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ICSE Class X Board Exam 2024 : Physics

12 pages, 79 questions, 54 questions with responses, 134 total responses,

Shikhar Karmakar
Gokuldham High School & Junior College (GHS), Mumbai
1st to 10th science

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PHYSICS (SCIENCE PAPER1) Maximum Marks: 80 Time allowed: Two hours Answers to this Paper must be written on the paper provided separately. You will not be allowed towrite during first 15 minutes. This time is to be spent inreading the question paper. The time given at the head of this Paper is the time allowed for writing the ansSwers. Section Ais compulsory. Atempt any four questions from Section B. The intended marks for questions or parts of questions are given in brackets | J. 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.) 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 (ii) force produced is 1 Nm, then the minimum force required is: (a) 5N (b) 10 N (c) 20 N (d) 0.2N T24 521 Copyright reserved. This Paper consists of 12 printed pages. Turn Over (ii) (iv) A force 'F' moves a load from AtoC as shown in the figure below. For the calculation of the work done, which of these lengths would you use as the displacement? (a) 3m (b) 4m (c) Sm (d) 7m 5 m 3m A 4 m B A radioactive nucleus containing 128 nucleons emits a B- particle. After - emission the number of nucleons present in the nucleus will be: (v) (a) 128 (b) 129 (c) 124 (d) 127 Assertion (A): Ultraviolet radiations are scattered more as compared to the microwave radiations. Reason (R): Wavelength of ultraviolet radiation is more than the wavelength of microwave radiation. (a) Both A and R are true. (b) A is true but R is false. (vi) T24 521 (c) A is false but R is true. (d) Both A and R are false. When the stem of vibrating tuning fork is pressed on a table, the tabletop starts vibrating. These vibrations are definitely an example of: (a) resonance (b) natural vibrations (c) forced vibrations (d) damped vibrations (vi) Which of the following is a class III (a) Pair of scissors (b) Wheelbarrow (c) Crowbar lever? (d) Human forcarm (vi) The specific resistance of a conductor (a) length (b) material (c) area of cross section depends on its: (d) radius (ix) ldentify the option that displays the correct wiring with correct colour code: (a) (b) APPLJANCE Mains Brown wire APPLIANCE Blue wire (c) Mainsvellow wire (d) APPLIANCE Mains Brown wire T24 521 Brown wire APPLJANCE Blue wire Brown wire 3 Mains Yellow wire Turn Over (x) (xi) (xii) Ihe potential difference between terminals of acell in a closed electric circuit is: (a) terminal voltage (b) electro motive 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) (xiii)' m <1 (b) m>1 (c) m=1 (d) m=2 Aradioactive element is placed in an evacuated chamber. Then the rate of radioactive decay will: T24 52 1 (a) Decrease (b) Increase (c) Remain unchanged (d) Depend on the surrounding temperature 4 (xiv) The graph given n0 cnergy is below shows hcal encrgy supplicd against change in teinperature whcn lost to the surroundmg. (a) Specilic heat capacity (b) Latent heat of tusion (e) Latent hcat of vaporization The slopc of this graph will give: heat cnergy (d) Heat capacity (0, 0) change in temperature (xV) Ablock of glass is pushed into he path of the light as shown below. Then the converging point X will: (a) Move away from the slab (b) Move towards the slab (c) Not shift (d) Move towards the left side of the lens Question 2 () (a) In the following atoms, which onc is a radioisotope? Give one use of this isotope. ol, C4, N'4, He (b) (n) Name the class of the lever shown in the picture below: Bottle Fill in the blanks: (a) When a stone ticd to a string is rotated in a horizontal plane, the tension in the string provides force necessary for circular motion. (b) Work done by this torcc at any instant is 124521 Turn Over |3| (ii) Anon uniform beam of weight |20 Npivoted at one end is shown in the diagram below Calculate the value of F to keep the bcam in cquilibrium. 0 20 m "C.G. Pivot 0.80 m Weight 120 N (iv) Meera chose to use a block and tackle system of '9' pulleys instead of asingle movable 12) pulley to lift a heavy load. (a) What is the advantage of using a block and tackle system over a single movable pulley? (b) (v) Why should she connect more number of pulleys in the upper fixed block? Sumit does 600 Jof work in 10 min and Amitdoes 300 Jof work in 20 min. Calculate (2] the ratio of the powers delivered by them. (vi) 5 bulbs are connected in series in a room. One bulb is fuscd. It is removed and |2] remaining 4 bulbs are again connected in series to the same circuit. What will be the effect on the following physical quantities? (Increases, Decrcases, Remain Same) (vii) (a) Resistance (b) Intensity of light Rohan conducted experiments on echo in different media. He observed that a minimum distance of 'x' meters is required for the echo to be heard in oxygen and p' meters in benzene. Compare x' and 'y' Justify your answer. [2| Speed of sound in oxygen: 340 ms Speed of sound in benzene: 200 ms-! Question 3 (i) (a) Ina reading glass what is the position of the object with respect to the convex lens used? (b) T24 521 hy can we not use concave lens for the same purpose? 