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Answer the following. (Science 2025 31/6/1 Q33)

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ScienceCBSE Class 10 · Board exam 2025, set 31/6/1 · 3 marks · Short answer

CBSE Class 10 Science 2025: question 33

Set in the CBSE Class 10 board exam of 2025, paper 31/6/1, 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)

    Explain the statement "Potential difference between two points is 1 volt".

    0 marks
  2. (b)

    What do the symbols given below represent in an electric circuit ? Write one function of each.

    0 marks

Figure in the paper: Two circuit symbols: (i) a circle with letter A (ammeter) with terminals marked + and −; (ii) a resistor (zig-zag) with an arrow passing diagonally through it, indicating a variable resistor (rheostat). See it in the official paper.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/6/1.

Hints

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

Hint 1

Potential difference is defined as work done per unit charge, V = W/Q.

Hint 2

A circle with A is a measuring instrument. An arrow across a resistor means the resistance can be varied.

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 potential difference between two points is 1 volt if 1 joule of work is done to move a charge of 1 coulomb from one point to the other: .

    1 mark

  2. (b)(i) The symbol is an ammeter.

    ½ mark

  3. Function: it measures the electric current in a circuit. It is connected in series.

    ½ mark

  4. (b)(ii) The symbol is a rheostat (variable resistance).

    ½ mark

  5. Function: it changes the resistance of the circuit, and so regulates the current.

    ½ mark

Answer: (a) 1 J of work is done to move 1 C of charge between the points; (b)(i) Ammeter, measures current; (ii) Rheostat, varies resistance/current.

Where the marks are

  • Explains 1 V as 1 J of work per 1 C of charge (1 mark)
  • Ammeter (½ mark) and its function (½ mark)
  • Rheostat (½ mark) and its function (½ mark)

Revise the chapter

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 31/6/1: 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.