ThePrismSolutions

ThePrismSolutions

DAILY PRACTICE PAPER(15Th June 2018)


(1) Specific resistance of a wire depends on the

(a) length of the wire
(b) area of cross-section of the wire
(c) resistance of the wire
(d) material of the wire

(2) A cross-section area of a copper wire is 3 × 10-6m2.The current of 4.2 amp is flowing through it. The current density in amp/m2 through the wire is

(a) 1.4 × 103   (b) 1.4 × 104
(c) 1.4 × 105   (d) 1.4 × 106

(3) The resistance of some substance becomes zero at very low temperature ,then these substance are called -

(a) good conductors    (b) super conductors
(c) bad conductors     (d) semi conductors

(4) The resistance of wire is 20Ω.The wire is stretched three times its length. Then the resistance will now becomes


(a) 6.67Ω    (b) 60Ω
(c) 120Ω    (d) 180Ω



(5) The dimensions of a mangnin block are 1cm × 1cm × 100cm. The electrical resistivity of mangnin is 4.4 × 10-7 ohm-meter .The resistance between the opposite rectangular faces is

(a) 4.4 10-7 Ω    (b) 4.4 10-3
(c) 4.4 10- Ω     (d) 4.4 10-7



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