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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 (a) Calculate the pressure exerted by 6 cm of water on its base in SI unit. Density of water is 1000kgm3. [2] (b) (i) state the law of floatation [1] (ii) Why the pressure of the atmosphere does not break windows? [1] (c) If d1, d2 and d3 are the densities of liquid 1, liquid 2 and solid 3 respectively, compare: (i) The densities of d1 and d2 (ii) The densities of d2 and d3 d1 d3 d2 (d) A deep pod of water has its top layer frozen during winter. What will be the likely temperature of the water level? [2] (i) Just in contact with ice (ii) At the bottom of the pond? (e) (i) what is the energy transformation in a nuclear power plant? [1] (ii) What is the ultimate source of energy for the earth? [1] QUESTION 4 (a) (i) how should the two plane mirrors be arranged to get an infinite number of images? [1] (ii) Where should an object be placed in front of a concave mirror to obtain an image of the same size as that of the object? [1] (b) (i) which spherical mirror will you choose if you want to see the enlarged image of your face? [1] (ii) What will be the position of your face to obtain the enlarged image? [1] (c) A source produces 20 compressions and rarefactions in 0.4s. (i) Calculate the frequency [1] (ii) Will you be able to hear the sound? {1] (d) State two conditions for the flow of electric current in the circuit. [2] (e) Define magnetic induction. [2] SECTION - B QUESTION 5 (a) (i) Which of the following instruments is the most precise instrument for measuring length [1] 1. A Vernier calipers of least count 0.01 cm 2. A screw gauge of pitch 1 mm and 100 divisions on a circular scale. (ii) When is screw gauge said to be free from zero error? [1] (iii) Give one way to decrease the least count of a screw gauge. [1] (b) (i) What is a seconds pendulum? [1] (ii) State the effective length of seconds pendulum at a place where g is 9.8ms-2. [1] (iii) A boy is swinging on a swing. If another boy sits along with him without disturbing the motion, how will the time period change? [1] (c) From the velocity time graph given below, calculate: (i) Acceleration along AB (ii) Acceleration along BD (iii) Total distance travelled B C D 40 VEL (m/s) A 0 2 4 6 E 8 TIME QUESTION 6 (a) (i) what is the relationship between the force applied on a body and rate of change of momentum? [1] (ii) is momentum a scalar or vector quantity? [1] (iii) Draw a displacement time graph for an object moving with uniform velocity. [1] (b) (i) two bodies A and B are kept in contact, A is at 520C and B is at 610C. state the direction of heat flow. [1] (ii) what do you understand by anomalous expansion of water [1] (iii) name the radiation that is absorbed by greenhouse gases. {1] (c) (i) define 1 newton [4] (ii) a force of 0.4N acts on a mass of 4 kg at rest. Calculate its velocity and momentum at the end of 10s. QUESTION 7 (a) (i) If you swim beneath the surface in salt water, will the pressure be greater than in fresh water at the same depth? Give a reason for your answer. [2] (ii) Which physical quantity is expressed in the unit atm ? [1] (b) (i) An object is weighed using a spring balance in air and in vacuum. In which medium will the weight of the object be more? [1] (ii) 500 ml of water is poured into each of these vessels A,B and C. explain, with reason, in which vessel will be the pressure at the bottom of the container be the least. [2] A B C (c) A body of mass 3.5 kg displaces 1000cm3 of water when fully immersed it. density of water is 1gcm-3. [4] Calculate: (i) The volume of the body (ii) The up thrust of the body (iii) The weight of the body inside water QUESTION 8 (a) (i) what will be the image of the word PIE if you see it in a plane mirror kept vertical on the line AB. (no ray diagram required) [1] A B (ii) When does a ray of light falling on a plane mirror completely retraces its path? [1] (iii) A boy stands 4 m away from a plane mirror. What is the distance between the boy and the image? [1] (b) A convex mirror forms the image of an object placed at a distance of 30 cm. in front of the mirror at a distance of 10 cm. find the focal length of the mirror. [3] (c) (i) draw a ray diagram and get the image formed by a concave mirror when an object is kept beyond the centre of curvature at a finite distance. [3] (ii) state any one characteristic of the image formed in (i) [1] QUESTION 9 (a) A sound wave is emitted by a vibrator has a frequency of 40000Hz. [3] (i) Name the type of wave (ii) Give one medical use of the wave mentioned in (i) (iii) Two aeroplanes A and B are moving at speeds 250 m/s and 350 m/s respectively. Give a special name to the speed of the aeroplane B. (b) (i) sound travels slower on a cold winter night. Give a reason. [3] (ii) define amplitude of a wave. (iii) How does the speed of sound change with the change with the amplitude? (c) A wave has amplitude equal to 8 cm and the wavelength is 2 m. the frequency of the wave is 150 Hz. [4] (i) Draw the graph of the wave representing displacement and time. (ii) Calculate its velocity. QUESTION - 10 (a) (i) state two differences between a primary and a secondary cell. [3] (ii) two conductors A and B are joined by a copper wire. A is positively charged and B is negatively charged. State the direction of the conventional current. (b) (i) calculate the potential difference if the work done in moving 3C charge between two points is 18J. [3] (ii) draw the circuit symbols for a cell and a rheostat. (c) (i) suggest any two ways to increase the strength of an electromagnet. [4] (ii) draw the magnetic field lines around a bar magnet when the north pole of the bar magnet is placed facing the geographic south pole of the earth along the magnetic axis of the earth. (iii) Indicate the position of neutral points by marking X.

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