PYQ Vault

Day 62: CBSE Class 10 Science

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

  1. Question 1

    Our Environment. This type asked 3 times: 2023, 2024, 2025. This one: 2025

    16
    The percentage of solar energy which is not converted into food energy by the leaves of green plants in a terrestrial ecosystem is about :

    Tap an option to check your answer.

  2. Question 2

    Carbon and its Compounds. This type asked 3 times: 2022, 2023, 2024. This one: 2024

    22
    Distinguish between a saturated and an unsaturated hydrocarbon by flame test. List the products of combustion reaction of a saturated hydrocarbon.

  3. Question 3

    How do Organisms Reproduce?. This type asked 3 times: 2022, 2023, 2024. This one: 2024

    35 (B)
    (i) Draw a diagram showing spore formation in Rhizopus and label the (a) reproductive and (b) non-reproductive parts. Why does Rhizopus not multiply on a dry slice of bread ? (ii) Name and explain the process by which reproduction takes place in Hydra.

  4. Question 4

    Acids, Bases and Salts. This type asked 2 times: 2023, 2026. This one: 2026

    23
    How will you protect yourself from the heat generated while diluting a concentrated acid ?

    Tap an option to check your answer.

  5. Question 5

    Acids, Bases and Salts. This type asked 2 times: 2024, 2026. This one: 2026

    25
    Define the following terms : (i) Olfactory indicator (ii) Water of crystallization