Electricity — Class 10 MCQs with Answers
Class 10 CBSE Science (Physics) · Chapter 11
115 practice questions · 33 Easy · 42 Medium · 40 Hard · Updated
Jump to the 6 solved questions
Practise the most important Class 10 CBSE Science (Physics) questions from Chapter 11, "Electricity". You get 11 timed quizzes made from 115 NCERT-based MCQs, with answers and explanations. The questions are split into 33 Easy, 42 Medium and 40 Hard. Warm up on the basics, then move on to the exam-level questions that top scorers in CBSE Board exams and the JEE & NEET foundation years get right.
To score well in "Electricity", focus on clear concepts in physics, chemistry and biology basics. Each MCQ here is timed and uses exam-style marking (+4 correct, −1 wrong, 0 skipped). This helps you stay accurate when time is short, just as real papers need. Every question has a short explanation, so a wrong answer becomes a quick lesson. It is the fastest way to fix gaps before a test.
Use this chapter for focused revision. Start with the Easy set to check your basics on Electricity, then move to Medium and Hard to practise applying them. Your accuracy, streaks and XP save automatically. This chapter also adds to your overall Class 10 Science (Physics) mastery score. Try the 6 sample questions below: tap an option to see the answer and a worked explanation. Sign in free to start practising.
Electricity — important questions & MCQs with answers (Class 10 Science (Physics))
6 solved questions from this chapter's difficulty levels, each with its answer and explanation. Tap an option to check yourself.
0 of 6 answered
- Q1 of 6Easy
The SI unit of electric current is:
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Answer: Ampere
Explanation: Current is the rate of flow of charge, I = Q/t, so its SI unit is the ampere (1 A = 1 C/s); coulomb measures the charge itself, not its rate of flow, so it isn't the current unit.
- Q2 of 6Easy
Electric power dissipated in a resistor is:
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Answer: P = V·I
Explanation: Power dissipated equals P = V × I, which can also be written as I²R or V²/R using Ohm's law; V/I instead gives resistance, and I²/R isn't a valid power expression.
- Q3 of 6Medium
R = ρL/A. If L doubles and A is halved, new resistance is:
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Answer: 4 R
Explanation: Since R = ρL/A, doubling length to 2L and halving area to A/2 multiplies R by 4, giving 4R; considering only the length change would wrongly suggest just 2R.
- Q4 of 6Medium
Assertion (A): The coils of electric toasters and electric irons are made of an alloy rather than a pure metal. Reason (R): Alloys do not oxidise (burn) readily at high temperatures.
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Answer: Both A and R are true and R is the correct explanation of A
Explanation: Both are true. The chapter says alloys are used in heating devices for this reason: they do not burn readily at high temperatures.
- Q5 of 6Hard
A wire of resistance R is stretched to twice its length without changing its volume. New resistance:
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Answer: 4 R
Explanation: Volume stays constant, so doubling length to 2L halves the area to A/2; since R = ρL/A, the new resistance is ρ(2L)/(A/2) = 4 × ρL/A = 4R.
- Q6 of 6Hard
Assertion (A): When resistors of 5 Ω, 10 Ω and 30 Ω are connected in parallel, their equivalent resistance is 45 Ω. Reason (R): The reciprocal of the equivalent resistance of resistors in parallel equals the sum of the reciprocals of the individual resistances.
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Answer: A is false but R is true
Explanation: A is false: 1/Rp = 1/5 + 1/10 + 1/30 = 1/3, so Rp = 3 Ω; 45 Ω would be the series value. R is true.
Electricity notes: key concepts (Class 10 Science (Physics))
Electric current is the flow of charge, and Ohm's law relates it to the potential difference driving it and the resistance opposing it. This chapter covers resistance and resistivity, series and parallel combinations, and the heating effect that underlies fuses, bulbs and the electricity bill.
- Electric current
- The rate of flow of electric charge through a conductor, measured in amperes; conventional current flows opposite to electron flow.
- Potential difference
- The work done to move a unit charge between two points, measured in volts; it is what drives current through a circuit.
- Ohm's law
- At constant temperature the current through a conductor is directly proportional to the potential difference across it.
- Resistance
- The opposition a conductor offers to current, measured in ohms; a graph of V against I is a straight line whose slope is the resistance.
