PYQ Vault

Day 214: CBSE Class 10 Science

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

  1. Question 1

    The Human Eye and the Colourful World. Asked once: 2024 (same type asked 4 times)

    31
    Name and explain the phenomenon of light due to which the path of a beam of light becomes visible when it enters a smoke filled room through a small hole. Also state the dependence of colour of the light we receive on the size of the particle of the medium through which the beam of light passes.

  2. Question 2

    The Human Eye and the Colourful World. Asked once: 2024 (same type asked 4 times)

    13
    The lens system of human eye forms an image on a light sensitive screen, which is called as :

    Tap an option to check your answer.

  3. Question 3

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

    10
    Which pair of sex chromosome will determine a male ?

    Tap an option to check your answer.

  4. Question 4

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

    23 (a)
    Name the type of blood (oxygenated / deoxygenated) transported by each of the following mentioning the path (i.e. from one organ (which place) to another (which place)). (i) Vena cava (ii) Pulmonary artery

  5. Question 5 (case study, 4 parts)

    Light — Reflection and Refraction. Asked once: 2023 (same type asked 3 times)

    Many optical instruments consist of a number of lenses. They are combined to increase the magnification and sharpness of the image. The net power (P) of the lenses placed in contact is given by the algebraic sum of the powers of the individual lenses P1,P2,P3…\mathrm{P_1, P_2, P_3 \ldots} as P=P1+P2+P3…\mathrm{P = P_1 + P_2 + P_3 \ldots} This is also termed as the simple additive property of the power of lens, widely used to design lens systems of cameras, microscopes and telescopes. These lens systems can have a combination of convex lenses and also concave lenses.
    39 (a)
    What is the nature (convergent / divergent) of the combination of a convex lens of power +4+4 D and a concave lens of power −2-2 D ?
    39 (b)
    Calculate the focal length of a lens of power −2⋅5-2{\cdot}5 D.
    39 (c)
    Draw a ray diagram to show the nature and position of an image formed by a convex lens of power +0⋅1+0{\cdot}1 D, when an object is placed at a distance of 20 cm from its optical centre.
    39 (c) OR
    How is a virtual image formed by a convex lens different from that formed by a concave lens ? Under what conditions do a convex and a concave lens form virtual images ?