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ICSE Class IX Board Exam 2020 : Physics

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The First Steps Pre-Annual Examination- 2020 Class IX Physics Time: 2 hrs Total Marks: 80 General Instructions: 1. Answers to this paper must be written on the paper provided separately. 2. You will not be allowed to write during the first 15 minutes. This time is to be spent in reading the question paper. 3. The time given at the head of the paper is the time allotted for writing the answers. 4. Attempt all questions from Section I and any four questions from Section II. 5. The intended marks of questions or parts of questions are given in brackets [ ]. SECTION I (40 Marks) Attempt all Questions from this Section Question 1 (a) Define light year and astronomical unit. [2] (b) Draw symbols and state functions of the following components in an electric circuit: i. Ammeter ii. Voltmeter iii. Rheostat [2] (c) A block of mass 7 kg and volume 0.07 m 3 floats in a liquid of density 140 kg m -3. Calculate the volume of the block above the surface of the liquid. [2] (d) A person moves 10 m towards the east and then 10 m towards the north. What is the displacement? [2] (e) What is sound? How is it produced? [2] Question 2 (a) Define the term amplitude of a wave. Write its SI unit. [2] (b) The rate of change of momentum of a body is 3 kg ms-2. What is the force acting on the body? [2] (c) Differentiate between the two types of cell. [2] (d) You are given a body of mass 12 kg. Calculate the: i. force exerted by the Earth on the body and ii. force exerted by the body on the Earth. Take g = 10 N/kg. [2] (e) How will you forecast the gradual and sudden rise in the atmospheric pressure with the help of a barometer? [2] Question 3 (a) What do you mean by greenhouse effect? [2] (b) What is anomalous expansion of water ? [2] (c) Why is copper used for manufacturing of wires which are used for electrical purposes? [2] (d) Which type of mirror is preferred in automobiles to observe traffic at the back? [2] (e) In case of a convex mirror, if the object is moved away from the mirror surface, how does the position of the image change? [2] Question 4 (a) Mention the essential conditions required for sound waves to travel in a medium. [2] (b) Why we cannot hear the explosions that take place on other planets on the Earth? [2] (c) A source of wave produces 40 crests and 40 troughs in 0.4s. What is the frequency of [2] the wave? (d) What do you mean by reflection of light? Write laws of reflection. [2] (e) Does magnetic field lines ever intersect? Give reason. [2] SECTION II (40 Marks) Attempt any four Questions from this Section Question 5 (a) State four characteristics of image formed by plane mirror. (b) An insect is sitting in front of plane mirror at a distance of 1m from it; i) Where is the image of the insect formed. ii)What is the distance between insect and image? (c) Differentiate between real and virtual image. [3] [3] Question 6 (a) A ball released from height and it reaches the ground in 3s. if g=9.8 ms-2, find, i. height from which the ball was released ii. velocity with which the ball will strike the ground [3] (b) Distinguish between mass and weight. [4] [3] (c)A ball is thrown vertically upwards. It goes to a height 20m and then returns to the [4] ground. Taking acceleration due to gravity g to be 10m/s2, find: (i) The initial velocity of the ball (ii) The final velocity of the ball on reaching the ground and (iii) The total time of journey of the ball. Question 7 (a) The graph shows the velocity-time graph for two bodies X and Y moving in the same direction. Name the body which has greater acceleration. Why? [3] (b) Show that the rate of change of momentum = mass x acceleration. Under what condition does this relation hold? [3] (c) Define inertia and its types. [4] Question 8 (a) A car is moving with a uniform velocity of 30m/s. It is stopped in 2s by applying a force of 1500N through its brakes. Calculate: (i) the change in momentum of car, [3] (ii) theretardation produced in car, and (iii) the mass of the car. (b) "Aquatic animals can survive below the surface of frozen rivers". Explain. [3] (c) Draw suitable diagrams to illustrate the action of i) concave ii) convex mirror on a beam of light incident parallel to principal axis. [4] Question 9 (a) Draw graphs to show the dependence of (i) acceleration on force for a constant mass, and (ii) force on mass for a constant acceleration. [3] (b) An object of height 2 cm is placed at a distance of 20 cm in front of a concave mirror focal length 12 cm. Find the position, size, nature of the image. [3] (c) i. Figure shows the velocity-time graph of a particle of mass 100 g moving in a straight line. Calculate the force acting on the particle. ii. Ratio of the wavelengths of two sound waves in air is 3:5. Find the ratio of their frequencies. [4] Question 10 (a) Figure shows the displacement of a body at different times. [3] (1) Calculate the velocity of the body as it moves for time interval (i) 0 to 5s, (ii) 5s to 7s and (iii) 7s to 9s. (2) Calculate the average velocity during the time interval 5s to 9s. (b) Derive the following equations for a uniformly accelerated motion: (i) v = u + at (ii) S = ut + at2 where the symbols have their usual meanings. [4] (c) A body starts with an initial velocity of 10m/s and acceleration 5m/s2. Find the distance covered by it in 5s. [3] ********************************************

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