PYQ Vault

Day 224: CBSE Class 10 Science

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

  1. Question 1 (case study, 4 parts)

    Control and Coordination. Asked once: 2026

    A middle-aged person is facing some cognitive changes in himself. His early symptoms included mild forgetfulness. For example, forgetting where he left his mobile or failing to find words to complete his sentences. He was facing problems in driving a car, climbing up and down the stairs, inserting a plug into an outlet. He slowly developed a sad mood and anxiety.
    15 (a)
    What are voluntary actions ?
    15 (b)
    Which part of the brain is responsible for precision of voluntary actions ?
    15 (c) (i)
    Explain the role of the medulla.
    15 (c) (ii)
    How do the animal muscles move ?

  2. Question 2

    Electricity. Asked once: 2026

    36
    (a) Name a device which is used to : (i) Maintain a constant potential difference in a circuit. (ii) Change the electric current in an electric circuit. (b) When the potential difference between the terminals of an electric heater is 110 V, a current of 5 A flows through it. What will be the value of current flowing through it when the potential difference is increased to 220 V ?

  3. Question 3

    Heredity. Asked once: 2025

    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) : A mango seed will germinate to form a mango tree. Reason (R) : Heredity determines the process by which traits and characteristics are reliably inherited from parents to offspring.

    Tap an option to check your answer.

  4. Question 4

    How do Organisms Reproduce?. Asked once: 2025

    24 (b)
    Write the main steps to culture yeast in the laboratory.

  5. Question 5

    Life Processes. Asked once: 2025

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    20
    Assertion (A) : Animals will not get energy if they eat (consume) coal as food. Reason (R) : Specific enzymes are needed for the breakdown of a particular food.

    Tap an option to check your answer.