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ICSE Class X Question Bank 2024 : Physics

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PHYSICS UNIT 1-LIGHT PRACTICE QUESTIONS (15) 1.When two lenses 10D and - 20D are kept in contact find focal length. a)- 9 cm b)- 10 cm c)- 11 cm d)- 12 cm 2.Assertion (A) : Light travels faster in glass than in air. Reason (R) : Glass is denser than air. a) Both A and R true and R is the correct explanation of A. b) Both A and R are true but R is not the correct explanation of A. c)A is true but R is false. d) A is false but R is true. 3.In order to obtain a magnification of ( 3) with a convex lens, object should be placed : a) Between optic centre and focus b) Between focus and 2F c) At 2F d)Beyond 2F 4. The refractive indices of four substances P, Q, R and S are 1.77, 1.50, 2.42 and 1.31 respectively. When light travelling in air is incident on these substances at angles, the angle of refraction will be the maximum in : a)P b)Q c)R c) S 5) In the diagram shown below: a) B is incident ray and C is refracted ray. b) A is incident ray and B is refracted ray. c) C is incident ray and B is refracted ray refracted ray. d) A is incident ray and C is 6) From the diagram shown below, identify the characteristics of the image that will be formed. a). Real. b) Diminished. C)Formed within the focal length. d)Virtual 7) The diagram below shows an image formed at a distance 36 cm from the lens LL of focal length 12 cm. With respect to this answer the questions that follow. \ (i) The position of the object on the left-hand side should be a) between 12 cm to 30 cm from the lens. b) beyond 24 cm from the lens. c)between 12 cm to 24 cm from the lens. d) within 12 cm from the lens. (ii) Power of this lens is a) - 8.33 D b) + 8.4 D c) + 8.33 D d) 8.4 D (iii) The object distance with sign convention is a) - 18 cm b) - 15 cm c) - 9 cm d) + 18 cm 8) Assuming all lenses shown below are of the same material, state which lens has the maximum power a) P b) Q c)R d)S 9)The diagram shows the path of light through a right-angled prism of critical angle 42 . Observe the diagram and answer the questions that follow. (i) The phenomenon at the surface AC is a) Refraction b) Partial reflection c) Total internal reflection d) Scattering. (ii) The angle of incidence at the surface AC is a)30 b)45 c) 0 d) 60 9.(iii)Which of the following statement is wrong? a) Speed of light ray PQ is equal to the speed of light ray ST. b) Speed of light ray QR is equal to the speed of light ray RS. c) Speed of light ray PQ is greater than the speed of light ray RS. d) Speed of light ray RQ is greater than the speed of light ray ST. 10) Rajan takes the following two photographs of the text in a book, first while keeping a circular piece of glass on the book and then while holding it at some distance above the book Which of the following statements is true about the piece of glass? a) It is a convex lens as the text is not inverted. b)It is a concave lens as the text is diminished in size. c) It is a plane glass disc as there is no difference in the text. d) It cannot be predicted based on the given information 11. Assertion (A): Refractive index has no units. Reason (R): The refractive index is the ratio of two similar quantities. a) Both A and R are true and R is the correct explanation of A b)Both A and R are true and R is not the correct explanation of A. c) A is true but R is false. d) A is false but R is true. Answer the Following( Question:1 Question:2

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