PYQ Vault

Day 95: CBSE Class 10 Science

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

  1. Question 1

    The Human Eye and the Colourful World. Asked once: 2025 (same type asked 3 times)

    14
    A boy while reading a book, keeps it much beyond 25 cm from his eyes. This defect of vision has arised because of

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  2. Question 2

    The Human Eye and the Colourful World. Asked once: 2025 (same type asked 3 times)

    25 (b)
    What is a rainbow ? “We see a rainbow in the sky only after the rainfall.” Why ?

  3. Question 3

    Acids, Bases and Salts. Asked once: 2024 (same type asked 3 times)

    34 (a)
    (i) Five solutions A, B, C, D and E when tested with pH paper showed pH as 4, 1, 13, 7 and 10 respectively. Which solution is : (1) Strongly acidic (2) Strongly alkaline (3) Weakly acidic (4) Neutral and (5) Weakly alkaline ? Arrange the solutions in increasing order of H+\mathrm{H^+} ion concentration. (ii) Write the name and formula of (1) an acidic salt and (2) a basic salt giving the name of the parent acid and parent base used to form the salt in each case.

  4. Question 4

    Acids, Bases and Salts. Asked once: 2024 (same type asked 3 times)

    4
    An aqueous solution of sodium chloride is prepared in distilled water. The pH of this solution is :

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  5. Question 5

    Carbon and its Compounds. Asked once: 2024 (same type asked 3 times)

    22
    The melting and boiling points of carbon compounds are generally low and they are largely non-conductors of electricity. State two conclusions based on these two properties.