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ICSE Class X Prelims 2021 : Physics (Garden High School, Kolkata)

7 pages, 61 questions, 24 questions with responses, 24 total responses,

Priyam Panda
Garden High School, Kolkata
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PRELIMS, 2020 21 CLASS: X SUBJECT: PHYSICS PAPER NAME: FULL MARKS: 80 10-SCIENCE PAPER 1-PRELIMS PRELIMS STARTS: PRELIMS ENDS: 21 DECEMBER 2020, 09:00 AM 21 DECEMBER 2020, 12:00 NOON Section-specific Email ids for sending answers of this PRELIMS: 10A gardenhigh10a@gmail.com 10B gardenhigh10b@gmail.com 10C gardenhigh10c@gmail.com 10D gardenhigh10d@gmail.com 10E gardenhigh10e@gmail.com INSTRUCTIONS 1. The first page is the Instruction page. The set of questions starts from page 2. 2. The total duration of the Prelims includes 15 minutes reading time and 45 minutes emailing time. 3. Write your Full Name, Class, Section, Student Id, Paper Name, Date and Page Number on the top of each page of your answer script. 4. Name the answer file following the naming convention: <Class-Sec>-<Student Name><Subject>-<Date>.pdf 5. The single pdf file should be emailed to the email id corresponding to your ClassSection. The Email must have: <Class-Sec>-<Student Name>-<Subject>-<Date> in the Subject Line. The set of questions start from the next page Page 1 of 7 CLASS X Prelims, 2020 21 Physics Science Paper 1 Time: 2 hours Full Marks: 80 This Question Paper has six pages. You should not write for the first 15 minutes. This time must be spent in reading the Question Paper. The time given at the head of this Paper is the time allowed for writing answers. This Paper is divided into two sections. Answer all the questions of Section A and any four of Section B. Maximum marks for a question or parts of a question are given in brackets [ ]. SECTION A Answer all the questions. Question No. 1 (a) (b) Where does the position of the centre of gravity lie for: (i) a circular lamina? (ii) a triangular lamina? [2] Draw a graph to show the variation of kinetic energy with the distance covered by a body when the body is thrown vertically up. (c) (d) Name a machine which can be used: (i) to multiply force. (ii) to change the direction of force applied. [2] A ball of mass 200g falls from a height of 5m. What will be its kinetic energy when it just reaches the ground? Take g = 9.8 ms 2. (e) [2] (i) [2] Which of the following remains constant in uniform circular motion: speed or velocity or both? (ii) Name the force required for uniform circular motion to take place. Page 2 of 7 [2] Question No. 2 (a) Define echo. Mention any one practical use of it. (b) Two bulbs are marked 110W, 220V and 55W, 110V, respectively. Calculate (c) [2] the ratio of their resistances. [2] Arrange the following radiations in descending order of frequency: [2] UV rays, gamma rays, microwaves, infrared rays (d) Can a normal convex lens behave like a concave lens? Justify your answer. [2] (e) Mention two factors on which the deviation of light through a prism depends. [2] Question No. 3 (a) Write two differences between infrared radiations and sound waves. (b) Calculate the minimum distance required between an observer and a large object for an echo to be heard. Consider the speed of light in air as 330 ms 1. (c) [2] The heat released by a copper ball of mass 1 kg when cooled from 100 C to 90 C is 8.4 kJ. Calculate the specific heat capacity of copper. (e) [2] Why is the third pin in a three pin plug longer and thicker than the other two pins? (d) [2] [2] Draw a ray diagram to show the refraction of light through a rectangular glass block. Mark the lateral displacement in your diagram. [2] Question No. 4 (a) A body of mass M has velocity V. The mass of the body is increased 81 times, but the kinetic energy remains the same. Calculate the new velocity. [2] (b) State the conditions required for total internal reflection to take place. [2] (c) Give two differences between terminal potential difference and the emf of a cell. [2] (d) State Ohm s law. Mention one limitation of the law. [2] (e) State the transformation of energy that takes place when the following are in use: (i) a loudspeaker (ii) an electric cell [2] Page 3 of 7 SECTION B (40 marks) Answer any