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JEE • PHYSICS • CURRENT ELECTRICITY

Current electricity practice · Easy

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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1 Easy

1 of 14

Application +4 | -1

A potentiometer consist of a wire of length 2m and resistance . It is connected to an ideal cell of e.m.f 4V. The potential difference per unit length of the wire will be

View answer and explanation

Correct option: D

2 V/m

Option D (2 V/m) is correct because the potential difference per unit length is calculated by dividing the total potential difference by the length of the wire.

2 Easy

2 of 14

Understanding +4 | -1

Ohm's law is valid if

View answer and explanation

Correct option: D

I

depends on

V

linearly

Option D (

I

depends on

V

linearly) is correct because Ohm's law states that voltage is directly proportional to current, implying a linear relationship between them.

3 Easy

3 of 14

Analyzing +4 | -1

Statement-1: When a wire is stretched so that its diameter is halved then its resistance become 16 times.
Statement-2: Resistance of wire decrease with increase in length.

View answer and explanation

Correct option: C

Statement-1 is true, Statement-2 is false

Option C (Statement-1 is true, Statement-2 is false) is correct because when the diameter is halved, the resistance becomes 16 times, and resistance increases with length.

4 Easy

4 of 14

Analyzing +4 | -1

Five hundred cells of same emf

E

and same internal resistance

r

are connected in series to form a loop in same order (without external resistance). The potential drop across 199 cells is found to be

View answer and explanation

Correct option: D

Zero

Option D is correct. When cells are connected in a loop, the potential drop across any number of cells is zero due to the closed-loop configuration.

5 Easy

5 of 14

Analyzing +4 | -1

Statement-1: Potential difference across the terminals of a battery can be greater than its emf.
Statement-2: When current is taken from battery,

V={\varepsilon}- Ir

(Symbols have their usual meaning).

View answer and explanation

Correct option: B

Statement-1 is true, Statement-2 is true, Statement-2 is not the correct explanation for Statement-1

Option B is correct. Statement-1 is true because the terminal voltage can exceed EMF during charging. Statement-2 is true but doesn't explain Statement-1.

6 Easy

6 of 14

Application +4 | -1

A current of

10 \mathrm{~amp}

is passing through a metallic wire of cross sectional area

4 \times 10^{-6} \mathrm{~m}^2

. If the density of the aluminum conductor is

2.7 \,\mathrm{gm/cc}

considering aluminum gives 1 electrons per atom for conduction find the drift speed of the electrons if molecular weight of aluminum is

27 \mathrm{~gm}

View answer and explanation

Correct option: C

2.6 \times 10^{-4} \mathrm{~m} / \mathrm{s}

Option C (

2.6 \times 10^{-4} \mathrm{~m} / \mathrm{s}

) is correct because it is calculated using the drift velocity formula, considering the number density of electrons.

7 Easy

7 of 14

Understanding +4 | -1

Statement-1: Two unequal resistances are connected in series across a cell, then potential drop across the larger resistance is more.
Statement-2: The current will be same in both unequal resistances.

View answer and explanation

Correct option: A

Statement-1 is true, Statement-2 is true, Statement-2 is the correct explanation for Statement-1

Option A (Statement-1 is true, Statement-2 is true, Statement-2 is the correct explanation for Statement-1) is correct because in a series circuit, the current is the same through all resistors, and the potential drop is proportional to the resistance.

8 Easy

8 of 14

Analyzing +4 | -1

Statement-1: If a wire is stretched to increase its length

n

times then its resistance also become

n

time.
Statement-2: Resistance of the wire is directly proportional to its length.

View answer and explanation

Correct option: D

Statement-1 is false, Statement-2 is true

Option D is correct because Statement-1 is false (resistance becomes n² times), and Statement-2 is true (resistance is directly proportional to length).

9 Easy

9 of 14

Application +4 | -1

The emf of a battery A is balanced by a length of 80 cm on a potentiometer wire. The emf of a standard cell 1 V is balanced by 50 cm. The emf of A is

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Correct option: D

1.6 V

Option D (1.6 V) is correct because the emf is directly proportional to the balancing length in a potentiometer.

10 Easy

10 of 14

Understanding +4 | -1

Statement-1: Current flows in a conductor only when there is an electric field within the conductor.
Statement-2: The drift velocity of electrons in the presence of electric field decreases.

View answer and explanation

Correct option: C

Statement-1 is true, Statement-2 is false

Option C (Statement-1 is true, Statement-2 is false) is correct because current flow requires an electric field, and the drift velocity of electrons increases with the electric field.

11 Easy

11 of 14

Remembering +4 | -1

The Kirchhoff's second law

(\Sigma i R=\Sigma E),

where the symbols have their usual meanings, is based on

View answer and explanation

Correct option: D

conservation of energy

Option D (conservation of energy) is correct because Kirchhoff's second law is a statement about the conservation of energy in a closed loop.

12 Easy

12 of 14

Application +4 | -1

When a current

I

is set up in a wire of radius

r

, the drift velocity is

\mathrm{v}_{\mathrm{d}}

. If the same current is set up through a wire of radius

2 \mathrm{r}

, the drift velocity will be

View answer and explanation

Correct option: D

\mathrm{v}_{\mathrm{d}} / 4

Option D (

\mathrm{v}_{\mathrm{d}} / 4

) is correct because drift velocity is inversely proportional to the cross-sectional area of the wire, which depends on the square of the radius.

13 Easy

13 of 14

Understanding +4 | -1

Statement-1: Two unequal resistances are connected in parallel across a cell, then current through the smaller resistor is more.
Statement-2: More current will flow through a larger resistor.

View answer and explanation

Correct option: C

Statement-1 is true, Statement-2 is false

Option C (Statement-1 is true, Statement-2 is false) is correct because in a parallel connection, current flows inversely proportional to resistance.

14 Easy

14 of 14

Understanding +4 | -1

Statement-1: A piece of copper and other of germanium are cooled from room temperature to

100 \,\mathrm{K}

conductivity of copper increases and that of germanium decreases.
Statement-2: Copper has positive temperature coefficient where as germanium has negative temperature coefficient.

View answer and explanation

Correct option: A

Statement-1 is true, Statement-2 is true, Statement-2 is the correct explanation for Statement-1

Option A (Statement-1 is true, Statement-2 is true, Statement-2 is the correct explanation for Statement-1) is correct because copper's conductivity increases with decreasing temperature, while germanium's decreases, due to their temperature coefficients.

Revision notes and key takeaways

Review CURRENT ELECTRICITY in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 14 single-correct-answer MCQs on CURRENT ELECTRICITY.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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