ThePrismSolutions

ThePrismSolutions

DAILY PRACTICE PAPER(18Th June 2018)


(1) If the temperatures of iron and silicon wires are increased from 30°C to 50° C, the correct statement is -

(a) resistance of both wires increase
(b) resistance of both wires decrease
(c) resistance of iron increases and resistance of silicon decreases
(d) resistance of iron decreases and resistance of silicon increases

(2) When the resistance of copper wire is 0.1Ω and radius is 1 mm ,then the length of wire is (Spec. resistance = 3.14 × 10-8 Ω-m)

(a) 10 cm     (b) 10 m
(c) 100 cm     (d) 100 m

(3) When the resistance wire is passed through a die the cross-section area decreases by 1 % , the change in resistance of the wire is

(a) 1% decrease     (b) 1% increase
(c) 2% decrease     (d) 2% increase

(4) When the temperature of a metallic conductor is increased its resistance -


(a) always increases     (b) always decreases
(c) remains tha same.   (d) may increase or decrease



(5) In which one of the following substance the resistance decrease with increase in temperature

(a) carbon     (b) constantan
(c) copper     (d) silver



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