PYQ Vault

Day 218: CBSE Class 10 Science

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

  1. Question 1

    The Human Eye and the Colourful World. Asked once: 2023 (same type asked 4 times)

    24 (b)
    What is scattering of light ? Why does the clear sky appear blue ?

  2. Question 2

    The Human Eye and the Colourful World. Asked once: 2023 (same type asked 4 times)

    16
    In human eye the part which allows light to enter into the eye is –

    Tap an option to check your answer.

  3. Question 3

    Life Processes. Asked once: 2023 (same type asked 3 times)

    27
    Explain the process of transport of oxygenated and deoxygenated blood in a human body.

  4. Question 4

    Electricity. Asked once: 2023 (same type asked 3 times)

    13
    If four identical resistors, of resistance 8 ohm, are first connected in series so as to give an effective resistance Rs\mathrm{R_s}, and then connected in parallel so as to give an effective resistance Rp\mathrm{R_p}, then the ratio RsRp\dfrac{\mathrm{R_s}}{\mathrm{R_p}} is

    Tap an option to check your answer.

  5. Question 5

    Light — Reflection and Refraction. Asked once: 2023 (same type asked 3 times)

    36
    (a) Draw a ray diagram for showing the convergence of a parallel beam of light by a concave mirror and mark the positions of pole and the centre of curvature in it. (b) An object 4 cm in size is placed at 25 cm in front of a concave mirror of focal length 15 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image ? Find the nature and size of the image. (c) List any two uses of a concave mirror.