PYQ Vault

Day 170: CBSE Class 10 Science

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

  1. Question 1

    Electricity. Asked once: 2024 (same type asked 5 times)

    32
    A 2000 W heater has a resistance of about 25 Ω25\,\Omega, whereas a 100 W bulb has a resistance of 500 Ω500\,\Omega. When 220 V is applied on these, then which of the two (a) can carry large currents ? (b) may be used with an electrical circuit having 1⋅01{\cdot}0 A rating ? (c) will be fitted with a 15 A electric board and not with a 5 A electric board ? Justify your answer in each case.

  2. Question 2

    Magnetic Effects of Electric Current. Asked once: 2024 (same type asked 5 times)

    25 (b)
    Name the device used to magnetise a piece of magnetic material. Draw a labelled diagram to show the arrangement used for the magnetisation of a cylinder made of soft iron.

  3. Question 3

    Magnetic Effects of Electric Current. Asked once: 2023 (same type asked 5 times)

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    20
    Assertion (A) : Two magnetic field lines around a current carrying straight wire do not intersect each other. Reason (R) : The magnitude of the magnetic field produced at a given point increases as the current through the wire increases.

    Tap an option to check your answer.

  4. Question 4

    Our Environment. Asked once: 2025 (same type asked 5 times)

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    20
    Assertion (A) : Use of jute bags for shopping reduces pollution. Reason (R) : Jute is biodegradable and its bag may be reused as and when needed.

    Tap an option to check your answer.

  5. Question 5

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

    34 (b)
    Carry out the following conversions, stating the condition(s) for each : (i) Ethanol ⟶\longrightarrow Ethene (ii) Ethene ⟶\longrightarrow Ethane (iii) Ethane ⟶\longrightarrow Chloroethane (iv) Ethanol ⟶\longrightarrow Ethanoic acid (v) Ethanoic acid ⟶\longrightarrow Ethyl ethanoate