PYQ Vault

Day 194: CBSE Class 10 Science

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

  1. Question 1

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

    12
    The breakdown of glucose has taken the following pathway : Glucose →(a)\xrightarrow{\text{(a)}} Pyruvate + Energy →(b)\xrightarrow{\text{(b)}} Lactic acid + Energy The sites ‘a’ and ‘b’ respectively are :

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  2. Question 2

    Light — Reflection and Refraction. Asked once: 2023 (same type asked 4 times)

    30 (a)
    (i) An object of 5 cm height is placed at a distance of 20 cm from the optical centre of a concave lens of focal length 18 cm. Calculate (1) image distance and (2) the magnification in this case. (ii) Compare the values of magnification obtained by a concave lens and a convex lens when both the lenses form virtual images.

  3. Question 3

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

    25
    The heat produced at a point due to concentration of sunlight by a convex lens burns a paper. (a) Explain why it happens. (b) Name the term (in the context of the lens used) given to the point at which the paper starts burning. What does the bright spot formed on the paper represent ?

  4. Question 4

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

    24 (b)
    Define the term absolute refractive index of a medium. A ray of light enters from vacuum to glass of absolute refractive index 1.5. Find the speed of light in glass. The speed of light in vacuum is 3×1083 \times 10^8 m/s.

  5. Question 5

    Magnetic Effects of Electric Current. Asked once: 2023 (same type asked 4 times)

    16
    The resultant magnetic field at point ‘P’ situated midway between two parallel wires (placed horizontally) each carrying a steady current I is

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