PYQ Vault

Day 164: CBSE Class 10 Science

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

  1. Question 1

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

    27
    (i) While electrolysing water before passing the current some drops of an acid are added. Why ? Name the gases liberated at cathode and anode. Write the relationship between the volume of gas collected at anode and the volume of gas collected at cathode. (ii) What is observed when silver chloride is exposed to sunlight ? Give the type of reaction involved.

  2. Question 2

    Chemical Reactions and Equations. Asked once: 2024 (same type asked 3 times)

    21
    When magnesium ribbon is burnt in air, an ash of white colour is produced. Write chemical equation for the reaction giving the chemical name of the ash produced. State the type of chemical reaction giving justification for your answer.

  3. Question 3

    Chemical Reactions and Equations. Asked once: 2024 (same type asked 3 times)

    27
    Write one chemical equation each for the chemical reaction in which the following have taken place : (i) Change in colour (ii) Change in temperature (iii) Formation of precipitate Mention colour change/temperature change (rise/fall)/compound precipitated along with equation.

  4. Question 4

    Control and Coordination. Asked once: 2024 (same type asked 3 times)

    23 (A)
    How is the movement of leaves of a sensitive plant different from the downward movement of the roots ?

  5. Question 5

    Electricity. Asked once: 2023 (same type asked 3 times)

    15
    An electric kettle consumes 1 kW of electric power when operated at 220 V. The minimum rating of the fuse wire to be used for it is

    Tap an option to check your answer.