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ICSE Class X Prelims 2024 : Physics (Pawar Public School (PPS), Hadapsar, Pune)

12 pages, 71 questions, 20 questions with responses, 21 total responses,

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Pawar Public School (PPS), Hadapsar, Pune

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PAWAR PUBLICSCHOOL. HADAPSAR, PUNE PRELIMINARY EXAMINATION (2023-2024) SUBJECT -PHYSICS Std.: X Date: 12/01/2024 Max. Marks: 80 Duration: 2 h Answers to this Paper must be written on the paper provided separately. Youwill not be allowed to write during the first 15 minutes. This time is to be spent in the reading Question Paper. The 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 of questions are given in [J. SECTIONA Attempt all questions from this Section. Question 1 Select the correct option for each of the |Do not copy the following questions. question, write the correct answers only.] () [15] M.A. of a machine is independent of which factor? a) The weight of a pulley b) Friction between pulley and string c) The length of the string d) Direction of force (ii) What is the ratio of kinetic energies of two bodies of mass m and 2m moving with the same speed? a) 1:2 b) 2:1 c) 1:4 d) 4:1 (iii) The energy conversion in a dynamo is... a) b) d) Electrical energy to mechanical energy Mechanical energy to electrical energy Chemical energy to mechanical energy Mechanical energy to chemical energy This paper consists of 12 printed pages Turn over (iv) Aradioactive source emits three types of radiations. Name the radiation of zero mass. Name the radiation which has the lowest ionising power. Name the radiation which has the lowest penetrating power. a) B,y and a b) Y, a and B a, Band Y Y, Yand a (v) The ratio of the focal length of a convex lens to the focal length of the same lens if it is half covered is.... a) 1:2 b) 2:1 c) 1:1 1:4 (vi) Assertion: Aladder is more likely to slip, when you are high up on it, than when you just begin to climb. Reason: High up on a ladder, the moment is larger than the moment when you just start climbing up. a Both, the Statement and the Reason are correct and the Reason is the correct explanation for the Statement. b) Both, the Statement and the Reason are correct and the Reason is not the correct explanation for the Statement. c) Statement is correct but the Reason is incorrect. d) Both, the Statement and the Reason are incorrect (vii) The vibration ofa constant amplitude without an external force is called a) Forced vibration b) Natural vibration c) Damped vibration d) Resonant vibration Page 2 of 12 (V1) A long stretched wire is made to vibrate in two different modes as shown in ngure. The ratio of the frequency of the modes of vibrations (a):(b) is.... a) b) 2:1 c) 1:4 d) 4:1 1:2 (ix) A wooden bar is pivoted at its centre so that it can rotate freely. Two equal forces F are applied to the bar. Inwhich diagram is the turning effect the greatest? -phvot -prvot C -pivat a) B b) A c) D d) (x) Astudent uses a length of wire as a resistor. He makes the second resistor from the same material. To be certain of making a second resistor of higher resistance, he should use a piece of wire that is: a shorter and thinner b) longer and thinner c) shorter and thicker d) longer and thicker Page 3 of 12 (Xi) Name the colour connected to the code of the wire which is metallic body ofan appliance. a) red b) green c) black d) brown the poles of anelectromag (A) Arectangular current-carrying coil is pivoted between exertedc Which action does not, on its own. increase the size of the turning effect coil? a b) c) d) increasing the current in the coils of the electromagnet increasing the current in the rectangular coil reversing the current in the electromagnet increasing the number of turns on the rectangular coil (xii) Amass of 0.20 kg of asubstance is initially solid. It is heated at asteady rate of 500W. The graph shows how the temperature of the substance changes with time. What is the specific latent heat of fusion of the substance? temperature 100 b) 20,000 J/kg 30000 J/kg c) 5,00,000 J/kg d) 7,50,000 J/kg a) 300 time/s (xiv) Name the radiations that are used for photography at night. a infrared radiations b) ultraviolet radiations c) Gamma ray d) Radio wave Page 4 of 12 (xv) Ifthe a) magnitheflens ication produced by alens is b) concave is -0.5, the correct statement is the image is virtual the image is magnified the image is real c) d) Question 2 (a) (b) (c) What is the principle of a machine? Which of the radiations a, Band y is similar to a beam of electrons?(1] Does the emission of the above-mentioned radiation result in a [1] change in the mass number? (ii) A uniform metre rule is balanced at its centre O. <------40cmn ------- (a) (b) 2] O<----20 cm -- Wi Is Wj>W or W1 <W ? Justify your answer. W (ii) Auniform lever of a length l mis shown in the diagram. (2] E J< ----20 cm (iv) (a) (b) Is it a force multiplier or a speed multiplier? Findthe mechanical advantage of a lever. (a) Name the phenomenon involved in tuning a radio set to a particular station. Define the phenomenon mentioned in part (a). (b) (v) Calculate the value of the resistance which must be connected to a 15 ) resistance to provide an effective resistance of 602. Page 5 of 12 (21 (2] (21 from freelyfalling body a kinetic energyof and youdrawat conclusion (vi)A graph of potential energy the Whatis in the figure. shown is 'h' aheight point A and dotted line EB? KE. Energy A PE. heo beight (vi) How fast should a man weighing 600N run so that his kinetic energy is 750 J? 2] (Take g=10 m/s') Question 3 i) Give two