Cbse class 10th science Electricity-test

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Here’s a comprehensive test paper for CBSE Class 10 Science Chapter 11: Electricity, designed as per the latest CBSE 2024-25 syllabus and incorporating NCERT, previous year papers, sample papers, and competency-based questions.

Class 10 Science – Chapter 11: Electricity

Comprehensive Test Paper

Maximum Marks: 40 | Time Allowed: 1.5 Hours

Section A: High Order Thinking Questions (In-Depth Assessment) [3 × 4 = 12 Marks]

  1. (Numerical) A 100 W electric bulb is connected to a 220 V supply. Calculate:
    a) The current flowing through the bulb.
    b) The resistance of the filament of the bulb.
    c) The energy consumed by the bulb in 10 hours.
  2. (Conceptual) Derive the relation between power, voltage, current, and resistance. How does the power dissipated in a resistor vary with an increase in resistance if the voltage remains constant?
  3. (Application-Based) Two resistors of 3Ω and 6Ω are connected in series across a 12V battery. Calculate:
    a) Total resistance in the circuit.
    b) Current flowing through the circuit.
    c) Potential difference across each resistor.

Section B: Competency-Based Questions [3 × 3 = 9 Marks]

  1. A street light works on a series-parallel circuit. Why do the lights in the streets not turn off even if one light stops working? Explain using a circuit diagram.
  2. A student set up a circuit consisting of a battery, an ammeter, a voltmeter, and a resistance wire. He observed that when the length of the resistance wire was doubled, the reading of the ammeter reduced to half. Explain why.
  3. Two students set up a simple electric circuit in their lab using a 6V battery, a 3Ω resistor, and a switch. After closing the switch, they noticed that the battery heated up. Suggest two possible reasons for this observation and propose methods to reduce the heating effect.

Section C: Previous Year Questions [3 × 3 = 9 Marks]

  1. (PYQ 2022) Why is a fuse connected in series with an electrical appliance? Explain how a fuse works with the help of a circuit diagram.
  2. (PYQ 2021) Draw a circuit diagram to show the combination of three resistors 2Ω, 3Ω, and 5Ω connected in parallel across a 12V supply. Calculate:
    a) The total resistance of the circuit.
    b) The total current flowing through the circuit.
  3. (PYQ 2020) Explain Ohm’s law. How does the resistance of a conductor depend on its length and cross-sectional area?

Section D: NCERT-Based Questions [2 × 4 = 8 Marks]

  1. (NCERT – Comprehensive) Why are household electrical appliances connected in parallel instead of series? Justify your answer with proper reasoning and circuit diagrams.
  2. (NCERT – Comprehensive) A 10Ω resistor is connected in series with a battery of 12V. If another 10Ω resistor is added in parallel to the circuit, how will the current through the circuit change? Explain mathematically.

Section E: Sample Paper-Based Questions [3 × 3 = 9 Marks]

  1. (CBSE Sample Paper 2023) Define resistivity. Two wires of the same material and same length but different cross-sectional areas are given. Which wire will have more resistance and why?
  2. (CBSE Sample Paper 2022) A heater of resistance 20Ω is connected across a 200V power supply. Find the power consumed by the heater.
  3. (CBSE Sample Paper 2021) A 12V battery is connected across a resistor. The current in the circuit is measured to be 3A. Calculate:
    a) The resistance of the resistor.
    b) The power dissipated in the resistor.

Section F: Case-Based Questions [2 × 5 = 10 Marks]

  1. (Case-Based) Electric Shock and Safety Measures
    Rajesh was using a washing machine and noticed that the metallic body of the machine gave him a slight shock. He immediately switched off the power supply and called an electrician.

Based on this situation, answer the following questions:
a) Why did Rajesh experience an electric shock?
b) What is earthing? How does it prevent electric shocks?
c) The machine operates at 220V and draws 10A current. Calculate its power consumption.
d) What type of fuse should be used in the circuit? Why?
e) Suggest two electrical safety measures to be followed at home.

  1. (Case-Based) Electrical Circuits and Power Consumption
    A household circuit consists of three appliances: a 100W bulb, a 500W refrigerator, and a 1500W heater, all connected to a 220V supply.

Answer the following:
a) Draw the circuit diagram representing the connections.
b) Calculate the total current drawn from the supply when all devices are used simultaneously.
c) Why are household appliances always connected in parallel?
d) If a 5A fuse is used in this circuit, what will happen when all appliances are turned on?
e) Suggest an alternative rating for the fuse and explain your reasoning.

 

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