PYQ Vault

Day 61: CBSE Class 10 Science

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

  1. Question 1

    How do Organisms Reproduce?. This type asked 3 times: 2022, 2023, 2025. This one: 2023

    9
    During adolescence, reproductive phase starts and :

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  2. Question 2

    Life Processes. This type asked 3 times: 2023, 2024, 2025. This one: 2025

    8
    Secretion of less saliva in mouth will effect the conversion of :

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  3. Question 3

    Light — Reflection and Refraction. This type asked 3 times: 2023, 2024, 2025. This one: 2025

    36 (a)
    (i) The power of a lens ‘X’ is −2⋅5-2{\cdot}5 D. Name the lens and determine its focal length in cm. For which eye defect of vision will an optician prescribe this type of lens as a corrective lens ? (ii) “The value of magnification ‘m’ for a lens is −2-2.” Using new Cartesian Sign Convention and considering that an object is placed at a distance of 20 cm from the optical centre of this lens, state : (I) the nature of the image formed; (II) size of the image compared to the size of the object; (III) position of the image, and (IV) sign of the height of the image. (iii) The numerical values of the focal lengths of two lenses A and B are 10 cm and 20 cm respectively. Which one of the two will show higher degree of convergence/divergence ? Give reason to justify your answer.

  4. Question 4

    Light — Reflection and Refraction. This type asked 3 times: 2023, 2024, 2025. This one: 2025

    21
    An object is placed at a distance of 10 cm in front of a concave mirror of focal length 15 cm. Use mirror formula to determine the position of the image formed by this mirror.

  5. Question 5

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

    15
    The examples of natural and manmade (artificial) ecosystems are respectively

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