PYQ Vault

Day 18: CBSE Class 10 Science

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

  1. Question 1

    Control and Coordination. Asked 2 times: 2025*, 2026 (* = numbers or wording changed that year)

    10 (b)
    Electrical impulse is an excellent means to transmit information in the animal body, but there are some limitations to the use of electrical impulses. State any two limitations.

  2. Question 2

    Control and Coordination. Asked 2 times: 2023*, 2026 (* = numbers or wording changed that year)

    3
    Walking in a straight line and riding a bicycle are activities which are possible due to coordination of which part of the brain ? (Part of the Brain), (Name of the area of the Brain)

    Tap an option to check your answer.

  3. Question 3

    Electricity. Asked 2 times: 2023*, 2026 (* = numbers or wording changed that year)

    39 (B)
    (i) Define the SI unit of power. Express the electric power of an electric appliance in terms of potential difference and current flowing through it. (ii) In a house, 3 bulbs of 100 W each, are lit for 5 hours daily and an electric heater of 1.0 kW is used for half an hour daily. Calculate the total energy consumed in a month of 30 days and its cost at the rate of ₹ 3.60 per kWh. (iii) Convert the commercial unit of electric energy into Joule (J).

  4. Question 4

    Electricity. Asked 2 times: 2025*, 2026 (* = numbers or wording changed that year)

    39 (b)
    (i) Two lamps ‘A’ and ‘B’ of rating 50 W; 220 V and 100 W, 220 V are connected in series combination. Find out the ratio of the resistances (RA:RB)(R_A : R_B) of these lamps. (ii) Derive the expression for the equivalent resistance of three resistors R1R_1, R2R_2 and R3R_3 connected in parallel combination.

  5. Question 5

    Electricity. Asked 2 times: 2024*, 2026 (* = numbers or wording changed that year)

    37
    The values of current II flowing in a given resistor for the corresponding values of potential difference VV applied across the ends of resistor are given below in the table :
    II (Amperes)0⋅40{\cdot}40⋅80{\cdot}81⋅21{\cdot}21⋅61{\cdot}62⋅02{\cdot}0
    VV (Volts)1⋅21{\cdot}22⋅42{\cdot}43⋅63{\cdot}64⋅84{\cdot}86⋅06{\cdot}0
    Plot a graph between VV and II and calculate the resistance of that resistor.