PYQ Vault

Day 98: CBSE Class 10 Science

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

  1. Question 1

    How do Organisms Reproduce?. Asked once: 2022 (same type asked 3 times)

    5 (b)
    What is puberty ? Mention any two changes that are common to both boys and girls in early teenage years.

  2. Question 2

    Life Processes. Asked once: 2024 (same type asked 3 times)

    22
    Two test tubes A and B are taken, each containing one mL of starch solution. Add 1 mL of saliva to test tube ‘A’ only and leave both the test tubes undisturbed for a few minutes. Now add a few drops of dilute iodine solution to both the test tubes. (a) Which one of the two test tubes shows change in colour ? Write the changed colour observed in this test tube. (b) What can we conclude from this activity ?

  3. Question 3

    Light — Reflection and Refraction. Asked once: 2025 (same type asked 3 times)

    31
    The power of a lens is −0.25-0.25 D. Based on this information, find out (a) The type of lens and its focal length. (b) The eye defect for which it may be used as a corrective lens. (c) The nature and size of the image formed by this lens when an object is placed between F and 2F from the optical centre of this lens.

  4. Question 4

    Light — Reflection and Refraction. Asked once: 2025 (same type asked 3 times)

    23
    An object is placed at a distance of 30 cm in front of a concave mirror of focal length 20 cm. Use mirror formula to determine the position of the image formed in this case.

  5. Question 5

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

    16
    Other than the abiotic components, which of the given biotic components are not required to make an aquarium with small herbivorous fishes a self-sustaining system ? (i) Aquatic plants and aquatic animals (ii) Terrestrial plants and terrestrial animals (iii) Decomposers as bacteria and fungi (iv) Consumers as clown fishes and sea urchins

    Tap an option to check your answer.