PYQ Vault

Day 183: 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: 2023 (same type asked 3 times)

    13
    An object is placed in front of a convex mirror at infinity. According to the New Cartesian Sign Convention, the sign of the focal length and the sign of the image distance in this case are respectively :

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  2. Question 2

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

    30 (A)
    Define the following terms in the context of a diverging mirror : (i) Principal focus (ii) Focal length Draw a labelled ray diagram to illustrate your answer.

  3. Question 3

    Light — Reflection and Refraction. Asked once: 2025 (same type asked 3 times)

    11
    An optical device ‘X’ is placed obliquely in the path of a narrow parallel beam of light. If the emergent beam gets displaced laterally, the device ‘X’ is :

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  4. Question 4 (case study, 4 parts)

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

    A student took three concave mirrors of different focal lengths and performed the experiment to see the image formation by placing an object at different distances with these mirrors as shown in the following table.
    Case No.Object-distanceFocal length
    I45 cm20 cm
    II30 cm15 cm
    III20 cm30 cm
    39 (a)
    List two properties of the image formed in Case I.
    39 (b)
    In which one of the cases given in the table, the mirror will form real image of same size and why ?
    39 (c)
    Name the type of mirror used by dentists. Give reason why do they use such type of mirrors.
    39 (c) OR
    Look at the table and identify the situation (object distance and focal length) which resembles the situation in which concave mirrors are used as shaving mirrors ? Draw a ray diagram to show the image formation in this case.

  5. Question 5

    Magnetic Effects of Electric Current. Asked once: 2023 (same type asked 3 times)

    15
    An alpha particle enters a uniform magnetic field as shown. The direction of motion of the alpha particle is :

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