PYQ Vault

Day 23: CBSE Class 10 Science

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

  1. Question 1

    Light — Reflection and Refraction. Asked 2 times: 2025*, 2026 (* = numbers or wording changed that year)

    33
    When an incident ray of light enters in a medium ‘X’ from medium ‘Y’, it bends away from the normal. Comment about the following : (a) Speed of light in medium ‘X’ with respect to the speed of light in medium of ‘Y’. (b) Optical density of medium ‘X’ with respect to the optical density of medium ‘Y’. Give reason for your answer in each case.

  2. Question 2

    Light — Reflection and Refraction. Asked 2 times: 2025*, 2026 (* = numbers or wording changed that year)

    34
    A mirror always forms a virtual, erect and diminished image. Identify the mirror and draw a labelled ray diagram for image formation by this mirror.

  3. Question 3

    Magnetic Effects of Electric Current. Asked 2 times: 2025*, 2026 (* = numbers or wording changed that year)

    39 (B)
    (i) List three possible reasons of short-circuiting in an electric circuit. (ii) In case of overload, will the fuse protect to given electric circuit from damage ? Justify your answer. (iii) For an electric heater rated as 220 V, 2200 W, what should be the minimum rating of fuse used with it ?

  4. Question 4

    Magnetic Effects of Electric Current. Asked 2 times: 2025*, 2026 (* = numbers or wording changed that year)

    39 (a)
    A person was repairing an electric heater. He observed that there were three different connecting wires of three different colours in the cable attached to the heater. (i) What are these three different wires called ? Name them colourwise. (ii) What is the value of standard potential difference at which electricity is supplied in Indian homes for lighting ? (iii) What is the role of (I) earthing and (II) fuse in domestic electric circuits ?

  5. Question 5

    Magnetic Effects of Electric Current. Asked 2 times: 2023*, 2026 (* = numbers or wording changed that year)

    39 (A)
    (i) List any two features of the electric current used in the houses of India. (ii) Write any two differences between direct current and an alternating current. (iii) How will you identify live wire and neutral wire in a domestic electric circuit ?