Physics Practice Test – Current Electricity and Electric Charges

Hello and Welcome to Physics Practice Tests - Current Electricity and Electric Charges

1. You are to attempt 5 random objectives questions ONLY.
2. Supply Your Full Name and Location in the text box below and begin immediately.
3. You can attempt as many times as possible
1.

An electric lamp rated 120 W is used on a 240 Vrms, calculate the resistance of its filament.

A. 480 Ω     B. 360 Ω     C. 60 Ω     D. 2 Ω

2.

The ability of a material to store an electric charge when its plates are at different potentials is referred to as its ______

A. conductance    B. inductance    C. capacitance    D. resistance

3.

A cell of e.m.f. 1.5 V and internal resistance 1.0 Ω is connected to two resistors of resistances 2.0 Ω  and 3.0 Ω in series. Calculate the current through the resistors.

A. 0.25 A     B. 0.30 A     C. 0.35 A     D. 0.50 A

4.

A wire of resistivity 4.40 x 10-5 Ω cm has a cross sectional area of 7.50 x 10-4  cm-2. Calculate the length of this wire that will be required to make a 4.0 Ω resistor.

A. 82.50 cm   B. 68.18 cm    C. 15.90 cm    D. 11.94 cm

5.

Five 80-W and three 100-W lamps are run for 8 hours. If the cost of energy is N 5.00 per unit, calculate the cost of running the lamps. [1 unit = 1 kWh]

A. N 280.00     B. N 28.00     C. N 7.20     D. N 1.44.

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