PYQ Vault

Day 185: CBSE Class 10 Science

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

  1. Question 1

    Our Environment. Asked once: 2022 (same type asked 3 times)

    5
    “The improvement in our lifestyle has led to the generation of large amount of waste material.” List two reasons to justify this statement.

  2. Question 2

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

    25
    Observe the following diagram showing an image formation in an eye : (a) Identify the defect of vision shown in the figure. (b) List its two causes and suggest a suitable corrective lens to overcome this defect.

  3. Question 3

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

    9 (a)
    State the reason why (i) carbon compounds have low melting and boiling points. (ii) carbon compounds do not conduct electricity. (iii) carbon can form only covalent compounds.

  4. Question 4

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

    9 (b)
    What is a homologous series ? Find the difference in molecular mass between the two consecutive members of a homologous series. State how in a homologous series of carbon compounds the following properties vary with increase in molecular mass : (i) Melting and boiling points (ii) Chemical properties

  5. Question 5

    Carbon and its Compounds. Asked once: 2023 (same type asked 3 times)

    7
    The total number of electrons shared in the formation of an ethyne molecule is :

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