SRM University 2007 B.Tech MODEL - Question Paper

(c) neutrons but various number of protons
(d) protons but various number of electrons
22. The mass defect in a nuclear fusion reaction is 0.3%. What amount of energy will be
liberated in 1 kg fusion reaction?
(a) 2.7×1014 Joule
(b) 27×103 Joule
(c) 2.7×102 Joule
(d) 7.2×1014 Joule
23. In pure germanium, the Fermi level is about
(a) half way in the forbidden gap
(b) just beneath the conduction band
(c) just above the valence band
(d) just above the acceptor level
24. The number densities of electrons and holes in pure Si at 27°C are equal and its value is
2.0×1016m-3. On doping with Indium, the hole density increases to 4.3×1022m-3, obtain the
electron density in doped Si.
(a) 18.89×109m-3
(b) 889×109m-3
(c) 8.89×1022m-3
(d) 8.89×109m-3
25. De-Morgan’s theorem m A + B =
(a) A+B
(b) A + B
(c) A .B
(d) A + B
PART two – CHEMISTRY
26. Combustion reaction are always,
(a) endothermic
(b) not affected by temperature modifications
(c) exothermic
(d) accompanying with heat absorption.
27. Calorific values of fuels can be determined from
(a) enthalpies of neutralization
(b) enthalpies of combustion
(c) enthalpies of formation
(d) enthalpies of fusion
28. Which of the subsequent relationship for the relation C (gr) + ½ O2? CO2(g) is corrent
(a) ? H = ? E – ½ RT
(b) ? H = ? E + ½ RT
(c) ? E = ? H
(d) ? E = ? H – ½ RT
29. For gaseous reaction ?H and ? E are related as,
(a) ? H = ? E
(b) ? H = ? E – RT ?n(g)
(c) ? H = ? E + RT ?n(g)
(d) ? E = ? E – (RT)?n
30. Hess’s legal regulations deals with,
(a) Heat modifications accompanying a chemical process
(b) Rates of chemical reaction
(c) Equilibrium constant of a reaction
(d) Influence of temperature on a reaction
31. The relation ranging from equilibrium constant KC and the rate constant Kf , Kb is,

Earning:   Approval pending.