PYQ Vault

Day 223: CBSE Class 10 Science

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

  1. Question 1

    Life Processes. Asked once: 2025

    5
    The essential element taken up from the soil by the plants to synthesize proteins is :

    Tap an option to check your answer.

  2. Question 2

    Magnetic Effects of Electric Current. Asked once: 2025

    36 (a)
    The given figure shows the current passing through the straight conductor XY. (i) Copy the diagram and draw the magnetic field lines when current flows from conductor X to Y. (ii) Name and state the rule used in determining the direction of the magnetic field lines in the situation given above. (iii) State Fleming’s left hand rule. Using this rule, determine the direction of force applied on an electron entering a uniform magnetic field as shown in the figure.

  3. Question 3

    Acids, Bases and Salts. Asked once: 2026

    18
    Rain water is called ‘acid rain’ when its :

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  4. Question 4

    Carbon and its Compounds. Asked once: 2026

    29 (a)
    (i) Give reasons for the following : (I) Covalent compounds are poor conductor of electricity. (II) Soap does not form lather in hard water. (III) Carbon shows catenation but silicon does not. (ii) Write chemical equations for the following : (I) Oxidation of ethanol by acidified K2Cr2O7\mathrm{K_2Cr_2O_7}. (II) Hydrogenation of ethene.

  5. Question 5

    Chemical Reactions and Equations. Asked once: 2026

    26
    Define the following terms : (i) Corrosion (ii) Rancidity (iii) Exothermic reaction