11-In any nuclear reaction, the reactants and the resultants must always be in conformity with the law of conservation of
(A) energy
(B) charge number
(C) mass number
(D) charge number and mass number
12-The device in which negative feedback is used is
(A) rectifier
(B) amplifier
(C) RC oscillator
(D) crystal oscillators
13-Which instrument can be used to study the penetrating ability of X-rays?
(A) Wilson cloud chamber
(B) Diffusion cloud chamber
(C) Ionization chamber
(D) Bubble chamber
14-In a CE transistor amplifier circuit, the base current is 0.1 A and the gain is 100. Calculate the collector current?
(A) 0.1 A
(B) .1 A
(C) 10 A
(D) 100 A
15-Empirical formula for the nuclear radius is
(A) R = roA1/3
(B) R = ro
(C) R = roA-1/3
(D) R = roA1/2
16-Justify the following statement with the given option.
Emitters base junction is forward biased and collector base junction is reverse biased
(A) collector base junction is thin
(B) emitter-base junction should be low resistance and collector base high resistance
(C) emitter base junction is wider
(D) emitter base is with high potential
17-In photoelectric effect, the relation between the maximum energy of emission and the frequency of light is
(A) Parabolic
(B) Exponential
(C) Hyperbolic
(D) Linear
18-Thermo electric power is given by
(A) dT/dE
(B) d2T/d2E
(C) dE/dT
(D) -dT/dE
19-Planck’s formula reduces to Rayleigh Jean’s formula for
(A) high energy radiations
(B) absolute temperature
(C) shorter wavelengths
(D) longer wavelengths
20-A metal for which Thomson coefficient is zero
(A) lead
(B) copper
(C) iron
(D) nickel
ANSWERS:
11-(D), 12-(B), 13-(C), 14-(C), 15-(A), 16-(B), 17-(D), 18-(C), 19-(D), 20-(A)