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ICSE Class X Board Exam 2024 : Physics

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PHYSICS (SCIENCE PAPER 1) Maximum Marks: 80 Ti,ne allowed: Two hours Answers to this Paper must be written on the paper provided separately. You will not be allowed to write duringfirst 15 minutes. This time is to be spent in reading the question paper. Tl,e time given at the head of this Paper is the time allowed for writing the answers. Section A is compulsory. Attempt any four questions from Section B. The intended marks for questions or parts ofquestions are given in brackets [}. SECTION A (40 Marks) (Attempt all questions from this Section.) Question 1 Choose the correct answers to the questions from the given options. [ 15] (Do not copy the questions, write the correct answers only.) (i) (ii) When a bell fixed on a cycle rings, then the energy conversion that takes place is: (a) gravitational potential energy to sound energy (b) kinetic energy to sound energy.. (c) sound energy to electrical energy (d) sound energy to mechanical energy A door lock is opened by turning the lever (handle) of length 0.2 m. If the moment of force produced is I Nm, then the minimum force required is: (a) 5N (b) 10 N (c) 20 N (d) 0.2 N T24 521 Copyright reserved. This Paper consists of 12 printed pages. Turn Over .. 1 (iii) (iv) . the figure below . For the calcu lation , A force 'F' 111oves a load from Ato c as shown 1n of the work done, which of these lengths wou ld You use as the displa ceme nt? (a) J1n .. (b) 41n (c) 5111 (d) 7m C 3m 4-m A radioactive nucleus containing 128 nucleons emits a B P- particle. After ~ - emiss ion the nu1nber of nucle ons present in the nucleus will be: (v) (a) 128. (b) 129 (c) 124 (d) 127 Asser tion (A): Ultrav iolet radiati ons are scatte red more as comp ared to the micro wave radiat ions. Reaso n (R): (vi} T24 521 Wave length of ultrav iolet radiat ion is more than the wavel ength of micro wave radiati on. (a) Both A and Rare true. (b) A is true but R is false. (c) A is false but R is true. (d) Both A and Rare false. When the stem of vibrat ing tuning fork is presse d on a table, the tablet op starts vibrat ing. These vibrat ions are defini tely an examp le of: (a) resona nce (b) natura l vibrat ions (c) forced vibrat ions r (d) damp ed vibrat ions 2 WWW (vii) (viii) 1 EM Which of the following is a class III lever? (a) Pair of scissors (b) Wheelbarrow (c) Crowbar (d) Human forearm .. The specific resistance of a conductor depends on its: (a) length (b) material .. (c) area of cross section (d) radius (ix) Identify the option that displays the correct wiring with correct colour code: (a) (b) APJ>I.IANCE . . Bro\\n wire 1 I APPLIANCE Mains 1 I . Brown wire Blue wire I~ I I 1lltnS I . Yellon' "11.e (d) (c) APPLIANCE APt>I.IANCE ' I l\1ah11 -Hrown wire .__ __ 1 124 521 1 Uluc wire OrO\rn \\irt 3 I Milius 1 I I \t'llow wirt' Turn Over t ~- ~-"' ~~.z-=- ,,_,,___ . ~A?~nJe'Yl .S!llrM"ttft. r:ISN!>i I ! 11 n a closed electric circuit is: . 1 f , The potential difference between term1na s o a ce 1 (x) I I r ' 'i I I (xi) r I (xii) @ (a) terminal voltage " (b) electro 1notive force (c) voltage drop (d) none of these During melting of ice at 0 C the: (a) energy is released and temperature remains constant. (b) energy is absorbed and temperature remains constant. (c) energy is released and temperature decreases. (d) energy is absorbed and temperature increases. Linear magnification(m) produced by a concave lens is:_ (a) m < 1- (b) m> 1 (c) m= 1 (d) m=2 A radioactive element is placed in an evacuated chamber. Then the rate of radioactive decay will: 4 521 (a) Decrease (b) Increase (c) Remain unchanged (d) Depend on the surrounding temperature 4 (xiv) The graph given below shows heat energy supplied against change in temperature when no energy is lost to the surrounding. The slope of this graph will give: (a) Specific heat capacity (b) Latent heat of fusion , (c) Latent heat of vaporization (d) Heat capacity heat energy (0, 0) (xv) change in temperature A block of glass is pushed into the path of the light as shown below. Then the converging point X will: (a) Move away from the slabv (b) Move towards the slab (c) Not shift (d) Move towards the left