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ICSE Prelims 2015 : PHYSICS ( North Point School )

6 pages, 64 questions, 6 questions with responses, 6 total responses,

Yash
North Point School, Koparkhairane, Navi Mumbai

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boatman 100 m away and by a diver 100 rn below from the place of explosion.Who would hear the sound first and why? ( {2) d)rA child hears an echo from a clitf 4 s after the sound from a powerful cracker is produced.How far away is the cliff frorn the child? (speed of sound in air is 330 ms-1) {2) efGnuethe S.l.unitof (2) ffirequency (ii) loudness section-ll (n MARKS) (Attempt any four questions from this section) QUESTION:5 a) A load of 18 kgf is lifted by applying an effort of 100 N in upward direction by using a single pulley. (if Draw the diagram of the given pulley system. (f) What is the MA of this system? (6 wnat is its vR? 1ifl Calculate the efficiency of the given machine. 6 Jack and Jillwent up a hill. Jack is twice as massive as Jill. Yet Jill climbed the same distance in half the tlme.Who did more work?Who delivered more power and why? (4) (3) c)Show that the tota! mechanical energy of a freely falling body remains constant.(3) QUESTION:6 a) The diagram shows a point source of light S,a convex lens L and a plane mirror M.The three are placed such that rays of light from S retum to it after refraction and reflection frorn mirror M. .T L .M (i) Copy the diagram and draw the reflected and refracted rays starting from S. (ii) What is the distance OS called? (iii)Write two characteristics of the image formed. (4) b)Draw a ray diagrarn to show the principle used in the foilowing: (i) A lens as a combination of prisnrs. (ii) $lide projector or film projector. (3i c) The following tah,le represents a part of the electromagnetic spectrum in increasing order of frequency. VISIBLE LIGHT I D G (i) Name the radiations C and D' (ii) How are the radiations G and D detected? (3) Gfesrlou,r . ;ii,il;*ih" of alpha, beta and gamma lays' "o*position i,nWnicn of them travel with the speed of light in air? (irf now do alpha, beta and gamma behave in an electric field? b) Draw a neat labeled diagram of the Hot Cathode Ray Tube. of low work function are preffered as thermionic emitters.why? c).O ' 6ti-1Materials good thermionic emitter. ttame a iifr) convert i eV to joule. (4) (3) (3) QUESTION:8 {;^Water has a very high specific heat capacity' (i)G.rve its value in Jg-'K' (2) for aquatic plants. (4) ii'DfxpUin how this firoperty is useful (1) in car radiators p) The given graph represents the cooling curve of a substance: ? Ol.Wnrt islhe boiting point and freezing point of the substance (i6 Wnat happens inBC and DE? [iDWnV is the region DE shorter than BC? " temo I (3) I I 10 15 time 20 25 30 35 > are c) .A beaker contains 100 g of water at 200 C. The beaker and its contents heated till 50 g of water is boiled off'Calculate : (i)the heat required to raise the temperature of water to 1000C. heat (iD'tfre amount of heat rgquired in the above experiment,if specific latent Of stearn is 2260 Jg-1. (neglect heat absorbed by beaker) (3) 7 / QUESTION:9 ai Two waves Xand Yale propagated in the same rnedium.!f frequency of yis 6660 S.l units ,study the following figure and find: (i) Velocity of each wave. (ii) frequency of X (iii) which wave would produce high pitch? (iv) Which wave produces greater toudness? (4) b rn r tnat u *.n y'| C*) D;sta'n.e. Ccrs) blA stone is dropped into a well 44.L m deep.The sound of splash is heard 3.13 seconds after the stone is dropped.Find the velocity of sound in air. (take g=9.8 ms-2) {3} c)The diagram shows three pendulums A,B,c suspended by a horizontal string PQ.What is your observation if pendulum A is set into vibration. Name and explain your (3) observation. 20og 50g 1009 qUESTIOt{:!CI alThe following circuit shows 4 cells of 1.5 V each with each having an lnternaL resistance of 0.25 O.Calcuiate: (i)current through 5O resistor. (i ilcu rrent th rough 4Oresistor IA\ {iii}the potential drop acrcss the ternrinals V =-Lr( "7=17:v b)A bulb is marked 100 W 22OV and an electric heater is marked 2000 W 200 v. (i) What is the ratio of their resistances? (ii) How does the power - voltage rating of the device help us to decide the Connecting wires? (3) (iii) ln which device is a thicker wire needed? c) Draw a diagram of the dual switch used in staircase lighting. I I I ii ') I I I I t ,F-, It ll .) i iI tf ii l; ] (3)

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