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ICSE Class IX Board Exam 2020 : Physics

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CLASS IX ANNUAL EXAMINATION PHYSICS SCIENCE PAPER 1 SECTION - A QUESTION 1 (a) Give the SI unit of the following: [2] (i) Temperature (ii) Potential difference (b) (i) what is a simple pendulum? [1] (ii) Write an expression for the time period of a simple pendulum. [1] (c) (i) what will be the distance covered by the body if it moves on a circular path and reaches its original position after one complete round? [1] (ii) a boy while running throws a basketball high up in the air, runs and catches it. which has more displacement, the boy or the ball? [1] (d) (i) two straight lines are drawn on the same displacement time graph. Line A making an angle of 300 with the time axis and line B making an angle of 600 with the time axis. Which of the following represents greater velocity? [1] (ii) how will you calculate the displacement from a velocity time graph? [1] (e) A scooter moving at a velocity of 5m/s picks up a velocity of 35 m/s in 5 seconds. Calculate the average acceleration. [2] QUESTION 2 (a) Choose the odd one out and give a reason for your choice [2] Tension, electrostatic force, magnetic force, gravitational force (b) (i) why does the electric fan rotate for some more time after the current is switched off? [1] (ii) what brings it to stop after some time? [1] (c) (i) what is the relation between newton and dyne? [1] (ii) if you drop a rubber ball on the floor, it bounces back. Identify the force which causes the bounce. [1] (d) Which of the following force diagrams on (i) or (ii) can depict an object undergoing uniform motion? Give a reason for your answer. [2] 20N 20N 5N 25N (i) (ii) (e) A man weighs 880N at the equator [2] -2 (i) Calculate his mass. (g= 10ms ) (ii) How will his weight change if taken to the poles? QUESTION 3

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