side of the lens Question 2 (i) (i) In the following atoms, which one is a radioisotope? Give one use of this isotope. [3] 016, c14, Nl4, He4 (b) Name the class of the lever shown in the picture below: ,~.:a;~ I ; ,I ( \ \ , Bottle \ (ii) Fill in the blanks: (a) When a stone tied lo a string is rotated in a horizontal plane, the tension in the string provides _ __ (b) T24 521 [2] force necessary for circular motion. Work done by this force at any instant is _ _ __ 5 Turn Over I (iii) A non unifonn beam of weight 120 N pivoted at one end is shown in the diagram _below. [2] Calculate the value of F to keep the beam in equilibrium. , 0.20 m , t I I I I ------, t I t r------ -. ~ -. C.G. Pivot . 0 O.BOm Weight 120 N (iv) ............' I .,., F Meera chose to use a block and tackle system of '9' pulleys instead of a single movable [2] pulley to lift a heavy load. (a) What is the advantage of using a block and tackle system over a single movable pulley? @ (v) Why should she connect more number of pulleys in the upper fixed block? Sumit does 600 J of work in 10 min and Amit does 300 J of work in 20 min. Calculate [2] the ratio of the powers delivered by them. 5 bulbs are connected in series in a room. One bulb is fused. It is removed and [2] remaining 4 bulbs are again connected in series to the same circuit. What will be the effect on the followi_ng physical quantities? (Increases, Decreases, Re1nain Same) (a) Resistance (b) Intensity of light (vii) Rohan conducted experiments on echo in different media. He observed that a minimum [2] distance of 'x' meters is required for the echo to be heard in oxygen and 'y' meters in benzene. Compare 'x' and 'y'. ~fy yo;::w;3 .-'J Wl; Speed of sound in oxygen: 340 ms 1 Speed of sound in benzene: 200 ms 1 Question 3 (i) (a) In a reading glass what is the position of the object with respect to the convex lens used? (b) Why can we not use concave lens for the same purpose'? T24 521 6 [2] (ii) A fuse is rated 5 A. Can it be used with a geyser rated 1540 W, 220 V. Write Yes or No. Give supporting calculations to justify your answer. [2] @~ State two factors affecting the speed of rotation of the coil in a D.C. motor. [2] (iv) How much heat is required to convert 500 g of ice at 0 C to water at 0 C? The latent r2J heat of fusion of ice is 330 @ Jg 1. Copy and complete the nuclear reaction by filling in the blanks. 92 u2Js + on I 56Ba--- [2) + --- Kr92 + 3 on' SECTION B (40 Marks) (Attempt any four questions from this Section.) Q~n4 (i) The image of a candle flame placed at a distance of 36 cm from a spherical lens, is formed on a screen placed at a distance of 72 cm from the lens. Calculate the focal [3] length of the lens and its power. (ii) Below is an incomplete table showing the arrangement of electromagnetic spectrum [3] in the increasing order of their wavelength. Complete the table. Gamma ray (iii) X-ray UV rays Visible rays Infrared A Radio waves (a) Identify the radiation A. (b) Name the radiation used to detect fracture in bones. (c) Name one property common to both A and Radio waves. (a) Why do we use red colour as a danger signal on the top of a skyscraper? (b) The diagram below shows the path of a blue ray through the prism: l. 2. (4) A Calculate the critical angle of the material of the prism for blue Blue colour. ray_,,__ ""'+~--~..... What is fhe measure of the angle \ of this pris~ (A)? 3. T24 521 Which colour should replace the blue ray, .for the ray to undergo Total Internal Reflection? 7 Turn Over Quest~rin 5 i (i) (a) Refractive index of glass with respect to water is 9 8. [3) Find the refractive index of water with respect to glass. (b) Name the principle used to find the value in purl (a). (c) Ifwe change the temperatu re of water, then wi11 the ratio 9 8 remain the same? Write Yes or No. (ii) Light travels a distance of '}Ox' units in time 't1' in vacuum and it travels a distance of 'x' units in time 'ti' in a denser medium. Using this information answer the question [3} that follows: (a) 'Light covers a distance of '20x' units in time 't,' in diamond. State true or false. (b) Calculate the refractive index of the medium in terms of (iii) '11 'and 't2 . A monochromatic ray of light is incident on an equilateral prism placed at minimum deviation position