PYQ Vault

Day 181: CBSE Class 10 Science

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

  1. Question 1

    Chemical Reactions and Equations. Asked once: 2024 (same type asked 3 times)

    1
    Zn+2CH3COOH⟶(CH3COO)2 Zn+H2\mathrm{Zn + 2CH_3COOH \longrightarrow (CH_3COO)_2\,Zn + H_2} The above reaction is a :

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  2. Question 2

    Chemical Reactions and Equations. Asked once: 2024 (same type asked 3 times)

    23
    Translate the following statement into a balanced chemical equation. “When barium chloride reacts with aluminium sulphate, aluminium chloride and barium sulphate are formed.” State the type of this reaction giving reason to justify your answer.

  3. Question 3

    Control and Coordination. Asked once: 2024 (same type asked 3 times)

    7
    A plant growth inhibitor hormone which causes wilting of leaves is called :

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  4. Question 4

    Heredity. Asked once: 2024 (same type asked 3 times)

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    19
    Assertion (A) : In human beings, males have ‘XX’ sex chromosomes and females have ‘XY’ sex chromosomes. Reason (R) : Sex of the child is determined at the time of fertilisation when male and female gamete fuse to form a zygote.

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  5. Question 5

    How do Organisms Reproduce?. Asked once: 2024 (same type asked 3 times)

    11
    Identify the mode of asexual reproduction in the following organism :

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