PYQ Vault

Day 10: CBSE Class 10 Science

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

  1. Question 1

    Metals and Non-metals. Asked 3 times: 2024*, 2025*, 2026 (* = numbers or wording changed that year)

    23
    Which gas is evolved when magnesium metal reacts with very dilute HNO3\mathrm{HNO_3} ?

    Tap an option to check your answer.

  2. Question 2

    Metals and Non-metals. Asked 3 times: 2024*, 2025*, 2026 (* = numbers or wording changed that year)

    25
    Show the formation of the following ionic compounds by transfer of electrons between the combining atoms : (i) Sodium oxide (Na2O)(\mathrm{Na_2O}) (ii) Magnesium chloride (MgCl2)(\mathrm{MgCl_2}) (Given : Atomic number : Na = 11, Mg = 12, O = 8, Cl = 17)

  3. Question 3

    The Human Eye and the Colourful World. Asked 3 times: 2023*, 2025*, 2026 (* = numbers or wording changed that year)

    37
    A person is suffering from a defect of vision due to the elongation of his/her eye ball. (a) Write the name of the defect of vision and write the other possible cause of this defect of vision. (b) This defect can be corrected by using a suitable lens. Draw the ray diagram for correction of this defect of vision.

  4. Question 4

    The Human Eye and the Colourful World. Asked 3 times: 2024*, 2025*, 2026 (* = numbers or wording changed that year)

    37
    (a) What is hypermetropia ? (b) Write any one cause of hypermetropia. (c) With the help of a suitable ray diagram, explain how hypermetropia is corrected ?

  5. Question 5

    The Human Eye and the Colourful World. Asked 3 times: 2023*, 2024*, 2026 (* = numbers or wording changed that year)

    34 (A)
    (i) How does the change in curvature of the eye lens helps us in the process of seeing the nearby objects clearly ? (ii) State the range of the power of accommodation of a normal human eye.