PYQ Vault

Day 92: CBSE Class 10 Science

5 questions (8 parts). Try each one first, then open its answer.

  1. Question 1

    Light — Reflection and Refraction. Asked once: 2026 (same type asked 3 times)

    33
    With the help of above given ray diagram, calculate the angle of refraction. Given that the refractive index of Medium 2 with respect to Medium 1 is 3\sqrt{3}.

  2. Question 2 (case study, 4 parts)

    Light — Reflection and Refraction. Asked once: 2026 (same type asked 3 times)

    The above ray diagram is to show image formation by a reflecting telescope. Reflecting telescope revolutionized our way of looking into the sky. Reflecting telescopes employ large mirrors to gather and focus light rather than relying solely on lenses as we do in the refracting telescopes. These telescopes utilize precisely shaped and polished mirrors to capture incoming light and reflect it to a focal point, where the telescope forms an image for observation.
    38 (a)
    What kind of image of a star is seen by the observer in the eye-piece ?
    38 (b)
    What kind of mirror is used in this reflecting telescope ?
    38 (c)
    Explain with the reason, what kind of optical device (type of lens or mirror) is used at the eye-piece.
    38 (c) OR
    What is the role of plane mirror in image formation by this telescope ?

  3. Question 3

    Magnetic Effects of Electric Current. Asked once: 2025 (same type asked 3 times)

    32
    Consider a rectangular cardboard having two holes P and Q through which a current carrying circular loop has been inserted as shown in the diagram. (a) Make this diagram on your answer sheet and draw three magnetic field lines, one each passing through the points 1 (near P), 2 (at the centre of the loop) and 3 (near Q). (b) List two factors on which the intensity of the magnetic field produced at the centre of the loop depends. (c) Name the rule you will apply to determine the direction of magnetic field produced due to a current carrying straight conductor.

  4. Question 4

    Magnetic Effects of Electric Current. Asked once: 2026 (same type asked 3 times)

    36
    (a) Describe an activity to show that a current carrying conductor, placed in an external magnetic field experiences a force. (b) Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally towards the front wall from the back wall, is deflected by a strong magnetic field to your right side. Find the direction of the magnetic field.

  5. Question 5

    Magnetic Effects of Electric Current. Asked once: 2024 (same type asked 3 times)

    16
    Study the following statements : (a) A fuse in a circuit prevents damage to the circuit due to overloading. (b) Total resistance in a circuit increases due to overloading. (c) During short circuiting the current in the circuit abruptly increases. (d) In order that each appliance has same current, they are connected in parallel to each other. The correct statements are

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