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ICSE Class IX Prelims 2026 : Physics

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Sharath School
Sharath Memorial ICSE School, Ramanagaram

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SHARATH MEMORIAL SCHOOL Near Kempegowda Circle, Ramanagara. IX ICSE ANNUAL EXAMINATION, FEBRUARY-2026. PHYSICS Maximum Marks: 80 Time Allowed: Two Hours Answer to this paper must be written on the paper provided separately. You will not be allowed to write during first 15 minutes. This time is to be spent in reading the question paper. The time given at the head of this paper is the time allowed for writing the answers. Section A is compulsory. Attempt any four questions from Section B. The intended marks for questions or parts of questions are given in brackets []. SECTION A (40 Marks) (Attempt all questions from this Section) Question 1 Choose the correct answer to the questions from the given option (Do not copy the question): [15] i. Clockwise moment produced by a force about a fulcrum is considered to be: A. Positive C. Zero B. Negative D. None of the above ii. If the lens is placed in water instead of air, how does its focal length change? A. Increases C. Decreases B. Remains same D. None of the above iii. A ray of light incident normally on a glass slab emerges: A. deviated C. undeviated B. laterally shifted D. dispersed iv. The focal length of a convex lens is 10 cm. An object is placed at 20 cm. The image is formed at: A. 5 cm C. 20 cm B. 10 cm D. 20 cm on the other side v. Which radiation is used for sterilizing medical instruments? A. Infrared C. X-rays B. Ultraviolet D. Radio waves vi. A nuclear reaction in which a heavier nucleus splits into two lighter nuclei is called: A. Fusion C. Transmutation B. Fission D. Radioactive decay vii. The S.I. unit of specific latent heat of fusion is: A. J/kg B. J/kg K C. J/mol D. J/mol K viii. Total internal reflection occurs when light travels from: A. rarer to denser medium C. air to vacuum B. denser to rarer medium D. glass to diamond ix. Which type of lens is used to correct hypermetropia? A. Concave C. Cylindrical B. Convex D. Plano-concave x. 200 of ice at 0 needs________heat to melt. [Take:Specific latent of ice= 336000 1 ] A. 6720 B. 67200 C. 672000 xi. Temperature v/s time graph of a substance is given below: xii. xiii. xiv. xv. D. 67.2 Which of the following curve represents cooling? A. OA C. AB B. BC D. None of these The relation between C. G. S. and S. I. unit of moment of force is: A. 1 = 105 C. 1 = 105 B. 1 = 107 D. 1 = 105 Which colour deviates least in a prism? A. Red B. Blue C. Green D. Violet A convex lens forms a virtual, erect, magnified image when object is placed: A. at 2F C. at F B. between F and 2F D. between F and optical centre In a nuclear reaction, the sum of mass numbers and atomic numbers of reactants and products are: A. equal B. unequal C. doubled D. halved Question 2 (i) An alpha and a beta particles are exposed to magnetic field on the very thin plane sheet through which the both alpha and beta can penentrate. Magnetic field is directed from your left to right. Name the particle, (a) Going inside the plane (b) Coming out from the plane (c) Goes without any deviation (ii) Match the Column A with Column B. Column A Column B (a) Acclerated motion Uniform rotatory motion (b) Unacclerated motion Uniform circular motion Uniform linear motion (iii) Why do stars twinkle? (iv) The image formed by a convex lens is real, inverted and of the same size as the object. If the distance between the objects and the image is 60 cm, determine the focal length of the lens. Give justification for your answer. (v) Is electric heater a source of ultraviolet radiations? (vi) Complete the following by choosing the correct answers from the bracket: (a) In the spectrum of white light by a prism, the colour at the extreme end opposite to the base of prism is_______.