with an angle of incidence 45 as shown in the diagram. (a) (4) Copy the diagram and complete the path of the ray PQ. (b) State two factors on which the angle of deviation depends. Q~ion6 (i) (3) (a) Define Centre of Gravity. (b) A hollow ice cream cone has height 6 cm. 1. Where is the position of its centre of gravity from the broad base? 2. Will its position change when it is filled completely with honey? Write Yes or No. '1'24 521 8 (ii) . [3] Marble A ' I I Path 2 10m 10m L, I Two identical marbles A and B are rolled down along Path 1 and Path 2 respectively Path l is frictionless and Path 2 is rough. (iii) (a) Which marble will surely reach the next peak? (b) Along which path/s the mechanical energy will be conserved? (c) Along which path/s is the law of conservation of energy obeyed ? (4] Given are two pulleys. (a) Copy and complete the labelled diagram connecting the two pulleys with a tackle to obtain Velocity Ratio = 2. (b) If Load = 48 kgf and efficiency is 80% then calculate: ~on7 (i) (a) 1. Mechanical Advantage. 2. Effort needed to lift the load. Name the waves used in SONAR. [3] (b) 170m liff 160 m In the above diagram Lata stands between two cliffs and claps her hands. Determine the time taken by her to hear the first echo. Speed of sound in air 320 ms . T24 521 9 Turn Over - (ii) (a) --[3 J Complete the following radioactive rea(;tion: =x-+ Y (b) ------- +~He -+ 2 itz + -~e two isotopes Uranium is available in two forms U-235 an<l U-238. Which of the of Uranium is more fissionable? (iii) of a burette filled In the given diagram, a vibrating tuning fork is kept near the mouth tap of the burette. with water. The length of the air column is adjusted by opening the [41 At a length of 5 cm of the air column, a loud sound is heard. ----....-- Tuning fork 5cm --W ater (a) Name the phenomenon illustrated by the above experiment. (b) Why is a loud sound heard at this particular length? (c) ncy, should If the present tuning fork is replaced with a tuning fork ofhigher freque sound? Give the length of the air column increase or decrease to produce a loud a reason. Question 8 (i) table given The voltage - current readings of a certain material are shown in the 30V 20V 10 V Voltage (V) Current (I) 3A 2A 4A Study the table. L4521 (a) State whether the conductor used is ohmic or non-ohmic. (b) Justify your answer. (c) State Ohm's law. 10 below: [3] (ii) Below is f3 I the diagram of a transformer: iron core - --- -- I I I secondary coil primary coil (a) Identify the type of transformer. (b) In this type of transformer which of the wire is thicker, the primary or th e secondary? Give a reason. (iii) [4] Study the diagram: 10.Q 6.{l 12n 4n 4V (a) Calculate the total resistance of the circuit. (b) Calculate the current drawn from the cell. (c) State whether the current through 10 n resistor is greater than, Jess than or equal to the current through the 12 n resistor. --T24~552211_ _ _ _ _ _ _ _ _JJII- - - - - - - ----- Question 9 (i} certain mass of ice. Find the ma~s of 85 g of water at 30 C is cooled to 50c by adding [3] ice required. 1 ] Jg336 on= fusi of heat t laten ific Spec lSpecific heat capacity of wate r= 4.2 Jg toc-t, l ii) (a) (h) s start freezing? Why does it become pleasantly warm when the lake you expect in the average kinetic \Vater freezes to form ice. What change would [3] energy of the molecules? ( c) (iii) (a) (b) 0 C or l g wate r at 0 C? Which will contain more heat energy 1 g of ice at ced current in an AC generator. State one factor that affects the magnitude of indu t of electric current. ABC D is Given below is a circuit to study the magnetic effec r XY. A magnetic compass is a cardboard kept perpendicular to the conducto the positions of the magnetic placed at the point P of the cardboard. P1 and P2 are gh XY resp compass, before and after passing a current throu t ectively. N D.C P;' - SUPPL C 1. 2. tion of defl ectio n of the Name the rule that is used to predict the direc magnetic compass. to y or y to X) whe n the State the direction of current in the conductor (X circuit is complete. 3. T24 521 th ef-c.ect If resistance R is increased, then what will be the 11 on e magnetic lines of force around the conductor? 12 [4]

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