PYQ Vault

Day 99: CBSE Class 10 Science

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

  1. Question 1

    Our Environment. Asked once: 2025 (same type asked 3 times)

    26
    Write the percentage of the energy of sunlight captured by green plants, to convert it into food energy. Explain the fate of this energy when green plants are eaten by primary consumers.

  2. Question 2

    Carbon and its Compounds. Asked once: 2023 (same type asked 3 times)

    34 (A)
    (i) Draw the structure of the following compounds : (a) Butanoic acid (b) Chloropentane (ii) How are structure (i) and structure (ii) given below related to one another ? Give reason to justify your answer. Draw one more possible structure for above case. (iii) Differentiate between saturated and unsaturated carbon compounds on the basis of their general formula.

  3. Question 3

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

    35 (a)
    (i) What are spores ? On which structures are they formed ? How do they overcome unfavourable conditions ? Name the organism which multiplies with the help of these structures. (ii) Give two reasons why some plants are grown by the method of vegetative propagation. List two methods used to grow plants vegetatively.

  4. Question 4

    Acids, Bases and Salts. Asked once: 2026 (same type asked 2 times)

    27 (B)
    (a) Name the acid present in ant’s sting. (b) Give reason : (i) While diluting an acid, it is recommended that the acid should be added to water. (ii) Baking soda is used as an antacid.

  5. Question 5

    Acids, Bases and Salts. Asked once: 2024 (same type asked 2 times)

    2
    Select a pair of natural indicator from the following :

    Tap an option to check your answer.