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Question-1 There are three copper wires of length and cross-sectional area (L,A), (2L, (1/2A), (1/2L,2A). In which case is the resistance minimum ?

(A) It is the same in all three cases	(B)Wire of cross-sectional area 2A
(C)Wire of cross-sectional area A	(D)Wire of cross-sectional area

Question-2
A storage battery is connected to the mains for charging with emf of 12.5 V. The internal resistance of the storage battery is 1 Ω. When the charging current is 0.5 A, the potential difference across the storage battery is

(A) 13 V	(B) 12.5 V
(C) 12 V	(D) 11.5 V

Question-3 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-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 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-6 The total power dissipated in watts in the circuit shown here is
18V

(A) 16	(B)40
(C)54	(D)4

Question-7 For a cell the terminal potential difference is 2.2 V when circuit is open and reduces to 1.8V when cell is connected to a resistance the internal resistance (r) of cell is

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

Question-8 In producing chlorine through electrolysis 100 W power at 125 V is being consumed. How much chlorine per minute is liberated ? (ECE of chlorine is )

(A) 17.6 mg	(B)21.3 mg
(C)24.3 mg	(D)13.6 mg

Question-9 A steady current of 1.5 A flows through a copper voltameter for 10 min. If the electrochemical equivalent of copper is , the mass of copper deposited on the electrode will be

(A) 0.40 g	(B)0.50 g
(C)0.67 g	(D)0.27 g

Question-10
Four bulbs marked 40 W, 250 V are connected in series with 250 V mains, the total power consumed is

(A) 10 W	(B) 40 W
(C) 320 W	(D) 160 W

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Plus 2 Computer Science

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