- Factors affecting resistance
- Resistance increases with length, decreases with area of cross-section, and depends on the material and its temperature.
- Resistivity
- A property of the material alone, independent of the conductor's dimensions, which is why it is used to compare materials.
- Resistors in series
- The same current passes through each, and the total resistance is the sum, so the combined resistance exceeds the largest one.
- Resistors in parallel
- The same potential difference is across each, and the reciprocal of the total is the sum of the reciprocals, so the total is less than the smallest.
- Why household circuits are parallel
- Each appliance receives the full supply voltage and can be switched independently, and a failure in one does not break the others.
- Heating effect of current
- A current passing through a resistor produces heat proportional to I²Rt, which is the basis of heaters, irons and filament bulbs.
- Electric fuse
- A short wire of low melting point placed in series that melts and breaks the circuit if the current exceeds a safe value.
- Electric power
- The rate at which electrical energy is consumed, measured in watts and calculated from any pair of V, I and R.
- Commercial unit of energy
- Electrical energy is billed in kilowatt-hours; one unit equals 3.6 × 10⁶ joules.
- Filament and appliance materials
- Tungsten is used for filaments for its very high melting point, and alloys such as nichrome for heating elements for their high resistivity.
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Electricity — FAQs
What are the key concepts in Class 10 Science (Physics) Electricity?+
Electric current is the flow of charge, and Ohm's law relates it to the potential difference driving it and the resistance opposing it. This chapter covers resistance and resistivity, series and parallel combinations, and the heating effect that underlies fuses, bulbs and the electricity bill. Key ideas include Electric current, Potential difference, Ohm's law, Resistance, Factors affecting resistance, Resistivity.
What does Class 10 Science (Physics) Chapter 11 (Electricity) cover on XamBaaz?+
It has 115 NCERT-based MCQs on "Electricity": 33 Easy, 42 Medium and 40 Hard. Together they make 11 timed quizzes, and you never get the same set twice. Every question has an instant explanation. They help you prepare for CBSE Board exams and the JEE & NEET foundation years.
Are these "Electricity" questions free to practise?+
Yes. Sign in with Google to practise "Electricity" free. Full unlimited access is ₹999/year. One year from the day you pay. You stay in Class 10 till 31 March; on 1 April your account moves up to Class 11 and the rest of your year carries over. No chapter is charged separately.
How should I revise "Electricity" for the exam?+
Start with the Easy quiz to check your basics, then try Medium and Hard to practise applying them. There are 11 timed quizzes on this chapter, so you can come back for a fresh set instead of one you have seen. Read each explanation, retry the questions you miss, and track your accuracy until it stays high.
Are these "Electricity" MCQs available with answers?+
Yes. 6 sample questions are on this page with answers: tap an option, or "Show answer", to see the correct option and a step-by-step explanation. Sign in free with Google to start practising, with instant scoring.
Is there negative marking in the "Electricity" quizzes?+
Yes. The timed quizzes use exam-style marking: +4 for a right answer, −1 for a wrong one and 0 for a skip. MHT-CET and CBSE board papers have no negative marking. Our mocks for those are scored their way.
What are the important questions from Electricity (Class 10 Science (Physics))?+
The questions that matter most test Electric current, Potential difference, Ohm's law, Resistance, Factors affecting resistance, Resistivity. This page shows 6 solved important MCQs with answers and explanations. Sign in to practise all 115 questions on the chapter as timed quizzes.
Is there an online quiz for Electricity?+
Yes — Class 10 Science (Physics) Electricity has timed online quizzes at Easy, Medium and Hard levels, with instant scoring and a worked explanation on every question. The first quiz on the chapter is free.
Are there question answers and extra questions for Electricity (Class 10 Science (Physics))?+
Yes. This page has 6 solved questions on Electricity, each with the correct answer and a short explanation. Sign in to practise all 115 questions on the chapter as timed quizzes.
Are there assertion–reason and case study questions for Electricity (Class 10 Science (Physics))?+
Yes. The Electricity question bank has 9 assertion–reason questions and 12 case-based (case study) questions in the CBSE board format, alongside the regular MCQs. Each comes with the answer and a worked explanation. Sign in to practise them in timed quizzes.