KVPY Government Jobs Exams

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

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KVPY Other Question

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 To obtain a diffraction peak, for a crystalline solid with interplane distance equal to the wavelength of
incident X-ray radiation, the angle of incidence should be
(A) 90º (B) 0º (C) 30º (D) 60º