PYQ Vault

Day 33: CBSE Class 10 Science

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

  1. Question 1

    Chemical Reactions and Equations. Asked 2 times: 2023*, 2024 (* = numbers or wording changed that year)

    3
    Which of the following reactions is an endothermic reaction ?

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  2. Question 2

    Control and Coordination. Asked 2 times: 2023*, 2024 (* = numbers or wording changed that year)

    8
    Sense organ in which olfactory receptors are present is :

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  3. Question 3

    Electricity. Asked 2 times: 2023*, 2024 (* = numbers or wording changed that year)

    36 (a)
    (i) The potential difference across the two ends of a circuit component is decreased to one-third of its initial value, while its resistance remains constant. What change will be observed in the current flowing through it ? Name and state the law which helps us to answer this question. (ii) Draw a schematic diagram of a circuit consisting of a battery of four 1⋅51{\cdot}5 V cells, a 5 Ω5\,\Omega resistor, a 10 Ω10\,\Omega resistor and a 15 Ω15\,\Omega resistor and a plug key, all connected in series. Now find (I) the electric current passing through the circuit, and (II) potential difference across the 10 Ω10\,\Omega resistor when the plug key is closed.

  4. Question 4

    Heredity. Asked 2 times: 2023*, 2024 (* = numbers or wording changed that year)

    8
    Which one of the following statements is NOT true ?

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  5. Question 5

    Life Processes. Asked 2 times: 2023*, 2024 (* = numbers or wording changed that year)

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    18
    Assertion (A) : In the human heart ventricles have thicker muscular walls than atria. Reason (R) : Ventricles have to pump the blood into various organs.

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