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ICSE Class X Prelims 2025 : Physics (Dhirubhai Ambani International School (DAIS), Mumbai)

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DHIRUBHAI AMBANI INTERNATIONAL SCHOOL PRELIMINARY EXAMINATION 2024- 2025 Subject: Physics Std: Date: January 13,2025 XA Time: 2 hours Marks: 80 Answers to this Paper must be written on the paper provided separately. You will not be allowed to write during the first 15 minutes. This timeis 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. Section Ais compulsory. Attempt any four questions from Section B. The intended marks for questions or parts of questions are given in brackets []. This paper has 17 printed pages. SECTION A (Attempt all questions from this Section.) Question1 () Choose the correct answers to the questions from the given options: Which of the following is an example of a transverse anda longitudinal wave? transverse (a) light longitudinal water ripples (b) radio Sound (c) SOund light (d) water ripples radio [15) DHIRUBHAI AMBANI INTERNATIONAL SCHOOL (i) The sounds produced by two musical instruments are directed towards amicrophone connected to an oscilloscope. The waveforms produced on the Screen are shown. The waveforms show that the sounds produced have a different property. What is the property? (a) frequency (b) speed (c) timbre (quality) (d) wavelength (ii) An electric heater consists of a heating element mounted on a metal reflector. The reflector is connected to earth. Where should the switch for the heatingelement be connected? (a) between the earth wire and the reflector (b) between the live wire and the heating element (c) between the live wire and the neutral wire (d) between the neutral wire and the heating element 2 DHIRUBHAI AMBANI INTERNATIONAL SCHOOL (iv) The diagram shows part of an electric circuit. What is the current in the 22 resistor? 29 82 52 52 6.0A (a) 0.6 A (b) 1.2 A (c) 3.0 A (d) 6.0 A (v) like a pendulum across a The diagram shows ametal bar swinging induces an e.m.f. between the ends uniform magnetic field. The motion of the bar. pivot magnetic field complete e.m.f.during one this represents Which graph and finishing at P? starting bar, the oscillation of DHIRUBHAJ AMBA1 INTEATONA SCHoOt (a) e.mf. e.m.f.i e mfA time/ (vi) () (c) (b) em.fA time time time The diagram shows a wheelbarrow and its load, which has a total weight of 150 N. This is supported by a vertical force F at the ends of the handles. 150 N 0.75 m 0.75 m What is the value of F? (a) 75 N (b) 150 N (c) 225N (d) 300 N (vi) In afission reactor, which particle causes split? (a) alpha particle (b) gamma ray (c) neutron (d) proton 4 a Uranium-235 nucleus to DHIRUBHAL AMBANI INTERNATnONAL SCHOOL (vii) In each of the circuits below, a short circuit occurs. In which circuit would the fuse blow and make the circuit safe to repair? (b) (a) live live short circuit short circuit neutral neutral (d) (c) live live short circuit short circuit neutral neutral (ix) Electricalenergy is transmitted at high alternating voltages. What is not avalid reason for doing this? (a) At high voltage, a.c. is safer than d.c. (b) For agiven power, there is a lower current with a higher voltage. (c) There is a smaller power loss at higher voltage and lower current. (d) The transmission lines can be thinner with a lower current. 5 (x) Some ce cubes are taken from a deep-freeze and plae0 in a meta Container. The container is heated at aconstant rate and readings of temperature and time are taken. The resuits are recorded on a graph. VWhich tenperature corresponds to O C? temperature (a) (b) (c) (d) time (xi) A lens forms a blurred image of an object on a screen. object lens Screen How can the image be focused on the screen? (a) by moving the object away from the lens and screen (b) by moving the screen away from the lens and object (c) by using a brighter object at the same position (d) by using a lens of longer focal length at the same position (xii) Two forces F1 and F2 act on an object O in the directions shown. F2 6 DHIRUBHAI AMBANI INTERNATIONAL SCHOOL What is the direction of the resultant force? (a) (xii) (c) (b) (d) A flat lamina is freely suspended from point P. The weight of the lamina is 2.0 N and the center of mass is at C. lamina PC = 0.50 m PQ = 0.40 m QC = 0.30m The lamina is displaced to the position shown. What is the moment that will cause the lamina to swing? (a) 0.60 N m clockwise (b) 0.80 N m anticlockwise (c) 1.0 Nm clockwise (d) 1.0 Nm anticlockwise (xiv) Assertion (A): A movable pulley provides a mechanical advantage of 2. Reason (R): In a movable pulley, the tension in the rope is shared equally by the load and the effort. (a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion. (b) Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion. (c) Assertion is true, but Reason is false. (d) Assertion is false, but Reason is true. 7 DHIRUBHAI AMBANI INTERNATriONAL SCHOOL (xv) about the uses of electromagnetic Gamma rays are used in medical treatment. Below are four statements radiation. Infra-red waves are used in sunbeds. Microwaves are used in satellite television. X-rays are used in intruder alarms. How many of these statements are correct? (a) 1 (b)2 (c) 3 (d) 4 Question 2 () Complete the following by choosing the correct answers from the bracket. (a) The bending of light occurs because the (wavelength, speed, frequency] of light is different in the two media. The extent of (b) (c) bending depends on the [refractive index, medium of thickness, angle of incidence] of the two media. The commutator in a DC motor is used to reverse the [direction, magnitude, frequency] of current in the coil. WVhen resistors are connected in parallel, the total resistance decreases, increases, remains constant] as more resistors are added. (d) The magnetic flux through a coil change with time, inducing a current in the circuit. This phenomenon is explained by [Lenz's, Faraday's, Coulomb's] law. (e) A convex lens is used as a magnifying glass when the object is placed [at, within, beyond] the focal length of the lens. [6] DHIRUBHAIAMBANI INTERNATIONAL SCHOOL () Moon is revolving around the earth. Howmuch work is done by the [2] moon in doing so? Give a reason for your answer. () Calculate the mass of ice required to lower the temperature of 300 g of (2] water at 40 C to water at 0 C. (Specific latent heat of ice =336J/g. Specific heat capacity of water = 4.2 Jlg C) Question3 () Auniform metre scale of weight 50 gf is balanced at the 40 cm mark, [2] when a weight of 100 gf is suspended at the 5 cm mark. Where must a weight of 80 gf be suspended to balance the metre scale ? (ii) Aray of light enterS a glass slab ABCD as shown in the diagram given [2] below. The critical angle of glass is 42 .Complete the path of ray till it emerges from the slab. Mark the angles in the diagram wherever necessary. 420 C (ii) Calculate the value of the resistance which must be connected to a 15 Q resistance to provide an effective resistance of 6 0. (iv) Refer to the diagram given below: (a) Explain how the focal length of the lens will be affected if p, > . (b) Describe the path of a ray of light passing through the lens [2] DHIRUBHA AMBANI INTERNATIONAL SCHOOL (v) How is the kinetic energy of a moving cart affected it: (a) its mass is doubled. (b) its velocity is reduced to one fourth of the initial (vi) velocity. (a) Define specific heat capacity. (b) Equal masses of water and mercury are placed in two beakers. The following graph shows the cooling curve for the two liquids. ldentify A Temp C Time A and B and justify your answer. (vi) (a) Why does the critical angle depend on the refractive index of the [3] medium? (b) Describe how total internal reflection helps improve the efficiency of prismatic periscopes in submarines. SECTIONB (Attempt any four questions.) Question 4 (0) The diagram given below shows an object O and its image I. Copy and complete the diagram (not to scale) by drawing suitable rays to locate the lens and its focus. Name the type of lens used. 10 (3] DHIRUBHAI AMBANI INTERNATnONAL SCHOOL (0) A diver in water looks obliquely at an object AB in air. [3] Air D B Water A Eye of the Diver (a) Does the object appear taller, shorter or of the same size to the diver? (b) Show the path of two rays AC and AD starting from the tip of the object as it travels towards the diver in water and hence obtain the image of the object. (i) An object of height 6.0 cm is placed at adistance 12 cm in front of a [4] convex lens of focal length 8 cm. (a) Find the position and size of the image. (b) State the characteristics of the image. Question 5 () (a) What is the unit of mechanical advantage? (b) Give one reason why the mechanical advantage of amachine is lesser than its velocity ratio. (c) How can you increase the mechanical advantage of a lever? 