PYQ Vault

Day 119: CBSE Class 10 Science

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

  1. Question 1

    The Human Eye and the Colourful World. Asked once: 2025 (same type asked 4 times)

    15
    The phenomenon responsible for making the smoke particles visible when a beam of sunlight enters a smoke filled room through a narrow hole is :

    Tap an option to check your answer.

  2. Question 2

    The Human Eye and the Colourful World. Asked once: 2026 (same type asked 4 times)

    34 (a)
    How does the focal length of eye lens change as the distance of the object from the eyes is altered ? Explain.

  3. Question 3

    Carbon and its Compounds. Asked once: 2023 (same type asked 4 times)

    7
    Consider the structures of the three cyclic carbon compounds A, B and C given below and select the correct option from the following :

    Tap an option to check your answer.

  4. Question 4

    Electricity. Asked once: 2025 (same type asked 4 times)

    26
    A voltage source sends a current of 2 A to a resistor of 40 Ω40\,\Omega connected across it for 5 minutes. Calculate the electrical energy supplied by the source.

  5. Question 5 (case study, 4 parts)

    Electricity. Asked once: 2024 (same type asked 4 times)

    Study the following circuit :
    39 (a)
    Find the value of total resistance between the points A and B.
    39 (b)
    Find the resistance between the points B and C.
    39 (c) (i)
    Calculate the current drawn from the battery, when the key is closed.
    39 (c) (ii)
    In the above circuit, the 16 Ω16\,\Omega resistor or the parallel combination of two resistors of 8 Ω8\,\Omega, which one of the two will have more potential difference across its two ends ? Justify your answer.