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Question-1 The internal energy change in a system that has absorbed 2 k cal of heat and done 500 J of work is

(A) 8900 J	(B)6400 J
(C)5400 J	(D)7900 J

Question-2 A gas at a temperature of 250 K is contained in a closed vessel. If the gas is heated through 1 K, then percentage increase in its pressure is

(A) 0.1 %	(B)0.2 %
(C)0.3 %	(D)0.4 %

Question-3 Initial pressure and volume of a gas are P and V respectively. First the gas is expanded isothermally to 4V and then its volume is made V by adiabatic process. Its final pressure (γ = 1.5) is

(A) 8 P	(B)4 P
(C)P	(D)2 P

Question-4 First law of thermodynamics is a consequence of conservation of

(A) Work	(B)Energy
(C)Heat	(D)All of these

Question-5 Wien's law states that :

(A) T + λ_m = constant	(B)λ_m T= constant
(C)λ_m/T = constant	(D)T^₄/ λ_m = constant

Question-6
What is the absolute mass of an atom of oxygen? Atomic mass of oxygen is 16 and Avogadro's number =

(A)	(B)
(C)	(D)

Question-7 A Carnot engine whose sink is at 300 K has an efficiency of 40%. By how much should the temperature of source be increased so as to increase its efficiency by 50% of original efficiency?

(A) 275 K	(B)325 K
(C)250 K	(D)380 K

Question-8 540 g of ice at 0^o C is mixed with 540 g of water at 80^o C. The final temperature of the mixture is

(A) 40^o C	(B)79.9^o C
(C)80^o C	(D)0^o C

Question-9 A black body radiates heat energy at the rate of 2 × 10⁵ J/s/m² at a temperature of 127°C. The temperature of black body at which the rate of radiation is 32 × 10⁵ J/s/m² is

(A) 273°C	(B)527°C
(C)873°C	(D)927°C

Question-10 A vessel contains 1 mole of O₂ gas (molar mass 32) at temperature T. The pressure of the gas is P. An identical vessel containing one mole of He (molar mass 4) at a temperature 2T has a pressure of

(A) P/8	(B)P
(C)8P	(D)2P

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Plus 1 Computer Science

Tamil Nadu (English Medium)

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