PYQ Vault

Day 237: CBSE Class 10 Science

5 questions. Try each one first, then open its answer.

  1. Question 1

    Electricity. Asked once: 2024

    26
    Calculate the resistance of a copper wire of length 1000 m and area of cross-section 2 mm2\mathrm{mm^2}. Resistivity of copper is 1⋅6×10−8 Ω1{\cdot}6 \times 10^{-8}\,\Omega m.

  2. Question 2

    Acids, Bases and Salts. Asked once: 2023

    24
    A knife which is used to cut a fruit was immediately dipped into water containing drops of blue litmus solution. If the colour of the solution is changed to red, what inference can be drawn about the nature of the fruit and why ?

  3. Question 3

    Electricity. Asked once: 2024

    26
    The filament of an electric lamp draws a current of 0⋅50{\cdot}5 A, which lights for 2 hours. Calculate the charge that flows through the circuit.

  4. Question 4

    Acids, Bases and Salts. Asked once: 2023

    21 (b)
    Write balanced chemical equation for the reaction that occurs when : (i) blue coloured copper sulphate crystals are heated and (ii) Sodium hydrogen carbonate is heated during cooking.

  5. Question 5

    Electricity. Asked once: 2023

    15
    In the following diagram, the position of the needle is shown on the scale of a voltmeter. The least count of the voltmeter and the reading shown by it respectively are :

    Tap an option to check your answer.