PYQ Vault

Day 17: 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*, 2026 (* = numbers or wording changed that year)

    17
    The volume ratio of hydrogen and oxygen gases liberated during electrolysis of water is :

    Tap an option to check your answer.

  2. Question 2

    Chemical Reactions and Equations. Asked 2 times: 2023*, 2026 (* = numbers or wording changed that year)

    26
    (a) Name the substance oxidised and reduced in the following reaction : ZnO+C⟶Zn+CO\mathrm{ZnO + C \longrightarrow Zn + CO} (b) Balance the following chemical reaction : Pb(NO3)2+KI⟶PbI2+KNO3\mathrm{Pb(NO_3)_2 + KI \longrightarrow PbI_2 + KNO_3} (c) Give one example each of electrolytic decomposition and decomposition by sunlight.

  3. Question 3

    Chemical Reactions and Equations. Asked 2 times: 2023*, 2026 (* = 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.
    24
    Assertion (A) : Reaction of quick lime with water is an exothermic reaction. Reason (R) : A large amount of heat is evolved on the reaction of quick lime and water.

    Tap an option to check your answer.

  4. Question 4

    Control and Coordination. Asked 2 times: 2023*, 2026 (* = numbers or wording changed that year)

    6
    In plants, the role of cytokinin is to/in :

    Tap an option to check your answer.

  5. Question 5

    Control and Coordination. Asked 2 times: 2025*, 2026 (* = numbers or wording changed that year)

    2
    Identify the type of tropic movement that is responsible for the movement of the pollen tube towards an ovule from the following options.

    Tap an option to check your answer.