PYQ Vault

Day 175: CBSE Class 10 Science

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

  1. Question 1

    Life Processes. Asked once: 2023 (same type asked 4 times)

    29 (b)
    (i) In the human respiratory system, name the following : (I) Part where air is filtered by fine hairs and mucus lining (II) Part which separates chest cavity from abdominal cavity (III) Balloon like structures where exchange of gases takes place (IV) The two large air passages that lead from trachea to the lungs (ii) List any two characteristics of lungs which make it an efficient respiratory surface.

  2. Question 2

    Life Processes. Asked once: 2025 (same type asked 4 times)

    12
    In aerobic respiration, the steps are : breakdown of glucose to pyruvate and its further conversion to carbon dioxide. Both processes respectively occur in –

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  3. Question 3

    Light — Reflection and Refraction. Asked once: 2024 (same type asked 4 times)

    36 (a)
    (i) Draw a ray diagram to show the path of the refracted ray in each of the following cases : A ray of light incident on a concave lens (1) parallel to its principal axis, and (2) is directed towards its principal focus. (ii) A 4 cm tall object is placed perpendicular to the principal axis of convex lens of focal length 24 cm. The distance of object from the lens is 16 cm. Find the position and size of image formed.

  4. Question 4

    Light — Reflection and Refraction. Asked once: 2024 (same type asked 4 times)

    36
    (a) Upper half of a convex lens is covered with a black paper. Draw a ray diagram to show the formation of image of an object placed at a distance of 2F from such a lens. Mention the position and nature of the image formed. State the observable difference in the image obtained if the lens is uncovered. Give reason to justify your answer. (b) An object is placed at a distance of 30 cm from the optical centre of a concave lens of focal length 15 cm. Use lens formula to determine the distance of the image from the optical centre of the lens.

  5. Question 5

    Light — Reflection and Refraction. Asked once: 2024 (same type asked 4 times)

    15
    The speed of light in vacuum is 3×1083 \times 10^8 m/s. If the speed of light in a medium is 2.25×1082.25 \times 10^8 m/s, the absolute refractive index of the medium is :

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