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Question-1 Three resistance P,Q,R each of and an unknown resistance S from the four arms of a Wheatstone's bridge circuit. When a resistance of is connected in parallel to S the bridge gets balanced. What is the value of S ?

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

Question-2 A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively with and without being short circuited through a resistance of . Its internal resistance is

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

Question-3
In electrolysis the mass deposited on an electrode is directly proportional to

(A) current	(B) square of current
(C) concentration of solution	(D) inverse of current

Question-4 Resistivity of potentiometer wire is and its area of cross-section is . When a current i = 0.1 A flows through the wire, its potential gradient is

(A) 10^-2 V/m	(B)10^-4 V/m
(C)0.1 V/m	(D)10 V/m

Question-5 Current through resistor is 0.8A, then potential drop through resistor is

(A) 9.6 V	(B)2.6 V
(C)4.8 V	(D)1.2 V

Question-6
The velocity of charge carriers of current(about 1A) in a metal under normal conditions is of the order of

(A) a fraction of mm/s	(B) velocity of light
(C) several thousand m/s	(D) a few hundred m/s

Question-7 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

Question-8
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-9
In a potentiometer of 10 wires, the balance point is obtained on the 7th wire. To shift the balance point to 9th wire, we should

(A) decrease resistance in the main circuit	(B) increase resistance in series with circuit
(C) decrease resistance in series with the cell whose emf is to be measured	(D) increase resistance in series with the cell whose emf is to be determined

Question-10 When three identical bulbs of 60 W, 200 V rating are connected in series to a 200 V supply, the power drawn by them will be

(A) 60 W	(B)180 W
(C)10 W	(D)20 W

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Plus 2 Biology Science

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