of a hot body is inversely proportional to the sum of the temperature between the body and surrounding. The rate of cooling of a hot body is directly proportional to the difference of temperature between the body and surrounding. The rate of cooling of a hot body is directly proportional to the sum of the temperature between the body and surrounding.

	5)	What is meant by the rate of cooling?
		Rise in temperature of a body per hour Difference between the initial and final temperatures of a body Fall in temperature of a body per second. Rise in temperature of a body per second

	6)	What is the shape of the Time Vs Temperature graph of a hot body cooling under normal temperature?
		The graph is a hyperbola. The shape depends on the material of the body under cooling. None of these. The graph is a straight line.

	7)	What is the significance of Newton’s cooling curve?
		The rate of cooling of a hot body is inversely proportional to surrounding temperature. a. The temperature of a hot body shows a uniform rate of cooling. The rate of cooling decreases as the difference of temperature between the body and surrounding decreases. The body cools very slowly if there is a wide difference in temperature of the body with the surroundings.

	8)	Choose the correct relation from the following?
		dT/dt ∝ [T-T(0)] Both b and c are correct. dT/dt = [T-T(0)]

	9)	Two identical bodies of temperature 800C are kept in two containers of temperatures 100C and 600C respectively. Which among them cools first?
		Body in low temperature surrounding Body in high temperature surrounding Both of them shows the same rate of cooling None of these

	10)	Express Newton’s Law of Cooling in mathematical form?
		E ∝ [T-T(0)] Both explains Newton’s law of cooling E ∝ T^4 None of these

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