PYQ Vault

Day 212: CBSE Class 10 Science

5 questions (8 parts). Try each one first, then open its answer.

  1. Question 1

    How do Organisms Reproduce?. Asked once: 2024 (same type asked 4 times)

    8
    In the given diagram the leaf shown belongs to which plant ?

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  2. Question 2

    Life Processes. Asked once: 2023 (same type asked 4 times)

    5
    Given below are two columns, Column I shows enzymes secreted by the glands in the alimentary canal of human beings and Column II indicates the components of food on which enzymes act. Choose the options showing correct matching :

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  3. Question 3

    Life Processes. Asked once: 2023 (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.
    18
    Assertion (A) : The anaerobic respiration which takes place in yeast, has one of the end products as an acid. Reason (R) : During anaerobic respiration, there is incomplete breakdown of glucose.

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  4. Question 4

    Light — Reflection and Refraction. Asked once: 2023 (same type asked 4 times)

    36
    (a) An object is placed in front of a convex lens of focal length f. If the distance of the object from the lens is 2f, draw a ray diagram to show the formation of the image. Write the value of magnification in this case. (b) A student has focussed the image of a candle flame on a white screen using a convex lens. The situation is as given below : Length of the flame = 2 cm Focal length of the lens = 12 cm Distance of the flame from the lens = 16 cm If the flame is perpendicular to the principal axis of the lens, calculate the values of the following : (i) Distance of the image from the lens (ii) Length of the image formed

  5. Question 5 (case study, 4 parts)

    Metals and Non-metals. Asked once: 2023 (same type asked 4 times)

    Almost all metals combine with oxygen to form metal oxides. Metal oxides are generally basic in nature. But some metal oxides show both basic as well as acidic behaviour. Different metals show different reactivities towards oxygen. Some react vigorously while some do not react at all.
    37 (a)
    What happens when copper is heated in air ? (Give the equation of the reaction involved).
    37 (b)
    Why are some metal oxides categorized as amphoteric ? Give one example.
    37 (c)
    Complete the following equations : (i) Na2O(s)+H2O(l)→\mathrm{Na_2O_{(s)} + H_2O_{(l)} \rightarrow} (ii) Al2O3+2 NaOH→\mathrm{Al_2O_3 + 2\,NaOH \rightarrow}
    37 (c) OR
    On burning Sulphur in oxygen a colourless gas is produced. (i) Write chemical equation for the reaction. (ii) Name the gas formed. (iii) State the nature of the gas. (iv) What will be the action of this on a dry litmus paper ?