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taDSb b2 vb5q6 PHYSICS -I SCIENCE Paper (Two hours) Answers to this Paper must be written on the poper provided separately. You will not be allowed to This time is to be The time given at the head section I of write during synt in reading The inrended marks for first lS minutes. the Question PaWr. this Paper is the time is compulsory. Anempt any the allowedfor writing the answers. four questionsfrom section'Ir. quesrions or parts of questions are given in brackets I J. SECTION I (40 Marks) Attempt all qaestions from this Section Question (a) (i) (ii) I Give an example of anon contactforcewhich is always of attractive naiure.r t21 How does the magnitude of this non contactforceon the two bodies depend on the distance of separation between them? (b) A boy weighing 40kgf climbs upa stair of 30 steps each Z}cmhigh in 4 minute t2] and a girl weighing 30kgf does *rc same in 3 minutes. Compare:- (i) The work done by them. (ii) The power developed (c) by them. With reference to the terms Mechanical Advantage, Velocity Ratio and efficiency of a machine, name and define the term that will not change for a t21 machine of a given design. (d) Calculate the mass of ice requird to lower the temperature of 3009 of water at 40oC to water at 0oC. (specific latent heat of ice:336 Jlg,Specific heat capacity of water4 .z Jlgtc) This Paper consists of 7 printed pages and T16 521 @ Copyright reserved. 1 blank page. Turn over t21 (e) t2l statements: What do you understand by the following (i) The heat capacity of the body is 60 JK-t' (ii) The specific heat capacity of lead is 130 Jkg-t6-t' Question 2 tzl (a)Staterwofactorsuponwhichtheheatabsorbedbyabodydepends. (b)Aboyusesbluecolouroflighttofirrdtherefractiveindexofglass.Hethen light' will the refractive index be the repeats the experiment using red colotrof 12\ Give a rieason to stlpport your answer' same or different in the two cases? (c) the pdhof light ray till it emerges copy the diagram given below and complae gtass is 42"' tn your diagram mark the out of the prism. The critical angle of 121 angles wherever necessary' (d) State the dependence of angle of deviation: (i) On the refractive index of the (ii) On the wavelength of light' * 121 m*erial of the pri$n' (e)Theratioofamplitudeofwowavesis3:4.whdisdleraiooftheir: (i) t21 loudness? (ii) frequencies? Question 3 (a) State rwo ways by which the string can be increased' T16 521 of @uency of transwrse vibrations a stretched 121 (b) What is meant by noise pollution? Name one source of sound causing noise 12) pollution. (c) The V-l graph for a series combination and for a parallel combination of two resistors is shown in the figure below. Which of the two t2) A or B, represents the parallel combination? Give a reason for your answer. (d) A music s)'stem draws a current of 400 mA w'hen connected to a 12 V hattery. (i) \\'hat is the resistance of the music system? (iit The music system is left playing for several hours and finallv the battery l2l voltage drops and the music system stops playing when the current drops to 320 mA. At what batterl,voltage does the music system stop playing? (e) Calculate the quantity of heat produced in a20 O resistor carrying 2.5A current tzl in 5 minutes. Question 4 (a) State the characteristics required of a good thermion emitter. l2l (b) An element zSA decays to ssR::2 after emitting2 a particles and I B parricle. Find the atomic number and atomic mass of the element (c) .