PYQ Vault

Day 150: CBSE Class 10 Science

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

  1. Question 1

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

    36 (b)
    (i) Define principal axis of a lens. Draw a ray diagram to show what happens when a ray of light parallel to the principal axis of a concave lens passes through it. (ii) The focal length of a concave lens is 20 cm. At what distance from the lens should a 5 cm tall object be placed so that its image is formed at a distance of 15 cm from the lens ? Also calculate the size of the image formed.

  2. Question 2

    Light — Reflection and Refraction. Asked once: 2025 (same type asked 4 times)

    25 (b)
    A ray of light after refraction from a convex lens emerges parallel to its principal axis. (i) Draw a labelled ray diagram to show it. (ii) In this case, the incident ray before refraction from the lens passes through a point on its principal axis. Name the point.

  3. Question 3

    Light — Reflection and Refraction. Asked once: 2025 (same type asked 4 times)

    11
    If the absolute refractive indices of two media X and Y are 65\dfrac{6}{5} and 43\dfrac{4}{3} respectively, then the refractive index of Y with respect to X will be :

    Tap an option to check your answer.

  4. Question 4

    Magnetic Effects of Electric Current. Asked once: 2024 (same type asked 4 times)

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    20
    Assertion (A) : The deflection of a compass needle placed near a current carrying wire decreases when the magnitude of an electric current in the wire is increased. Reason (R) : Strength of the magnetic field at a point due to a current carrying conductor increases on increasing the current in the conductor.

    Tap an option to check your answer.

  5. Question 5

    Magnetic Effects of Electric Current. Asked once: 2026 (same type asked 4 times)

    39 (A)
    (i) State the rule which gives the direction of force acting on a current carrying conductor placed in a uniform magnetic field. (ii) Name any two devices which work on the basis of an interaction between magnetic field and current carrying conductor. (iii) Observe the given diagrams : Comment on the magnitude of force on electron in both the cases and give reason for your answer.