PYQ Vault

Day 108: CBSE Class 10 Science

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

  1. Question 1

    Magnetic Effects of Electric Current. Asked once: 2025 (same type asked 2 times)

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    19
    Assertion (A) : In the common domestic circuits the earth wire is connected to a metallic plate buried deep inside the earth. Reason (R) : Earth wire ensures that any leakage of current to the metallic body of the appliance keeps its potential to that of the earth, so the user may not get a severe electric shock.

    Tap an option to check your answer.

  2. Question 2

    Metals and Non-metals. Asked once: 2025 (same type asked 2 times)

    27
    (a) What is a reactivity series of elements ? How is it developed ? Arrange the following elements as they are arranged in the reactivity series : Aluminum, Calcium, Copper, Lead (b) Write balanced chemical equation to show the reaction of iron (III) oxide (Fe2O3)(\mathrm{Fe_2O_3}) with aluminium.

  3. Question 3

    Metals and Non-metals. Asked once: 2024 (same type asked 2 times)

    4
    The metals which are found in both free state as well as combined state are :

    Tap an option to check your answer.

  4. Question 4

    The Human Eye and the Colourful World. Asked once: 2025 (same type asked 2 times)

    15
    Consider the following ray diagram : Here, the angle of incidence and angle of deviation respectively are

    Tap an option to check your answer.

  5. Question 5

    Acids, Bases and Salts. Asked once: 2023 (same type asked 2 times)

    4
    Two salts ‘X’ and ‘Y’ are dissolved in water separately. When phenolphthalein is added to these two solutions, the solution ‘X’ turns pink and the solution ‘Y’ does not show any change in colour, therefore ‘X’ and ‘Y’ are

    Tap an option to check your answer.