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KARNATAKA TCSE SCHOOLS ASSOCIATION ICSE STD. XPreparatory Examination 2024 Subject: PHYSICS Maximum Marks: 80 Time Allowed: 2 hours Date: 29/01/2024 Answers to this Paper must be written on the paper provided separately You willnot be allowed to write during the first 15 minutes. This time is to be spent in reading the question paper. The time given at the head of this Paper is the time allowed for writing the answers. The intended marks for questions or parts of questions are given in brackets []. is compulsory. Attempt any four questions in Section B Section A SECTION I (Attempt all questions from this Section.) Question 1 Choose the correct answers to the questions from the given options. (Do not copy the question, write the correct answers only.) of the body. i) the position of centre of gravity depend on (a)shape (b) weight (c) volume (d) both aand b of W.D ii) If W.Drepresents the work done and t represents the time. then the unit of ratio and t is (a)watt m1 (b) watt m? (c) Js (d) watt i ) A man does 800 J of work in lifting a 40 kg bucket from a well. The depth of the well is (Take g = 10 m s?) (a) 1m (b) 0.5 m (c) 200 cm iv) ldentify the class 2 lever among the given options: (a) scissors (b) claw hammer (c) foot treadle (d) wheel barrow (d) 02 m Class: X Subject: Physics v) Assertion: Infrared radiations can be detected by theirheating property Reason: Infrared radiations atmosphere. are (a) both assertion and Ihi both (c) (d) Scattered less by the earth's reason are true assertion and reason are false assertion is false but reason is true assertion is true but reason is false (vi) The The refractive index of glass relative to air is %and that refractive index of glass relative to diamond is (a) 8/9 to air is diamond relative (d) 18/5 (b) 5/8 12/5. (c) 5/18 (vil) The number of vibrations made by twO waves M Mand N, in a given time intenval, is represented as shown below. M N What can be concluded about M and N? (a) M is louder than N (b) N is louder than M (c) M is shriller than N (d)N is shriller than M (vii) The effective resistance between A and B shown in the figure given below is (a)4 Q 62 (b) 6 Q (c) May be 10 Q (d) Must be 10 2 (ix) The diagram in the figure a shows of the plug matches the hole 3. three-pin socket marked 1.2 and3. (a) Earth pin (b)live pin (c) neutral pin (d) any pin (x) 2 O Commercial unit of electrical energy is (a) kWh (b) kW/h (c) kWh:2 (d) kWAh of 6 Subjec Physics Class:X Page 3of 6 (xi) In a step up transformer (a) Ns = Np (d) Ns < Np (c) Ns >Np (d) nothing can be said specificlatent heat of the substance, and Yand Z represents its (xii) lf Xrepresents themass of the substance respectively, then: heat energy and (a) Y = X/Z (b) Z = XY (c) X = Y/Z (d) Z= Y+X (xii) Gamma radiations from tumour of the patient. is used to treat cancer by killing the malignant (a) plutonium (b) cobalt (c) phosphorus (d)uranium radiations. Ihe correct way to arrange them in the (xiv)a. Band y are the three radioactive ascendingorder of their penetrating power is: (a) a< <y (b) y< <a (c) B<a<y (d) B<y<a mass number A, but different (xv) The atoms of different elements which have the same atomic number Z, are called (a) isotones (b) isotones (c) isobars (d) isomers Question -2 a mass of 0.05 kg is (i) Auniform metre scale can be balanced at the 70.0 cm mark when hung from the 94.0 cm mark. (a) Drawa diagram of the arrangement. (b) Find the masS of the metre scale. () Mention the two essential conditions for a light ray to undergo total internal reflection. ( i) Drawa simple diagram of afire tongs and mark on it the fulcrum F and th point of application of effort E. [31 (21 [2] (iv) Calculate the kinetic energy of a body of mass 0.2 kg and momentum 40 Kg ms [21 (v) Mention the differences between heat capacity and specific heat capacity. (2) (vi) Asound wave travelling in water has a wavelength 0.4 m. ls this wave audible in tie (2 air? (The speed of sound in water = 1400 m s') (vii) How does an increase in the temperature affect the specific resistance of a ()Metal and (i) Semiconductor? (2] Class X Question -3 () Mention thetwo advantages of the (u) Draw the neat position ring systern of wiring circuit diagrarm of the dual control switch to show thetulo in OtN (i) Name two tactors on does it depend on thewhich the internal resistance of a cell derends and sate ron factors stated by you? (iv) Two resistors of 4 ) and 6 9 are connected in garalel The across a 