{ radioactive substance is oxidized. l2) S. Will there be anr change in the nature of 121 its radioactil,itl,? Give a reason for your answer. (d) State the characteristics required in a material to be used as an effective tuse i2l wire. (e) Which coil of a step up transfbrmer is made thicker and wh5,? T16 52r 3 t2) Turn 0ver SECTION II (40 Marks) Attempt any four questions from this Section Question 5 (a) A stone of mass 'm' is rotated in a circular path with a uniform speed by tying a 13l questions: strong string with the help of your hand. Answer the following (i)lsthestonemovingwithauniformorvariablespeed? (ii) ls the stone moving with a uniform acceleration? tn *'hich direction does the acceleration act? what kind of force acts on the hand and state is direction? (iii) (b) From the diagram given below, answef the questions that follow: (i) What kind of PulleYs are A and B? (ii) State the PurPose of PulleY B. (iii) what effort has to be applied at c to just raise the load 13l L:}akgfl (Neglect the weight of pulley A and friction)' (c) (i) An effort is applied on the bigger wheel of a gear having 32 teeth' It is used 14l to turn a wheel of 8 teeth. Where is it used? (ii) A pulley system has three pulleys. A load of I20N is overcome by applying an effort of 50N. Calculate the Mechanical Advantage and Efficiency of this sYstem. Question 6 (a) (i) What is the principle of method of mixtures? (ii) What is the other name given to it? (iii) Tt6 521 Name the law on which the principle is based' 13l (b)Someiceisheatedataconstantrate,anditstemperatureisrecordedaftereveryt3] Draw a temperature time graph to few seconds, till steam is formed at 100oC. phase changes in your graph' represent the change. Label the two (c)Acoppervesselofmassl00gcontainsl50gofwaterat50oC.Howmuchicet4] is needed to cool it to 5oC? Given : Specific heat capacity of copper : 0'4 J g-t Specific heat capacity of water = 4'2 ! Specific latent heat of fusion of ice = f'r og-t og't 336 J g-' Question 7 (a)(i)Writearelationshipber*.eenangleofincidenceandangleofrefractionfor t3l a given Pair of media' to another having different when a ray of light enters from one medium (ii) phenomenon occur? optical densities it bends' Why does this (iii)Writeoneconditionwhereitdoesnotbendwhenenteringamediumof different oPtical densitY' t3l (b)Alensproducesavirtualimagebetweentheobjectandthelens. (i) Name the lens' (ii) Draw a ray diagram to show the formation of this image' (c)Whatdoyouunderstandbytheterm.Scatteringoflight'?Whichcolourof t4l white light is scattered the least and why? Question 8 (a) (i) (ii) Name the waves used for echo depth sounding' purpose' Give one reason for their use for the above (iii) (b) (i) (ii) T16 521 t3l to us? Why are the waves mentioned by you not audible What is an echo? t3l place' State two conditions for an echo to take Turn Over (c) (i) (ii) Name the phenomenon involved in tuning a radio set to a particular station. t4l Define the phenomenon named by you in part (i) above. (iiD What do you understand by loudness of sound? (iv) In which units is the loudness of sound measured? Question 9 (a) (i) Which particles are responsible fbr cun€nt in conductors? (ii) t3l To,which wire of a cable in a power circuit should the metal case of a geyser be corinected? (iii) To which wire shouldthe fuse be connected? (b) (i) Name the transformer used in the power transmiuing station of a power t3l plant. (ii) What type of current is transmitted from the power station? (iiD At what voltage is this (c) current available to our household? A battery of emf lZY andintemal resisiance 2 O is connectgd with two resistors A and B of resistance 4 Q and 6 O respectively joined in series. 40 6f) Find: (i) Current in the circuit. (ii) The terminal voltage ofthe cell. (iii) The potential difference auoss 6Q Resistor. (iv) Electrical energy spent per minute in 4O Resistor. T16 521 t4l Question l0 (a) Arrange c, B and T rays in ascending order (i) with respect to their t3I Penetrating Power' (iii) Biological effect' (b) (i) - the ftrnction of anode?' In a cathode ray tube what is -- - (ii) tube' taking place in a cathode ray State the energy conversion (iii) tube' Write one use of cathode ray (c) (i) when a p nucleus of a radioactive element Represent the change ln"the (i,)Whatisthenamegiventoelementswithsarnemassnumberand difTerent atomic number? (iii)Underwhichconditionsdoesthenueleusofanatomtendtobe radioactive? T16 521 t3l t4l