PYQ Vault

Day 91: CBSE Class 10 Science

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

  1. Question 1

    Life Processes. Asked once: 2026 (same type asked 3 times)

    6
    Study the given diagram of the heart, with blood vessels marked ‘1’ and ‘2’. From the following statements, establish the relationship between heart and /or the two blood vessels : (i) Blood vessel 1 - It carries carbon dioxide rich blood to the lungs. (ii) Blood vessel 2 - It carries oxygen rich blood from the lungs. (iii) Blood vessel 2 - Left atrium relaxes as it receives blood from this blood vessel. (iv) Blood vessel 1 - Right atrium has thick wall as it has to pump blood to this vessel. The option with correct statements is :

    Tap an option to check your answer.

  2. Question 2 (case study, 4 parts)

    Life Processes. Asked once: 2025 (same type asked 3 times)

    The maintenance functions of all living organisms must go on even when they are not doing anything particular. Even when we are just sitting in a class or even asleep, this maintenance job has to go on. These maintenance processes require energy to prevent damage and break-down of cells and tissues, which is obtained by the individual organism from the food prepared by the autotrophs, called producers.
    38 (a)
    Name and define the process by which green plants prepare food.
    38 (b)
    Write chemical equation involved in the above process.
    38 (c) (i)
    State in proper sequence the events that occur in synthesis of food by desert plants.
    38 (c) (ii)
    Explain giving reasons what happens to the rate at which the green plants will prepare food (I) during cloudy weather, and (II) when stomata get blocked due to dust.

  3. Question 3

    Light — Reflection and Refraction. Asked once: 2026 (same type asked 3 times)

    33
    The given figure shows image formation by a lens. Analyse the figure and answer the following questions : (a) What is the type of lens used for image formation in the given ray diagram ? (b) If the real image is formed at a distance of 30 cm from the lens and the size of image is twice the size of the object, then where was the object placed ?

  4. Question 4

    Light — Reflection and Refraction. Asked once: 2024 (same type asked 3 times)

    25
    “The linear magnification produced by a spherical mirror is +3+3.” Based on this statement answer the following questions : (a) What is the type of mirror ? (b) Where is the object located ? (c) List two properties of the image formed (other than the size/magnification).

  5. Question 5

    Light — Reflection and Refraction. Asked once: 2026 (same type asked 3 times)

    36
    (a) A ray of light after reflection from a concave mirror becomes parallel to its principal axis. Draw a labelled ray diagram to show this. (b) (i) Differentiate between the virtual images formed by a convex mirror and concave mirror. (ii) “The value of magnification ‘m’ for a mirror is −2-2.” Calculate the height of object if the height of image is 20 cm.