PYQ Vault

Day 140: CBSE Class 10 Science

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

  1. Question 1

    Carbon and its Compounds. Asked once: 2024 (same type asked 2 times)

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    17
    Assertion (A) : Some vegetable oils are healthy. Reason (R) : Vegetable oils generally have long unsaturated carbon chains.

    Tap an option to check your answer.

  2. Question 2

    Carbon and its Compounds. Asked once: 2025 (same type asked 2 times)

    35 (a)
    (a) Define the term “homologous series of carbon compounds”. Write a homologous series of compounds having functional group −CHO-\mathrm{CHO}. (b) Design an experiment to distinguish between an alcohol and a carboxylic acid. Also write chemical equation for that case in which reaction occurs.

  3. Question 3

    Chemical Reactions and Equations. Asked once: 2025 (same type asked 2 times)

    21 (a)
    List the possible sources of energy required in decomposition reactions. Illustrate any one with a suitable example.

  4. Question 4

    Control and Coordination. Asked once: 2023 (same type asked 2 times)

    22 (a)
    How is an electric impulse created in human nervous system ? Identify the parts of a neuron which helps the nerve impulse to travel (i) towards the cell body (ii) away from the cell body

  5. Question 5

    Electricity. Asked once: 2024 (same type asked 2 times)

    34 (B)
    Draw a schematic diagram of a circuit consisting of a battery of six 2V cells, a 6 Ω6\,\Omega resistor, a 12 Ω12\,\Omega resistor and a 18 Ω18\,\Omega resistor and a plug key all connected in series. Calculate the following (when key is closed) : (i) Electric current flowing in the circuit. (ii) Potential difference across 18 Ω18\,\Omega resistor. (iii) Electric power consumed in 18 Ω18\,\Omega resistor.