6Vbattery of conbination is nne negligible resistance of circuit,(b)resistance, the currentCalculate througr the battery (v) Write the fission reaction of Uwhen bormbarded with neutron. (a) the total SECTION II (Atternpt any four questions) Question 4 (i) The diagram in Figure shows the cornbination of two a load W. pulleys P1 and P2 used to ift up (a)State the kind of pulleys P, and P (b) State the function of the pulley P, (c) What effort E has to be applied at C to just raise the load W= 20 kgf ? the weight of the pulley P. and the friction. Neglect both T P W (i) The specific heat capacities of two liquids P and Qare 3.62 cal/g C and 2.50 cavg 9C respectively. (alBy ohserving the magnitudes of P and Qwhich substance is considered as a bad Conductor of heat. (b) Give reason for your answer. (c) Among P and Owhich substance is suitable for coolant (3] 4of 6 class:X Subject: Physics () is incidence plotted forof a determine the magnitude (i) The angle of deviation (3) vs of Curve below. Studythe curve angle and (a) Angle of prism and (b)Angle i, shown in curve. Page 5 of 6 prism shown in the [4] 65 60 60 70 Question -5 (0) Amolten metal of mass 150g is kept at its melting pointat 800 C. When it is allowed to freeze at the same temperature, it gives out 75,000 J of heat enerqy. (a) What is the specific latent heat of the metal ? (b) If the specific heat capacity of nmetal is 200 J kg K", howmuch additional heat energy willthe metal give out in cooling to - 50 C ? ( ) Copy the given equation given below and complete the folowing nuclear change. (3] [3] X, ( ) a)State two differences between energy and power. (b) A man weighing 60 kgf climbs up a ladder of height 10 m in 15 minutes. Calculate the increase in his potential energy and the power spent by him. Take 1 kgf = 10N 4] Question - 6 (i) (a) Name the principle onwhich a transformer workS. (b) What is the function of astep up transformer? (c) Can a transformer work when it is connected to a d.c. source ? Give a reason. ( ) (a) Draw aneat labelled diagram of a.c generator. (b) State the energy conversion takes place in the generator. [3) (ii)The diagram below shows acooling curve for 200 g of water. The heat is extracted at the rate of 100 J/s. Answer the questions that follow: (a)Calculate specific heat capacity of water. (b) Heat released in the region BC. [4] b0 heat () 8dckA Class: X Subject: Physics Question -7 ()Give Page 6 of 6 reasons for the following: (a) Ultraviolet bulbs have a quartz envelope instead of glas>. (b)Infrared are radiations used for (c) Why does the sky appear blue inphotography in to9 [3] colour? () (a) Can the absolute refractive index of a be less than one (0) A COln placed at the bottom of abegkormedium annears to be raised by 4.0 G. retractive index of water is 4/3 find the denth of the water in the bedakel: (l1) (a) List the factors on which the mannatic field strenath bya current carrying conductor depends. n(3] stralgnt (b) State the rule which gives the direction of its Tield. current carrying (C) MMention the pattern of maanetic field lines duemagnetic to a straight conductor. [4] Question - 8 () A wire of resistance 3 ohm and length 10 cm is stretched to length 30 cm. Assuming that it has a uniform cross section, what will be its new resistance? 6 [3] () Where must an object be placed in front of a convex lens of focal length 20 cm to obtain a real and four times magnified image ? Where will the image form? heyd d ) [3] (iii) A lens forms areal, inverted and magnified,image of an object. (a) Name the kind of lens. (b) Draw aray diagram to show the formation of the image. [4] Question - 9 (0) (a) Name the part of the electromagnetic spectrum of wavelength 10 nm to 400 nm and mention its one application. (b) Name the lens which gives us a magnification of -1. (3) () (a) State two differences between the forced and resonant vibrations. (b)State the condition for resonance to ocur. [3] (i) Eor a science exhibition, two students Aand Bbrought two similar exhibits. Both the eyhibits consist of a coil placed in the magnetic field. Student Arotates the coil anda the bulb connected to it glows. Student B passes current through the coil and the coil rotates. (a) Name the phenomena involved with the exhibit of student A. ce (b)State the principle based on which the exhibit of student Bworks. eusto maqncle mdea (c) List the application of the above exhibits in daily life. (4] tastone ****************t******
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