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An electric source can supply… (Class 10 Science 2024, Q26)

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ScienceCBSE Class 10 · Board exam 2024, set 31/5/1 · 2 marks · Very short answer

CBSE Class 10 Science 2024: question 26

Set in the CBSE Class 10 board exam of 2024, paper 31/5/1, section B, question 26, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q26 · 2 marks · Very short answerElectricity

An electric source can supply a charge of 500 coulomb. If the current drawn by a device is 25 mA, find the time in which the electric source will be discharged completely.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/5/1.

Hints

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

Hint 1

Current is the charge that flows per unit time. Write the relation linking Q, I and t.

Hint 2

Change milliamperes into amperes before dividing, since 1 mA = A.

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. Given and . Use , so .

    ½ mark

  2. Convert the current to amperes:

    ½ mark

  3. The source is completely discharged in s (about 5.56 h).

    1 mark

Answer: t = 20000 s

Where the marks are

  • Uses , i.e. (½ mark)
  • Converts 25 mA to 0.025 A (½ mark)
  • Obtains t = 20000 s with unit (1 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 paper2024 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.