four questions. Question No. 5 (a) In a waterfall, the water falls from a height of 50m. Calculate the rise in temperature of the water when it strikes the base of the waterfall. Take g = 10 ms 2 and the specific heat of water as 4200 Jkg 1 C 1. (b) Define momentum. Two bodies, A and B, have the same momentum but A is heavier than B. Which body will have more energy? Explain your answer. (c) [3] (i) Define specific resistance and write its SI unit. (ii) State the factors on which the resistivity of a material depend. [3] [4] Question No. 6 (a) A radar is able to detect the reflected waves from an aeroplane, after a time interval of 0.02 milliseconds. Calculate the distance of the plane from the radar. (b) [3] A piece of ice is heated at a constant rate. The variation of temperature with heat input is shown in the graph below: (c) (i) What are represented by AB and CD? (ii) Why is the length of CD larger than the length of AB? [3] 50g of water at 0 C is added to 300g of a liquid at 30 C. What will be the final temperature of the mixture? The specific heat capacity of the liquid is 2.65 Jg 1 C 1, while that of water is 4.2 Jg 1 C 1. [4] Page 4 of 7 Question No. 7 (a) The diagram given below illustrates the experimental setup for the determination of the focal length of a convex lens using a plane mirror. Study the diagram and answer the questions that follow: (i) State the magnification of the image formed. (ii) Write one characteristic of the image formed. (iii) What is the name given to the distance between the object and the optical centre of the lens? (b) (i) [3] A glass is placed over a page on which the word VIBGYOR is printed with each letter in its corresponding colour. (A) Will the images of all the letters appear to be in the same positions? (B) If not, state which letter will be raised to the maximum. Give a reason for your answer. (c) (ii) How will you detect the presence of ultraviolet radiations? [3] (i) What is meant by refraction? (ii) If an oblique ray of light passes from medium 1 to medium 2 without any change of direction, what can be said about the refractive index of each of these media? (iii) Express the refractive index of a medium in terms of: (A) velocity of light (B) the angle of incidence in air and the angle of refraction in a denser medium. [4] Question No. 8 (a) An electrical appliance is rated 1500W, 250V. The appliance is connected to 250V mains. Calculate: (i) the current drawn. (ii) the electrical energy consumed in 60 hours. (iii) the cost of electrical energy consumed at 2.50 per kWh. Page 5 of 7 [3] (b) In the figure given below A, B and C are three ammeters. The ammeter B reads 0.5 A. Calculate: (c) (i) the reading in the ammeters A and C. (ii) the total resistance of the circuit. [3] Draw a ray diagram to show the bending of a stick partly and obliquely immersed in water. [4] Question No. 9 (a) (i) Define specific heat capacity. (ii) Which material is a calorimeter made up of? Give one reason for using this material. (b) [3] An object is placed in front of a lens between its optical centre and the focus. It forms a virtual, erect and diminished image. (c) (i) Name the type of lens used. (ii) Draw a ray diagram to show the formation of the image. (i) What is the principle on which SONAR is based? (ii) An observer stands at a certain distance away from a cliff and produces a [3] loud sound. He hears the echo of the sound after 1.8s. Calculate the distance between the cliff and the observer if the velocity of sound in air is 340 ms 1. [4] Question No. 10 (a) (i) What is meant by radioactivity? (ii) Define background radiation. (iii) Mention one difference between alpha and beta particles. Page 6 of 7 [3] (b) (i) An equal quantity of heat is supplied to two substances A and B. A shows a greater rise in temperature than B. What can you say about the heat capacity of A as compared to that of B? (ii) What energy change would you expect to take place in the molecules of a substance when it undergoes: (c) (A) a change in temperature? (B) a change in its state without any change in its temperature? [3] Draw a labelled diagram of a block and tackle system consisting of 5 pulleys. [4] Page 7 of 7

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