PYQ Vault

Day 201: CBSE Class 10 Science

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

  1. Question 1

    Metals and Non-metals. Asked once: 2023 (same type asked 3 times)

    28
    (a) Copper reacts with a moist gas ‘A’ in the air and slowly loses its shiny brown surface. It turns green. Identify ‘A’ and the substance of the green coating formed on the surface of copper. (b) How is copper obtained from its sulphide ore ? Write the chemical equations for the reaction involved in its extraction.

  2. Question 2

    Our Environment. Asked once: 2025 (same type asked 3 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) : All organisms can make organic compounds like sugar and starch from inorganic substances using radiant energy of the sun. Reason (R) : The organisms which can produce food by photosynthesis are called producers.

    Tap an option to check your answer.

  3. Question 3

    Our Environment. Asked once: 2024 (same type asked 3 times)

    26
    Define the terms biodegradable and non-biodegradable substance. Classify the following items into these two categories : Newspapers, Glass bottles, Polythene bags, Vegetable peels

  4. Question 4

    The Human Eye and the Colourful World. Asked once: 2023 (same type asked 3 times)

    25 (A)
    Observe the following diagram and answer the questions following it : (i) Identify the defect of vision shown. (ii) List its two causes. (iii) Name the type of lens used for the correction of this defect.

  5. Question 5

    Carbon and its Compounds. Asked once: 2022 (same type asked 3 times)

    9 (b)
    (a) Draw the electron dot structure for ethyne. (b) List two differences between the properties exhibited by covalent compounds and ionic compounds.