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Question-1
The negative Zn pole of a Daniel cell, sending a constant current through a circuit, decreases in mass by 0.13 g in 30 minutes. If the electrochemical equivalent of Zn and Cu are 32.5 and 31.5 respectively, the increase in the mass of the positive Cu pole in this time is

(A) 0.180 g	(B) 0.141 g
(C) 0.126 g	(D) 0.242 g

Question-2
The masses of the three wires of copper are in the ratio of 1:3:5 and their lengths are in the ratio of 5:3:1. The ratio of their electrical resistance is

(A) 1:3:5	(B) 5:3:1
(C) 1:25:125	(D) 125:15:1

Question-3 The mean free path of electrons in a metal is . The electric field which can give on an average 2 eV energy to an electron in the metal will be in unit of Vm^-1

(A)	(B)
(C)	(D)

Question-4 The current in the following circuit is

(A) 1 A	(B)
(C)	(D)

Question-5
The resistor R₁ dissipates power P, when connected to a generator. If a resistor R₂ is inserted in series with R₁, the power dissipated by R₁

(A) increases	(B) decreases
(C) remains the same	(D) may increase or decrease depending on the value of R₁ and R₂

Question-6 Two 220V, 100 W bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 V AC supply line. The power drawn by the combination in each case respectively will be

(A) 200 W, 150 W	(B)50 W, 200 W
(C)50 W, 100 W	(D)100 W, 50 W

Question-7
In the circuit shown, the current through the resistor is 1 A when the points P and M are connected to a dc voltage source. The potential difference between the points M and N is

(A) 1.5 V	(B)1.0 V
(C)0.5 V	(D)3.2 V

Question-8 Forty electric bulbs are connected in series across a 220 V supply. After one bulb is fused the remaining 39 are connected again in series across the same supply. The illumination will be

(A) more with 40 bulbs than with 39	(B)more with 39 bulbs than with 40
(C)equal in both the cases	(D)in the ratio 40² : 39²

Question-9
The temperature of inversion of a thermocouple is 620^o C and the neutral temperature is 300^o C. What is the temperature of cold junction ?

(A) 20^o C	(B) 320^o C
(C) -20^o C	(D) 40^o C

Question-10 A heating coil is labelled 100 W, 220 V. The coil is cut in two equal-halves and the two pieces are joined in parallel to the same source. The energy now liberated per second is

(A) 25 J	(B)50 J
(C)200 J	(D)400 J

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Plus 2 Computer Science

ICSE/ISC

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