PYQ Vault

Day 210: 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 3 times)

    27
    (a) Sodium metal is stored under kerosene oil. Why ? (b) Some metal oxides are soluble in water. What are the aqueous solutions of these oxides called ? Write one example of such a solution. (c) At ordinary temperature the surface of metals such as magnesium, aluminium, zinc etc. is covered with a thin layer. What is the composition of this layer ? State its importance.

  2. Question 2

    Our Environment. Asked once: 2024 (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) : Producers are capable of using light energy from the sun to make food available in an ecosystem. Reason (R) : All food chains in an ecosystem start with a producer.

    Tap an option to check your answer.

  3. Question 3

    Chemical Reactions and Equations. Asked once: 2023 (same type asked 3 times)

    3
    Select the appropriate state symbols of the products given as X and Y in the following chemical equation by choosing the correct option from table given below : Zn(s)+H2SO4(l)→ZnSO4(X)+H2(Y)\mathrm{Zn_{(s)} + H_2SO_{4(l)} \rightarrow ZnSO_{4(X)} + H_{2(Y)}}

    Tap an option to check your answer.

  4. Question 4

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

    13
    Consider the following combinations of resistors : The combinations having equivalent resistance 1 Ω1\,\Omega is/are :

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  5. Question 5

    Light — Reflection and Refraction. Asked once: 2024 (same type asked 3 times)

    36 (a)
    (i) State laws of reflection of light. (ii) An object of height 5⋅05{\cdot}0 cm is placed at 15 cm in front of a concave mirror of focal length 10 cm. At what distance from the mirror should a screen be placed, so that a focussed image is obtained on it ? Find the height of the image.