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ICSE Class X Mid-term 2021 : Physics : Summative (Ryan International School)

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Melvin
Ryan International School (RIS), Kundalahalli, Bangalore

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RICSE II ASSESSMENT(Summative)- 2020-21 SUBJECT: PHYSICS CLASS: X ICSE Maximum Marks: 40 Section A [40 M] IAnswer all 5x 1-5 1. State whether the resistivity of a wire changes with the change in the thickness of the wire and why? (Electricity) 2 State two ways of increasing the frequency of vibrations of a stretched string. (Sound) 3.Why the hightension wire should have low resistance and large surface area? (House hold circuits) 4. Write two factors which do not affect the e.m.f of a cell. (Electricity) 5. State the law of resistance in parallel. (Electricity) II Answer all 5x2 10 6. Write two conditions of an echo. (Sound) 7. You have three resistors of values 22, 32 and 52. How will you join them so that the total resistance is less than 127 i) Draw a diagram for the arrangement. (ii) Calculate the total resistance. 8.Identify the following wires used in a household circuit: 1) The wire is also called as the phase wire. (Electricity) (i) The wire is connected to the top terminal of a three pin socket. (House hold circuits) 9.Explain why MCB is more convenient than the fuse? (House hold circuits) 10. Find the equivalent resistance of the following network. 3 ww wM ww- III Answer all 3x3 9 11.()What are damped vibrations? (i) State two differences between Natural and forced vibrations. (Sound) 12.(i) Write two conditions of resonance. (i) When a troop crosses a suspension bridge, the soldicrs are asked to break their steps. Why? ( Sound) 13.) A fuse is rated 8A. Can it be used with an electrical appliance rated 5 KW, 200 V? Give a reason. ii) Name two safety devices which are connected to the live wire of a household electric circuit. (House hold circuits) IV Answer all 4x4-16 14 i) A geyser has a rating 2 kVA, 240 V. (a) What is the electrical energy consumed by it in (i) kWh, and (i) joule if it is used for 90 minutes (b) If the cost of electricity is 4.50 rupees per commercial unit, find the cost? (Electricity) 15.A cell of e.m.f 1.5 V, internal resistance 1 Q is connected to the resistors of 4Q and 20 N in series. Draw a circuit diagram and calculate: () The current in the circuit. (i) The potential difference across each other. (ii) The potential difference across the cel1 (iv) The voltage drop when the current is flowing. (Electricity) 16.A person standing between the two vertical cliffs and 640 m away from the nearest cliff, produces sound. He hears the first echo after 4 s and the second echo 3s later. Calculate: (a) the speed of sound in air, and (b) distance between the cliffs. Sound) 17.(a) Explain why strings of different thickness are provided on a stringed instrument. (b) Draw a sketch showing the displacement against time for a body executing damped vibrations. (Sound)

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