PYQ Vault

Day 24: CBSE Class 10 Science

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

  1. Question 1

    Metals and Non-metals. Asked 2 times: 2024*, 2026 (* = numbers or wording changed that year)

    23
    When an element ‘X’ reacts with water, it starts floating. Identify the element ‘X’ :

    Tap an option to check your answer.

  2. Question 2

    Metals and Non-metals. Asked 2 times: 2025*, 2026 (* = numbers or wording changed that year)

    27 (B)
    (i) Write all the reactions involved in the extraction of Zn from ZnS. (ii) Hydrogen gas is not evolved when most of the metals react with nitric acid. Give reason.

  3. Question 3

    Metals and Non-metals. Asked 2 times: 2023*, 2026 (* = numbers or wording changed that year)

    22
    Solder is an alloy of

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  4. Question 4

    Our Environment. Asked 2 times: 2024*, 2026 (* = numbers or wording changed that year)

    10
    (i) Chlorofluorocarbons (CFCs) have been linked to depletion of ozone layer. In 1987, the United Nations Environment Programme (UNEP) succeeded in making an agreement. State this agreement. (ii) What is the role of ozone in our atmosphere ?

  5. Question 5

    The Human Eye and the Colourful World. Asked 2 times: 2025*, 2026 (* = numbers or wording changed that year)

    35
    (a) Draw the ray diagram for refraction of light through a glass prism and mark angle of refraction and angle of deviation. (b) When the path of a light ray refracted through a glass prism is reversed how will the angle of deviation change ? Explain.