रस

34.

38.

36.

37.

38.

39.

Which of the following processes is used to harden the steel?
(A) normalizing (B) annealing

(C) carburizing (D) quenching

Which of the following is always true for an isothermal process of an ideal gas?
(A) the pressure does not change (ए) the internal energy does not change
(C) the volume does not change (D) no heat flows into or out of the system

A heat engine takes in 200 Joule of thermal energy and performs 50 Joule of work in each
cycle. What is its efficiency?

(ல) 12% (8) 20%
(0) 25% D) 80%

1f a chemical reaction has a positive change in entropy, then :
(ക) the disorder of the system increases
(B) the reaction is exothermic
(C) heat goes from the system into the surroundings

(D) the Gibbs free energy is negative

Joule-Thomson coefficient is the slope of :
(ಗಿ) constant enthalpy lines on T-s diagram
(B) constant enthalpy lines on T-p diagram
(0) “| inversion curve on T-s diagram

(D) inversion curve on T-p diagram

Pressure reaches a value of absolute zero :
(മ at atemperature of 273 K
(8) under vacuum condition
(0) at the earth's centre

(D) when molecular momentum of system becomes zero

The mathematical technique for finding the best use of limited resources in an optimum
manner 18 known as :

(A) operation research (ए) linear programming

(C) network analysis (2) queuing theory

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