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Question-1 A battery of emf 10V and internal resistance 0.5 is connected across a variable resistance R. The value of R for which the power delivered in it is maximum is given by

(A) 0.5	(B)1.0
(C)2.0	(D)0.25

Question-2 The velocity of charge carriers of current (about 1 A) in a metal under normal conditions is of the order of

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

Question-3 Two identical batteries each of emf 2 V and internal resistance 1 are available to produce heat in an external resistance by passing a current through it. The maximum power that can be developed across R using these batteries is

(A) 3.2 W	(B)2.0 W
(C)1.28 W	(D)

Question-4 The current in the following circuit is

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

Question-5 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

Question-6 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-7 A 5 A fuse wire can withstand a maximum power of 1 W in circuit. The resistance of the fuse wire is

(A) 0.2	(B)5
(C)0.4	(D)0.04

Question-8
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-9
You are given several identical resistances each of value and each capable of carrying a maximum current of one ampere. It is required to make a suitable combination of these resistances of which can carry a current of 4 A. The minimum number of resistances of the type R that will be required for this job is

(A) 4	(B) 10
(C) 8	(D) 20

Question-10 A 6 V battery is connected to the terminals of a three metre long wire of uniform thickness and resistance of . The difference of potential between two points on the wire separated by a distance of 50cm will be

(A) 2 V	(B)3 V
(C)1 V	(D)1.5 V

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Plus 2 Computer Science

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