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Answer the following. (Science 2025 31/5/1 Q33)

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ScienceCBSE Class 10 · Board exam 2025, set 31/5/1 · 3 marks · Short answer

CBSE Class 10 Science 2025: question 33

Set in the CBSE Class 10 board exam of 2025, paper 31/5/1, section C, question 33, for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q33 · 3 marks · Short answerElectricity

Answer the following.

  1. (a)

    "The third wire of earth connection is very important in domestic electric appliances." Justify this statement.

    0 marks
  2. (b)

    List two precautions to be taken to avoid the overloading of domestic electric circuits.

    0 marks

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/5/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

What happens if the live wire touches the metal casing of an appliance and you touch it?

Hint 2

Overloading means too much current; think of the device that cuts it off and the habit that causes it.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. (a) The earth wire is connected to the metallic body of appliances such as an iron, toaster or refrigerator. If current leaks to the metal body, the earth wire gives it a low-resistance path to the earth and keeps the body at the earth's potential (zero). So the user does not get a severe electric shock; the earth wire is a safety measure.

    2 marks

  2. (b) Precaution 1: use an electric fuse (or MCB) of proper rating in the circuit.

    ½ mark

  3. (b) Precaution 2: do not connect too many appliances to a single socket at the same time.

    ½ mark

Answer: (a) The earth wire keeps the metal body at earth potential and carries leaked current to earth, preventing severe shock; (b) use a fuse of proper rating; avoid connecting many appliances to one socket.

Where the marks are

  • Explains that the earth wire carries leakage current to earth and keeps the appliance body at earth potential, preventing shock (2 marks)
  • Any two precautions against overloading (½ + ½ mark)

Revise the chapter

  • Chapter: Electricity (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Electricity, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 31/5/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.