PYQ Vault

Day 38: CBSE Class 10 Science

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

  1. Question 1

    Chemical Reactions and Equations. This type asked 4 times: 2023, 2024, 2025, 2026. This one: 2026

    19
    In the following equation x KI+H2O2⟶I2+y KOH\mathrm{x\,KI + H_2O_2 \longrightarrow I_2 + y\,KOH} x and y respectively are :

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  2. Question 2

    Chemical Reactions and Equations. This type asked 4 times: 2023, 2024, 2025, 2026. This one: 2026

    26
    Answer the following : (a) Identify the substance oxidized and the substance reduced in the following reaction : 4Na+O2⟶2Na2O\mathrm{4Na + O_2 \longrightarrow 2Na_2O} (b) What type of reaction occurs when Lead (II) nitrate solution is mixed with potassium iodide solution ? (c) Why is silver chloride stored in dark coloured bottles ?

  3. Question 3

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

    4
    From the given situations, identify ‘Chemotropic’ and ‘Geotropic’ movements in parts of plants, respectively : (i) Growth of pollen tube towards ovule. (ii) Movement of sunflower towards sunlight. (iii) Movement of root towards Earth/Gravity. (iv) Movement of leaves due to breeze. Choose the correct option :

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  4. Question 4

    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.
    9
    Assertion (A) : In case of iodine deficiency in our diet, there is a possibility that we might suffer from goitre. Reason (R) : One of the symptoms of goitre is swelling of neck.

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  5. Question 5

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

    5
    Following are the statements about the different parts of the brain. Select the correct statements. (i) The thinking part of the brain is the forebrain. (ii) Centres for smell, hearing, memory, sight are located in forebrain. (iii) Salivation, vomiting, blood pressure are controlled by medulla in the hind brain. (iv) Cerebellum does not control the posture and balance of the body.

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