PYQ Vault

Day 39: CBSE Class 10 Science

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

  1. Question 1

    Control and Coordination. This type asked 4 times: 2023, 2024, 2025, 2026. This one: 2026

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    8
    Assertion (A) : Reflex actions do not involve thinking. Reason (R) : Most reflex actions are controlled by the spinal cord.

    Tap an option to check your answer.

  2. Question 2

    Electricity. This type asked 4 times: 2022, 2023, 2024, 2026. This one: 2026

    34
    (a) State the law which gives the relation between the electric current flowing through a given conductor and the potential difference applied across it. (b) Draw V-I graph for a given conductor as per the law stated in above question (a).

  3. Question 3

    Electricity. This type asked 4 times: 2023, 2024, 2025, 2026. This one: 2026

    39 (B)
    (i) Define electrical resistivity of a material. (ii) How will the resistivity and resistance of a conducting wire change if the length and area of cross-section of wire both are doubled ? Justify your answer. (iii) Calculate the electric current flowing through a 4 Ω4\,\Omega resistor that produces 100 J of heat every second.

  4. Question 4

    Electricity. This type asked 4 times: 2023, 2024, 2025, 2026. This one: 2026

    39 (b)
    (i) How many bulbs of resistance 8 Ω8\,\Omega each should be connected in parallel combination to draw a current of 2 A from a battery of 4 V ? (ii) Name the device used for measuring electric current. How is it connected in a circuit ? (iii) State Joule’s law of heating.

  5. Question 5

    Electricity. This type asked 4 times: 2022, 2024, 2025, 2026. This one: 2026

    39 (a)
    (i) Consider the following electric circuit : Calculate the values of the following : (I) Total resistance of the circuit. (II) The total electric current drawn from the source. (III) Potential difference across 3 Ω3\,\Omega resistor. (ii) Two bulbs, rated as 100 W ; 220 V and 60 W ; 220 V are connected in parallel to an electric main supply of 220 V. Calculate the electric current drawn from the mains.