6 [2| (i0) Afuse is rated 5 A. Can it be used with a gevser rated 1540 W, 220 V. Write Yes or (2] No Give supporting calculations to justify your answer. (ii) State wo 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 [2] () Copy and complete the nuclear reaction by filling in the blanks. heat of fusion of ice is 330 Jg-l 92U235 + on s6Ba +. . Kr [2] +3 on' SECTION B(40 Marks) (Atempt any four questions from this Section) Question4 (0) The image of acandle flame placed at a distance of 36cm from a spherical lens, is [3] formed on a screen placed at a distance of 72 cm from the lens. Calculate the focal length of the lens and its power. (1) Below is an incomplete table showing the arrangement of electromagnetic spectrum in the increasing order of their wavelength. Complete the table. Gamma ray (1) X ray UV Visible rays rays Infrared Radio A (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. waves (a) Why do we use redcolour as a danger signal on thetop of a skyscraper? (4] (b) The diagram below shows the path of a blue ray through the prism: 1. A Calculate the critical angle of the material of the prism for blue Blue ray colour. 2. What is the measure of the angle 133 B of this prism (A)? 3. Which colour should replace the blue ray, for the ray to undergo Total Internal Reflection? T24521 [3] Turn Over Question 5 (i) (a) Refractive index of glass with respect to water is 8 Find the refractive index of water with respect to glass. (b) Namne the principle used to find the value in part (a). 9 (c) If we change the temperature of water, then will the ratio remain the same? Write Yesor No. (i) Light travelsa distance of 10x' units in time t' in vacuum and it travels a distance of x units in time ; ' in adenser medium. Using this information answer the question 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 't'and 12. (i) 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) Copy the diagram and complete the path of the ray PQ. N 60" (b) State two factors on which the angle of deviation depends. 60" 60" Question 6 i) (a) Define Centre of Gravity. (b) A hollow ice cream cone has height 6 cm. 1. 2. Where is the position of its centre of gravity from the broad base? Willits position change when it is filled completely with honey? Write Yes or No. 24 52I 8 Marble (0) (3) AB Path 1 Path 2 10 m 10m Two identical marbles A and B are rolled down along Path 1and Path 2 respectively. Path 1is frictionless and Path 2 is rough. (a) Which marble willsurely 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? (ii) Given are two pulleys. [4) (a) Copy and complete the labelled diagram connecting the two pulleys with a tackle to obtain Velocity Ratio = 2. (b) IfLoad = 48 kgf and efficiency is 80% then calculate: 1. Mechanical Advantage. 2. Effort needed to lift the load. Question 7 (a) Name the waves used in SONAR. (3) (b) 170 m Cliff A 160 m Cliff B 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 Turn 0ver (ii) (a) Complete the following radioactive reaction: X Y +$He Z +-e (0) Uranium is available in two forms U-235 and U-238. Which of the two isotopes of Uranium is more (ii) fissionable? In the given diagram, a vibrating tuning fork is kept near the mouth of a burette illed with water. The length of the aircolumn is adjusted by opening the tap of the burette. Ata length of 5cm of the air column, a loud sound is heard. Tuning 5 cm fork -Water (a) Name the phenomenon illustrated by the above experiment. (b) Why is a loud sound heard at this particular length? (c) Ifthe present tuning fork is replaced with a tuning fork ofhigher frequency, should the length of the air column increase or decrease toproduce a loud sound? Give a reason. Question 8 (i) The voltage -current readings of a certain material are shown in the tablegiven below: Voltage (V) 10 V 20 V 30 V Current () 2A 3A 4A Study the table. (a) State whether the conductor used is ohmic or non-ohmic. (b) Justify your answer. (c) State Ohm's law. 10 (i) Below is the diagram of a transformer: [3) iron core primary coil secondary coil (a) Identify the type of transformer. (b) In this type of transformer which of the wire is thicker, the primary or the secondary? Give a reason. (ii) Study the diagram: [4] 102 62 12 2 124 521 (a) Calculate the total resistance of the circuit. (b) Calculate the current drawn from the cell. (c) State whether the current through 10 s2 resistor is greater than, less than or equal to the current through the 12 Q resistor. 11 Question 9 (i) certain mass of ice. Find the masS o! adding by 5 C to cooled is 30 C 85 g of water at ice required. (ii) Specific latent heat of fusion = 336 Jg"] Jg- cl, 4.2 = water of capacity (Specificheat lakes start freezing? Why does it become pleasantly warm when the (a) would you expect in the average kinetic Water freezes to form ice. What change (b) [3 energy of the molecules? (c) (iii) (a) Which water at 0 C! willcontain more heat energy 1g of ice at 0 C or lg State one factor that affects the magnitude of induced current in an AC generator. effect of electric current. ABCD is (b) Given below is a circuit to study the magnetic magnetic compass is acardboard kept perpendicular to the conductor XY. A positions of the magnetic placed at the point P of the cardboard. Pi and P2 are the XY respectively. compass, before and after passing a current through A Pi D.C sUPPLY P2 1. direction of deflection of the Name the rule that is used to predict the magnetic compass. 2. X) when the State the direction of current in the conductor (X to Y or Y to circuit is complete. 3. the magnetic If resistance R is increased, then what will be the effect on lines of force around the conductor? T24 52I 12 141

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