PYQ Vault

Day 2: CBSE Class 10 Science

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

  1. Question 1

    Heredity. Asked 4 times: 2022*, 2024*, 2025*, 2026 (* = numbers or wording changed that year)

    13
    A blue colour flower (BB) bearing plant is crossed with a plant with white coloured flowers (bb). (a) State the colour of the flowers you would expect in their F1\mathrm{F_1} progeny. (b) What must be the percentage of white flower plants in the F2\mathrm{F_2} generation, if the F1\mathrm{F_1} plants are self-pollinated ? (c) State the expected ratio of genotypes BB and bb in F2\mathrm{F_2} progeny.

  2. Question 2

    Life Processes. Asked 4 times: 2023*, 2024*, 2025*, 2026 (* = numbers or wording changed that year)

    7
    Opening of stomata is regulated by :

    Tap an option to check your answer.

  3. Question 3

    Life Processes. Asked 4 times: 2023*, 2024*, 2025*, 2026 (* = numbers or wording changed that year)

    16 (B)
    (a) Draw a well-labelled diagram of nephron and label atleast 4 of its parts. (b) Write the role of capillary cluster inside Bowman’s capsule. (c) What is meant by selective reabsorption ?

  4. Question 4

    Magnetic Effects of Electric Current. Asked 4 times: 2023*, 2024*, 2025*, 2026 (* = numbers or wording changed that year)

    39 (b)
    (i) With the help of a diagram, describe an activity in brief to show that a current-carrying straight conductor produces a magnetic field around it. (ii) Two straight current-carrying conductors (A) and (B) are shown in the figures below : (I) Mark the direction of the magnetic fields around these current-carrying conductors (A) and (B). (II) Compare the strengths of magnetic fields produced (1) at points P and Q and (2) at points Q and R due to these current-carrying conductors, qualitatively.

  5. Question 5

    Magnetic Effects of Electric Current. Asked 4 times: 2022*, 2023*, 2025*, 2026 (* = numbers or wording changed that year)

    37
    On the basis of the given circuit arrangement, answer the following questions : (a) What happens to the rod AB when the key K is closed and why ? (b) Name and state the rule that determines this behaviour of the rod AB in the above situation.