KVPY Government Jobs Exams

For a process to occur spontaneously
(A) only the entropy of the system must increase
(B) only the entropy of the suroundings must increase
(C) either the entropy of the system or that of the surroundings must increase
(D) the total entropy of the system and the surroundings must increase

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KVPY Other Question

The rate of gas phase chemical reactions generally increases rapidly with rise in temperature. This is mainly
because
(A) the collision frequency increases with temperature
(B) the fraction of molecules having energy in excess of the activation energy increases with temperature
(C) the activation energy decreases with temperature
(D) the average kinetic energy of molecules increases with temperature When the size of a spherical nanoparticle decreases from 30 nm to 10nm, the ratio surface area/volume
becomes
(A) 1/3 of the original (B) 3 times the original
(C) 1/9 of the original (D) 9 times the original