PYQ Vault

Day 147: CBSE Class 10 Science

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

  1. Question 1

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

    26
    Two wires A and B of same material, having same lengths and diameters 0⋅20{\cdot}2 mm and 0⋅30{\cdot}3 mm respectively, are connected one by one in a circuit. Which one of these two wires will offer more resistance to the flow of current in the circuit ? Justify your answer.

  2. Question 2

    Electricity. Asked once: 2023 (same type asked 4 times)

    36 (b)
    In an electric circuit three bulbs of 100 W each are connected in series to a source. In another circuit set of three bulbs of the same wattage are connected in parallel to the same source. (i) Will the bulb in the two circuits glow with the same brightness ? Justify your answer. (ii) Now, let one bulb in both the circuits get fused. Will the rest of the bulbs continue to glow in each circuit ? Give reason for your answer.

  3. Question 3

    Electricity. Asked once: 2026 (same type asked 4 times)

    39 (A)
    (i) Derive an expression for the equivalent resistance of three resistors connected in parallel with a battery as shown in figure. (ii) Find the values of the electric currents flowing through the resistors R1\mathrm{R_1}, R2\mathrm{R_2} and R3\mathrm{R_3} in the given electric circuit.

  4. Question 4

    Heredity. Asked once: 2022 (same type asked 4 times)

    5 (a)
    What is variation ? List two main reasons that may lead to variation in a population.

  5. Question 5

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

    12
    A cross between two tall pea plants resulted in offsprings having a few dwarf plants. The gene-combination of the parental plants must be

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