PYQ Vault

Day 54: CBSE Class 10 Science

5 questions (6 parts). Try each one first, then open its answer.

  1. Question 1

    Life Processes. This type asked 3 times: 2023, 2025, 2026. This one: 2026

    7
    In human beings the oxygen rich blood is pumped out to the body by :

    Tap an option to check your answer.

  2. Question 2 (case study, 2 parts)

    Life Processes. This type asked 3 times: 2024, 2025, 2026. This one: 2026

    Not all plants carry out photosynthesis by the same mechanism. In most plants, it depends directly on gaseous carbon dioxide that diffuses into the leaf. However, some plants can store carbon dioxide in the vacuole of the leaf cells as part of a complex carbon compound. This compound is transported to the chloroplast and releases carbon dioxide when required for photosynthesis. This special mechanism is believed to have evolved as an adaptation in such plants which do not open stomata during the daytime to conserve water for survival in dry conditions (desert conditions).
    15 (a)
    (i) Which process in these plants is minimised to help the plants survive in dry conditions ? (ii) Which part of the leaf is responsible for exchange of gases during photosynthesis ?
    15 (b)
    (i) List the events that occur during the process of photosynthesis. (ii) When are such desert plants likely to take in carbon dioxide from the environment, unlike other plants ? (iii) Draw a labelled diagram of stomata with open stomatal pore.

  3. Question 3

    Light — Reflection and Refraction. This type asked 3 times: 2023, 2025, 2026. This one: 2026

    35
    (a) Write the expression for the magnification produced by a lens in terms of object distance and image distance. (b) A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. Calculate the size of the image formed, if the distance of the object from the lens is 10 cm.

  4. Question 4

    Light — Reflection and Refraction. This type asked 3 times: 2023, 2024, 2026. This one: 2026

    30
    From the following options choose the one which gives negative magnification greater than one :

    Tap an option to check your answer.

  5. Question 5

    Light — Reflection and Refraction. This type asked 3 times: 2023, 2025, 2026. This one: 2026

    34
    Redraw the following ray diagrams in your answer book and show the path of reflected/refracted ray :