advantages of the ring system. (ii) A bucket ontains 8 kg of water at 25 C. 2 kg of water at 80 C is poured (2) into it. Nelecting the heat absorbed by the bucket, calculate the final temperature of the water. (ii) State one advantage and one disadvantage ofa nuclear energy. I21 (iv) The diagram below shows an object AB kept in front of a lens. The path of (2] one ray coming from the object is shown. -(a) (b) Name the lens. In which optical instrument is this kind of image formed? Page 6 of 12 (v) The given figure shows an electromagnet. A (a) (2] B What will be the polarity at the end A? Suggesta way by which the strength of the () to in the question, may be increased. electromagnet referred SECTION B Attempt any four questions from this section. Question 4 ) (a) (b) Name the phenomenon responsible for the formation of this image. (1] Complete the path of the ray through the glass prism. (C= 42 ) A 90 60 60 Page 7 of 12 (2] height of water (u-4/3) Acoin lies at the bottom of a trough in which the much it seems to be is 15 cm. Find the apparcnt depth ofthe coin and how (ii) [3) raised from the bottom. (ii) The given figure shows the path of aray of light through a rectangular glass block placed in a liquid of uniform density. (a) (b) (c) Does the light speeds up or slow down in glass? Give reason for your answer. Draw a ray diagram if it is kept in another liquid of R.I. greater than the density of a glass. [1] [2] Question 5 () A lens forms an image 16.0 m long of an object 4.0 m long kept at a distance 6 cm from the lens. The object and the image are on the same side of lens. (a) What is the nature of image? (b) (i ) Find the position of the image. [1] [2] Complete the diagram to show refracted and emergent ray for the isosceles [3] right angled prism. Critical angle for yellow colour at glass air interface is 45 . Red+Blue+Yellow Page &of 12 (i) (a) Draw alabelled diagram if an object is kept in front of aconcave 21 lens at a distance equal to its focal length. (b) In the adjoining diagram, AC =2.5 cm, BD =2.lcm. Calculate the (21 refractive index of the liquid. Cf A Air Liquid B...D Question 6 () Aman standing 25 m away from a wall produces a sound and receives the [3] reflected sound. (a) Calculate the time after which he receives the reflected sound if the speed of sound in air is 350 m/s. (b) Will the man be able to hear a distinct echo? (ii) A nucleus X emits an alpha particle followed by y emission; thereafter it (3] emits two particles to form X3. Copy and complete the values of Aand Z. (ii) In the given diagram pendulum Ais set into a mode of vibrations. A (a) (b) (c) (a) Name the type of vibrations taking place in pendulum B and D. What is the state of pendulum C? State the reason for the type of vibration in pendulum B and C. Define the phenomenon producing vibrations in B and D. Page 9 of 12 [4] Question 7 the correct connection of ) Copy and complete the diagram showing obtain maximum V.R. the tackle, the dircction of the forces involved to with convenient direction. LO D Calculate the M.A. of this pulley system if its (i) Two steering wheels of radius 20 cm are (a) (b) (iiXa) efficiency is 80%. shown in the figure. If the moment needed to rotate both the steering wheels is the same, [1] in which case force applied by the right hand is the least? Find the total moment if the force applied by the left hand (fig. 1)is 15 N. [2] A truck driver can load oil drums into the back of the truck by pushing 2] them up a sloping plank, or by lifting them directly. Each drum has a mass of 80 kg, the plank is 3m long and the back of the truck is 0.8 m above the ground. What is the increase in the potential energy, when the oil drum is lifted directly without the plank? (Take g= 10 m/s) (b) Why a ship loaded with light goods is more liable to be over turned than (21 the one loaded with heavy goods? Page 10 of 12 Question 8 (i) The diagram below shows a dual control switch. Bulb -B A | (a) Copy the diagram and complete it so that the bulb is switched on. (b) Out of A and B, which one is the live wire and which one is the neutral (2) wire? ( ) (a) (b) Which nuclear process is used in nuclear power plant; nuclear fission or muclear fusion? Give reason. becomes When ana particle takes two electrons, it becomes neutral and name of this an atom of an element which is a rare gas. What is the [1] rare gas? (iii) The following figure shows a circuit. When the circuit is switched on, the ammeter reading is 0.5 A. Find R and calculate the potential drop across the resistance R. (a) (b) Calculate the power dissipated in R. 6V A Page 11 of 12 [3] Question 9 3) 0.75 kg of ice at 0 C in a () Anclectric heater of power 150 Wis immersed in container of negligible heat capacity. The temperature remains constant for 27.5 nminutes and then rises to 40 C in a further 14 minutes. Calculate the specific latent heat of ice. (i) (a) (b) (c) What property of water makes it an effective coolant? Define the property mentioned in (a) Name any two factors which affect the property mentioned in (a). (i) In a setup as shown below, iron filings kept on a cardboard were seen to arrange themselves in a concentric pattern and the magnetic compass showed a deflection every time the key was switched on. Variable resistance P Magnetic compass K (a) What can be concluded from this? (b) What would you predict would happen if the current were increased? (c) What would you predict would happen if the direction of the current were reversed? (d) How can the direction of the magnetic field be determined without a compass? Page 12 of 12 [1] [1] 141

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