11 [3] DHIRUBHAI AMBANI INTERNATIONAL SCHOOL (ii) (a) What is the mechanical advantage of the system shown inthe diagram given below? effort load (b) DrawW a diagram to depict how you would arrange the if the mechanical advantage had to be maintained ,with onlypulleys, 3 pulleys. (i) (a) Draw a neat and labelled diagram to show the Convex lens and object to match the arrangement in a slide projector. (b) State the arrangement of a [4] characteristics of the image formed. Question 6 () A boy stands 60 m in front of a tall wall and claps. The boy continues to clap every time an echo is heard. The time taken for 50 claps is 18 seconds. Calculate the speed of sound. 12 [3] DHIRUBHAI AM8ANI INT (0) WATIONAL SsCHOOL When a person adjusts the tuner of a radio, they change its settings to [3] pick up the desired station's frequency for clear sound reception. a radio (a) How does adjusting the tuner on help you listen to aspecific station? (ii) station clearly at a time, even (b) Why does a radiopick up only one when multiple stations are broadcasting? the radio fails to match the (c) What would happen if the tuner on frequency of the desired station? incident on an equilateral The diagram given below shows a ray of light position. glass prism placed in minimum deviation the refracted (a) Copy the diagram and complete it to show the path of ray and the emergent ray. which (b) What should be the angle of incidence for a ray of light suffers minimum deviation of 38 through an equilateral prism. 13 [4] DHIRUBHAI AMBANI INTERNATIONAL SCHOOL LJ Question 7 The diagram below shows the core of atransformer and its input and output connections. [3] cORE INPUT 220 V A.C. MAINS OUTPUT 44 VA.C. (a) State the material used for the core. (b) Copy and complete the diagram of the transformer by drawing input and output coils. () Electromagnetic waves play a crucial role in communication and daily life. Intess Vistble Lght (a) Why are microwaves used in satellite communication instead of radio waves? (b) How does the wavelength of ability to penetrate (c) electromagnetic waves affect their through materials? Provide an example. Explain why ultraviolet rays can cause sunburn while visible light cannot, even though both are electromagnetic waves. (3] DHIRUBHAI AMBANI INTERNATIONAL SCHOOL ( i) Specific heat capacity of a substance Ais 3.8 joule/ g K, whereas [4] Specitic heat capacity of substance B is 0.4 Jlg K. (a) Which of the two is good conductor of heat? Explain. useiu (0) IT substancesAand B are liguid which one would be more car radiators? added to 300 a of cold water at 10C. (C)200 g of hot water at 800C is the balculate the final temperature of the mixture of water. Consider negligible. (Specific heat heat taken by the container to be of water = 4200 J/kg C-1 Question 8 capacity 238 number 92 and mass number atomic with nucleus (a)A radioactive number particles changing its mass B and particles a emitscertain of a and 3 84. Calculate the number to number atomic and to 214 particles emitted. (b) 'Radioactivity is a nuclear [3] phenomenon.' Comment on this statement. (i) a current The diagram given below shows carrying solenoid: Y X of the faces (a) How will you determine the polarity of the coil on the basis of direction of flow of current? (b) State the polarity in the given 15 arrangement at X and Y. [3] DHIRUBHAI AMBANI INTERNAnONAL SCHOOL (i) The figure given belowshows a radioactive source S in a thick lead [4] walled container having a narrow openina. The radiation passes through an electric field between the plates A and B. (a) Complete the diagram to show the paths of a, Band y radiations. (b) Why is the source 'S' kept in a thick lead walled container with a narrow opening? (c) Which radiation is deflected the most? Give reason. (d) Name the radiation which is unaffected by the electrostatic field. Question 9 (0) Copy the diagram given below and complete the path of the light ray till itemerges out of the prism. The critical angle of glass is 42 . In your diagram mark the angles wherever necessary. A 60 B 16 80 [3] () DHIRUBHAI AMBANI INTERNADo Adevice is SCHOOL rated at 1000 kVA -220 V. (a) Calculate the electrical energy Consumed [3] by it in the month of November when used for 4hours aday on an average in kWh and Slunit. (b) Two fuse wires of the Which of same length are rated 20 A and 5 A. the two will be thicker and why? (ii) A Cell ofe.m.f. 2.O V and internal resistance 0.5 Q is connected to wo resistors of 10.0 Qand 5.0 Oin series as shown in the figure beloW. Calculate the: (a) Current in the circuit. (b) Potential difference across the cell. (c) Voltage drop when the current is flowing. E= 2V H ir.=0.5n W 102 ******: 17 52 [4]

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