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In meter-bridge the balancing length from left is found to be 20 cm when standard resistance of 1 Ω is in right gap. The value of unknown resistance is
(a) 0.25Ω (b) 0.4 Ω
(c) 0.5 Ω (d) 4 Ω

Kirchhoff’s first law, ie, ∑I = 0 at a junction, deals with the conservation of
(a) Angular momentum
(b) Linear momentum
(c) Energy
(d) Charge

A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/Quantities constant along the length of the conductor is/are
(a) Current, electric field and drift speed
(b) Drift speed only
(c) Current and drift speed
(d) Current only

A piece of copper and another of germanium are cooled from room temperature to 80 k. The resistance of
(a) Each of them increases
(b) Each of them decreases
(c) Copper increases and germanium decreases
(d) Copper decreases and germanium increases

A 4µF capacitor and a resistance of 2.5 MΩ are in series with 12 V battery. Find the time after which the potential difference across the capacitor is 3 times the potential difference
Across the resistor. [Given, in (2) = 0.693]
(a) 13.86 s (b) 6.93 s
(c) 7 s (d) 14 s

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