Current Electricity Mock Tests

A wire of resistance R is cut into two equal parts. The resistance of each part is:

Two resistors of 4 Ω and 6 Ω are connected in parallel. The equivalent resistance is:

A circuit consists of a 10 V battery connected in series with three resistors: R1 = 2 ohm, R2 = 3 ohm, and R3 = 5 ohm. The potential difference across R2 is:

In a meter bridge, the null point is at 40 cm from the left end. When a 24 Ω resistor is connected in parallel with the right gap resistance, the null point shifts to 50 cm. The left gap resistance is:

A Wheatstone bridge has arms AB = 10 Ω, BC = 15 Ω, AD = 20 Ω, DC = 30 Ω. A 6 V battery is connected across AC and a galvanometer across BD. The current through the galvanometer is:

A battery of emf E and internal resistance r is connected to a variable external resistance R. The current is maximum when:

The drift speed of electrons in a copper wire of diameter 2 mm carrying a current of 2 A is approximately: (Number density of free electrons in copper n = 8.5 × 10²⁸ m⁻³, e = 1.6 × 10⁻¹⁹ C)

A 100 W, 200 V electric bulb is connected to a 200 V supply. The current drawn by the bulb is: