PYQ Vault

Day 64: CBSE Class 10 Science

5 questions (8 parts). Try each one first, then open its answer.

  1. Question 1

    Carbon and its Compounds. This type asked 2 times: 2024, 2026. This one: 2026

    20
    Which of the following functional group is for carboxylic acid ?

    Tap an option to check your answer.

  2. Question 2

    Carbon and its Compounds. This type asked 2 times: 2025, 2026. This one: 2026

    29 (b)
    (i) Name the following compounds : (I) CH3−CO−CH3\mathrm{CH_3-CO-CH_3} (II) CH3−C≡C−H\mathrm{CH_3-C\equiv C-H} (ii) Name the reaction which is commonly used in the conversion of vegetable oils to fats. (iii) Why is the melting point of C4H10\mathrm{C_4H_{10}} higher than C3H8\mathrm{C_3H_8} ? (iv) What happens when a piece of sodium is dropped into ethanol ? (v) Write the products in the following reaction : CH3COOC2H5+NaOH⟶\mathrm{CH_3COOC_2H_5 + NaOH \longrightarrow}

  3. Question 3

    Chemical Reactions and Equations. This type asked 2 times: 2025, 2026. This one: 2026

    26
    What happens when (i) Calcium carbonate is heated ? (ii) Silver bromide is exposed to sunlight ? (iii) Lead is added to copper (II) chloride solution ? Write balanced chemical equations of the reactions involved in support of your answer.

  4. Question 4

    Chemical Reactions and Equations. This type asked 2 times: 2024, 2026. This one: 2026

    25
    Answer the following : (a) Why should chemical equations be balanced ? (b) Name the oxidising and reducing agent in the following equation : 4Na+O2⟶2Na2O\mathrm{4Na + O_2 \longrightarrow 2Na_2O}

  5. Question 5 (case study, 4 parts)

    Control and Coordination. This type asked 2 times: 2025, 2026. This one: 2026

    Plants exhibit movements in response to various environmental stimuli to adopt and survive in their surroundings. These movements, influenced by external factors such as light, gravity, water and chemicals are regulated by specific plant hormones. For example, the differential growth of plant parts allows them to bend, grow or orient themselves in particular directions. Roots and shoots often show contrasting response to the same stimulus, highlighting the complex mechanisms involved in plant growth and development.
    15 (a)
    Why is hydrotropism essential for plants ?
    15 (b)
    What role does auxin play in the growth of plants ?
    15 (c)
    Differentiate between movement shown by the sensitive plant and tropic movement by plants (Two points).
    15 (c) OR
    How does movement of roots differ from that of shoots in response to gravity and light ?