[ blue/ yellow /red] (b) The unit of radioactivity is__________[joule/becquerel/roentgen] [3] [2] [2] [2] [1] (c) A pond appears shallow due to_________[Refraction/ Total internal reflection/ Reflection] (d) Looming in the polar region is due to_________[Refraction/ Total internal reflection/ Scattering] (e) The lens used in magnifing glass is _________[Concave/Convex/ combination both concave and convex] [5] Question 3 (i) (a) Name the electromagnetic waves whose spectrum is obtained by rock salt. Mention the range of its wavelength. (b) Mention any two ways to detect electromagnetic waves stated in (i)(a). (ii) Give any four properties in common to all electromagnetic waves. (iii) A calorimeter of mass 50 g contains 100 g of water at 25 C. 50 g of a solid at 100 C is placed in it. The final temperature is 30 C. Calculate the specific heat capacity of the solid. (specific heat capacity of water = 4.2 J g K ). (iv) State any two factors on which the heat energy absorbed to increase the temperature of the body depends. (v) Snow on the mountain doesnot melt all at once. Why? [2] [2] [2] [2] [2] SECTION - B (40 MARKS) (Attempt any four questions from this section.) Question 4 (i) (a) What is meant by critical angle? (b) State and explain the factors on which critical angle depends.. [3] (ii) (a) A postage stamp appears raised by 10 mm, when placed under the thick glass block of refractive index 1.45. What is the thickness of the glass block? (b) Define shift. [3] (iii) You are required to make a water bath of 40 kg at 40 by mixing hot water at 100 and cold water at 15 . Calculate the ratio of hot and cold water, which should be mixed. Also find the mas of hot water and cold water. [4] Question 5 (i) (a) Define the term absolute refractive index of a medium. (b) Refractive indices of glass, water and carbon disulphide are 1.50, 1.33 and 1.62 respectively. In which one of these media is the speed of light (1) highest and (2) lowest? (c) The absolute refractive indices of glass and water are 3/2 and 4/3 respectively. If the speed of light in water is 2.25 108 1 find the speed of light in (1) vacuum, and (2) glass. [4] (ii) A diver in water looks obliquely at an object AB in air. (a) Does the object appear taller, shorter or of same size to diver? (b) Show the path of two rays AC and AD starting from the tip of the object as it travels towards the diver in water and hence obtain the image of the object. [3] (iii) A candle flame is placed at a distance of 18 cm from the optical centre of a convex lens. If its image is formed on a screen placed at a distance of 36 cm from the lens, answer the following questions : (a) What is the magnification of the image formed? (b) What is the focal length of the lens? (c) Mention the characteristics of image. [3] Question 6 (i) (a) What is unstable radio isotope? (b) After emission of a nuclear radiation the atomic number of the daughter nucleus is decreased by 2. Identify the nuclear radiation. (c) Write a nuclear reaction indicating the nuclear change mentioned in(b). (d) What is the special name given to the parent and daughter nucleus when the daughter nucleus emits 2 more beta particle. [4] (ii) (a) What is the principle of method of mixture? (b) Name and state the law in which this principle is based. [3] (iii) A monochromatic ray of light is incident on an equilateral prism placed at minimum deviation position with an angle of incidence 45 as shown in the diagram. Copy and complete the diagram. Also, state and explain the factors onnwhich critical anfle depends. [3] Question 7 (i) A lens forms a real image of an object 24 cm away from the lens at 48 cm. (a) Name the lens. (b) Find its focal length. (c) Find the magnification of the image produced. (d) Draw a neat ray diagram to illustarate the above case. (ii) State any three properties each of alpha particle and gamma radiation. (iii) Which of the radioactive radiation/s: (a) Can cause severe genetical disorders? (b) Cannot penentrate through a thin paper? (c) Not deflected by electric field? [4] [3] [3] Question 8 (i) (a) What is a calorimeter? (b) Name the material of which a calorimeter is generally made. (c) A calorimeter of mass 25.5 g has aspecific heat capacity of 0.42 J g K . calculate [4] the heat capacity. (ii) (a) Differentiate between nuclear fission and nuclear fusion. (b) State one safety precaution in the disposal of nuclear waste. (iii) Certain lens is used to obtain the virtual and diminished image(image is not on focus). (a) Name the lens. (b) Draw a neat three ray diagram. [3] [3] Question 9 (i) Diagram alongside shows an object AB place in front of lens, when image A1B1 is formed on the same side of the lens. Answer the following questions: a) What is the nature of the lens? b) Show the position of lens in the by rewriting the diagram. c) Complete the diagram, showing two rays originating from the tip of the object. (ii) Rewrite and complete the following nuclear reactions: (a) + 10 (b) 238 92 (c) (iii) 234 90 [4] + _______ + . 172 + _____ + _____ + _____ 69 Write the center of gravity of; (a) Rectangular lamina (b) Triangular lamina (c) Ring [3] [3]

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