12

Physics

Electricity

296+ practice questions available

Sample Practice Questions

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1
Medium

Assertion (A): Alloys are commonly used in electrical heating devices like electric irons and toasters. Reason (R): Alloys have higher resistivity than their constituent metals and do not oxidize (burn) readily at high temperatures.

ABoth A and R are true and R is the correct explanation of A
BBoth A and R are true but R is not the correct explanation of A
CA is true but R is false
DA is false but R is true
2
Easy

In a parallel circuit, the potential difference across each resistor is:

ADifferent for each resistor
BSame for all resistors
CZero
DProportional to resistance
3
Easy

The heating element of an electric iron is made of:

ACopper
BAluminium
CNichrome
DSilver
4
Medium

A battery of EMF 6 V and internal resistance 1 Ω is connected to a 5 Ω resistor. The terminal voltage of the battery is:

A6 V
B5 V
C1 V
D4 V
5
Hard

Two cells of EMF 2 V and 1.5 V with internal resistances 0.1 Ω and 0.2 Ω are connected in series (opposing) with an external 4.7 Ω resistance. The current in the circuit is:

A0.1 A
B0.7 A
C0.5 A
D1 A

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