Back to CURRENT ELECTRICITY

Your Progress

0 / 457 Answered

Correct

Incorrect

Accuracy

JEE • PHYSICS • CURRENT ELECTRICITY

Current electricity practice · Medium

Try a question, then open “View answer” to check it. Sign in to submit answers and save progress.

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.

Take a chapter quiz →

Showing 451-457 of 457 questions

451 Medium

451 of 457

Analyzing +4 | -1

25\,\,W,\,\,220\,\,V

bulb and a

100\,\,W,\,\,220\,\,V

bulb are connected in parallel across a

440\,\,V

line

View answer and explanation

Correct option: C

Both bulbs will fuse

The correct answer is C because the voltage is significantly higher than the rated voltage for both bulbs, causing them to fuse.

452 Medium

452 of 457

Application +4 | -1

An electric lamp is marked

60\,\,W,\,\,230\,\,V

. The cost of a

1\,\,kWh

of energy is

Rs.\,\,1.25

. The cost of using this lamp

8\,\,hrs

a day for

\mathrm{30 }\,\mathrm{days}

View answer and explanation

Correct option: C

Rs.\,\,18

Option C (Rs. 18) is correct because it is calculated by finding the total energy consumed in kWh and multiplying it by the cost per kWh.

453 Medium

453 of 457

Understanding +4 | -1

The specific resistance of a conducting wire depends upon

View answer and explanation

Correct option: C

Material of the wire only but neither on the length of the wire not on the area of crosssection of the wire

The correct answer is C (Material of the wire only but neither on the length of the wire not on the area of crosssection of the wire) because specific resistance (resistivity) is a material property.

454 Medium

454 of 457

Understanding +4 | -1

A current I flows through a potential difference

V

in an electrical circuit containing a resistance

R

. The product of

V

and

I

, i.e., VI may be understood as

View answer and explanation

Correct option: C

Thermal power radiated by the circuit

Option C (Thermal power radiated by the circuit) is correct because the product of voltage and current (VI) represents the electrical power, which is dissipated as thermal power in a resistive circuit.

455 Medium

455 of 457

Analyzing +4 | -1

Assertion: EMF of battery decreases with time.
Reason: Internal resistance increases with time.

View answer and explanation

Correct option: B

If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion

Option B is correct because both Assertion and Reason are true, but the Reason is not a correct explanation of the Assertion. The EMF decreases due to chemical changes, and the internal resistance increases due to electrolyte depletion.

456 Medium

456 of 457

Application +4 | -1

A resistor develops

400 \mathrm{~J}

of heat in

10 \mathrm{~s}

when a current of

2 \mathrm{~A}

is passed through it. The resistance and the energy developed in

10 \mathrm{~s}

. If the current is doubled is

View answer and explanation

Correct option: C

10 \Omega, 1600 \mathrm{~J}

Option C (

10 \Omega, 1600 \mathrm{~J}

) is correct because the resistance is calculated using

H = i^2Rt

, and the new energy is calculated with the doubled current.

457 Medium

457 of 457

Remembering +4 | -1

Ohm's law defines

View answer and explanation

Correct option: A

A resistance

Option A (A resistance) is correct because Ohm's law (

V=IR

) defines the relationship between voltage, current, and resistance, thus defining resistance.

Revision notes and key takeaways

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

Showing 451-457 of 457 questions

Continue Your Practice

📚 Switch Set (MEDIUM)

Chapter Sets

ALL 475 MCQs EASY 14 MCQs HARD 4 MCQs MEDIUM 457 MCQs

0 /457

0✓ 0✗

0% Accuracy