PYQ Vault

Day 177: CBSE Class 10 Science

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

  1. Question 1

    Metals and Non-metals. Asked once: 2024 (same type asked 4 times)

    3
    A metal and a non-metal that exists in liquid state at the room temperature are respectively :

    Tap an option to check your answer.

  2. Question 2

    Metals and Non-metals. Asked once: 2025 (same type asked 4 times)

    28
    Samples of four metals A, B, C and D were added one by one to the following solutions. The results obtained were tabulated as follows :
    Metal / SolutionIron SulphateCopper SulphateZinc SulphateAluminium Sulphate
    A–DisplacementNo reactionNo reaction
    BDisplacementDisplacementDisplacement–
    CDisplacement?–No reaction
    DNo reactionNo reactionNo reactionNo reaction
    Use the table above to answer the following questions about metals A, B, C and D : (i) Which is the least reactive metal? (ii) What would be observed if C is added to a solution of copper sulphate? (iii) Arrange the metals A, B, C and D in the order of their decreasing reactivity.

  3. Question 3

    Our Environment. Asked once: 2025 (same type asked 4 times)

    26
    “Excessive use of chemicals and pesticides in agriculture adversely effect the environment.” Justify this statement.

  4. Question 4

    Our Environment. Asked once: 2024 (same type asked 4 times)

    33 (A)
    Plants →\rightarrow Deer →\rightarrow Lion In the given food chain, what will be the impact of removing all the organisms of second trophic level on the first and third trophic level? Will the impact be the same for the organisms of the third trophic level in the above food chain if they were present in a food web? Justify.

  5. Question 5

    Our Environment. Asked once: 2025 (same type asked 4 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) : The amount of ozone in the atmosphere began to drop sharply in the 1980s. Reason (R) : The oxygen atoms combine with molecular oxygen to form ozone.

    Tap an option to check your answer.