CBSE Class 10 Science Chapter 11 Electricity Worksheet with Answers

Electricity explores the behaviour of electric charge in motion. Electric current (I) is the rate of flow of charge, measured in amperes. Potential difference (V) is the work done to move a unit charge between two points, measured in volts. Ohm's law states V = IR, where R is resistance in ohms. Resistance depends on material resistivity (ρ), length (l), and cross-sectional area (A) via R = ρl/A. Resistors in series add directly (R_total = R1 + R2 +...), while in parallel they follow 1/R_total = 1/R1 + 1/R2 +.... The heating effect of current is given by H = I²Rt (Joule's law). Electric power P = VI = I²R = V²/R, measured in watts. These principles underpin every numerical and conceptual question in this chapter.

This section tests your conceptual grasp of definitions, laws, and unit conversions. Read each question carefully and select the single best answer. Remember that Ohm's law applies only to ohmic conductors at constant temperature, and resistivity is temperature-dependent. Pay attention to units: 1 kWh = 3.6 × 10⁶ J, and 1 mA = 10⁻³ A. These MCQs are drawn from recurring CBSE board exam patterns and NCERT examples. Attempt all six questions without referring to your textbook. Each correct answer earns you 1 mark. After completion, cross-check with the answer key and note any misconceptions. Practice similar MCQs daily to build speed and accuracy for the objective section in your board exam.

Fill-in-the-blank questions demand precise recall of terminology and formulae. Write your answers in the space provided, using correct NCERT terminology. For instance, 'resistivity' is not the same as 'resistance', and 'potential difference' should not be confused with 'electromotive force'. Pay attention to units and standard symbols: ρ for resistivity, σ for conductivity, and R for resistance. These five statements cover fundamental definitions, laws, and relationships from Chapter 11. Avoid vague language; the answer key expects exact terms as given in NCERT Class 10 Science textbook. This section sharpens your ability to articulate concepts clearly, a skill crucial for short-answer board questions.

Part I: Match the Following. Draw lines or write letter pairs (e.g. A-3) to link Column A concepts with their correct descriptions in Column B. Each correct match earns 0.5 marks, total 2.5 marks. Part II: True or False. Read each statement and write T or F. If false, you may optionally write a one-line correction for self-learning. This dual-format section checks whether you can distinguish between similar terms (e.g. series vs parallel properties) and identify common misconceptions (e.g. 'current is used up in a resistor'). CBSE often includes such questions in the objective section. Accuracy here signals solid foundational understanding, which is essential before tackling numerical problems.

Short-answer questions require you to explain a concept in 30-50 words or solve a numerical problem in three to four steps. Show all working clearly: write the formula, substitute values with units, and box the final answer. For theory questions, use NCERT language and include one concrete example. The CBSE marking scheme awards 1 mark for the correct formula, 1 mark for substitution, and 1 mark for the final answer with unit in numerical problems. These five questions cover Ohm's law applications, resistance calculations, series-parallel combinations, and power-energy conversions—all high-frequency topics in board exams. Allocate roughly 3 minutes per 2-mark question and 4 minutes per 3-mark question. Practice writing concise, point-form answers to save time under exam pressure.

Long-answer questions test your ability to synthesize multiple concepts, derive expressions, and apply higher-order thinking skills. Each question is worth 5 marks and should be answered in 80-120 words or through a detailed numerical solution. Structure your answer in clear steps: state the principle, draw a labelled diagram if required, write the derivation or calculation, and conclude with the result and its significance. HOTS questions often ask you to compare two scenarios (series vs parallel), explain real-life applications, or justify why a particular design is used. For numerical HOTS, you may need to combine Ohm's law, power formulae, and energy calculations in a single problem. These three questions mirror the 5-mark questions that appear in Section C of the CBSE board paper. Allocate 7-8 minutes per question and focus on step-wise logic.

Case-study questions are a hallmark of the CBSE 2025 board exam pattern. A short paragraph describes a real-world scenario—such as a household electrical circuit, an electric vehicle charging station, or a laboratory experiment—followed by three or four sub-questions worth 1 mark each. Read the passage carefully, underline key data (voltages, resistances, power ratings), and apply Chapter 11 concepts to answer each sub-question. These questions test your ability to extract information, perform quick calculations, and interpret results in context. They often combine Ohm's law, series-parallel analysis, and power-energy conversions. Practising case-study questions builds exam confidence because you learn to handle unfamiliar contexts using familiar physics principles. Allocate 6-7 minutes for this section and ensure you answer all sub-parts clearly, even if one seems tricky.

Section A Answers: (1) a — coulomb is the SI unit of charge; (2) b — Q = It = 0.6 × 120 = 72 C; (3) c — nichrome wire is an ohmic conductor; (4) c — series: R = 4 + 6 = 10 Ω; (5) c — kWh is the commercial energy unit; (6) c — resistivity of metals increases with temperature. Section B Answers: (7) length, area of cross-section; (8) directly proportional; (9) potential difference (or voltage); (10) heater, iron (or bulb, toaster); (11) 3.6 × 10⁶. Section C Answers: Match: A-3, B-5, C-4, D-1, E-2. True/False: (12) F—current is same in series; (13) T; (14) F—fuse wire must have low melting point and high resistivity; (15) T. Section D Answers: (16) Ohm's law: V = IR. I = 12/6 = 2 A. (17) Resistivity is the resistance of a unit cube of material; SI unit: Ω·m (or ohm-metre). Alloys have higher resistivity and do not oxidize easily at high temperature. (18) 1/R = 1/3 + 1/6 = 1/2, so R = 2 Ω. (19) (i) R = V²/P = 220²/100 = 484 Ω; (ii) I = P/V = 100/220 ≈ 0.45 A. (20) H = VIt = (IR)It = I²Rt (using V = IR). Application: electric fuse or electric heater.

Print this worksheet and attempt it in one sitting under exam conditions: no textbook, no phone, strict 90-minute timer. Use a pencil so you can erase and retry if needed. Start with Section A to build confidence, then tackle Sections B and C quickly—these are knowledge-based and should take 15-20 minutes combined. Spend the bulk of your time on Sections D, E, and F: show every step, write units, and box final answers. After 90 minutes, stop and mark your work against the answer key. Award yourself honest marks using the CBSE marking scheme: 1 mark per MCQ, fill-in-the-blank, and match; 2-3 marks per short answer; 5 marks per long answer; 4 marks for the case study. Identify patterns in your mistakes—formula errors, unit mistakes, or conceptual gaps—and revise those topics from your NCERT Class 10 Science textbook. For personalised doubt-solving, photograph any tricky question and upload it to CBSETUTOR.ai, where a 24×7 AI tutor explains step-by-step solutions tailored to CBSE board exam standards. CBSETUTOR.ai offers a flat ₹999/month subscription for Classes 6-12, with a 3-day free trial, so every student can access expert help anytime, anywhere. Repeat similar worksheets weekly to master Electricity and boost your board exam score above ninety percent.