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ICSE Class X Prelims 2025 : Physics (Smt. Lilavatibai Podar High School (LPHS), Mumbai)

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Jivaansh Yadav
Children College, Azamgarh

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LILAVATIBAI PODAR HIGH SCHOOL, ISC PRELIMINARY EXAMINATION - 2024-25 Duration :- 2 Hrs. Subject :- Physics Marks:- 80 Grade:- X Instructions :Answers to this Paper must be written on the paper provided separately. You will not be allowed to write during 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. Section A is compulsory. Attempt any four questions from Section B. The intended marks for questions or parts of questions are given in brackets [ ]. Section A [ 40 Marks 1 (Attempt ALL Questwns ) Question 1. Choose the correct option from those given below (i) Which of the factor does not affect the graVitational energy possessed by a body? b) Velocity c) Displacement against the gravity a) Mass d) Gravitational acceleration . [15] V (ii) Ram used a spanner to tighten a bolt of his scooter. Which of the following units can be used to express the torque acting on the bolt? P) Nm Q) kgm2s-2 b) only Q and S d) all - P, Q R and S a) only P (iii) S) dyn.cm R) J c} Ollly P, Q and S If the moving body has x joule of kinetic energy and its velocity is doubled then its kinetic energy becomes :c)4xJ b)8xJ a) 2x J d)OJ (iv) Which of the following statements is not true about a pulley ? a) a single fixed pulley is the one which is fixed to a support. b) a single movable pulley is not fixed to any support. c) a movable pulley doubles the effort that we exert. d) a single movable pulley acts as speed multiplier. (v) The phenomenon responsible for appearing of the sun before actual sunrise is b) Refraction of light a) Total internal reflection d) Scattering of light. c) Dispersion of light THIS PAPER HAS NINE (9) PRil'ITED PAGES. 1 (vi) Fo r a oonvex len s, the mi nimum distance between an object an d its real image in te.rms of foc al length (f) of a given len s must be a) 1.5 f b) 2.5 f c) 2 f d) 4 f (vii) Statement I : The power of a convex lens changes wh en it is placed in wa ter Statement II : Power is a characteristic property of the material used to make lenses. a) bo th statements are tru e b) Statement I is true an d Statement II is false c) Statement I is false an d statement Il is true. d) bo th the statements are false. (viii) Which of the follow ing waves is used !or propaga ting information through television ? a) Infra-red rays b) Micro waves c) Ultra vlolet rays d) radio waves of shorter wavelength. (ix) Atish turns the knob of his music system either to his left or to the right to change the volum e of the music it is p1aying . Wh ich of the following charaderlstics of sound wave remains un changed while turning the knob ? P) am pli tud e Q) freque t)CY ~ wa ve len gth S) speed a) only P an d Q b) only Q, Ra nd s$ c) on ly Ra nd S d) only P , R an d S. (x) Below sh ow n is a V - I gra ph of four conductors . W hich one is to be ch os en as a heating eleme nt in the appliances 7 V a) W (xi) I b) Z c)X d) Y A bulb is rat ed 100 W - 240 V. It is connected to a circu it of 120 V. The power consumed by it wi ll be :a) double tha n the rated va lue b) slightly more tha n the rated value c) equal to rat ed value d) less than the rated value . (xii) (xiii) b Lenz's Iaw IS ased on the law of conservation of: c) mass b) charge a) force d) energy of the statements Regarding specific heat capacity of a substance one capacity is is not correct. Identify the staten1ent. Specific heat a) is constant for a given material b) is constant for given state of matter. . c) is directly proportional to the mass of the substance of the matter. d) is greater for liquid state than for the solid state a (xiv) A substance of mass 1.5 kg is heated by heater of 100 W. It shows city capa heat temperature change of 40 C in 2 minutes~Tbespecific ~ of the substance is :1 c) 400 J kg-I K 1 b) 300 J kg- K ( a) 200 J kg-I K 1 d) 420 J kg-1 K-1 ,t (xv) in nuclear :fission is The particle used as a projectile for bom_pardment d) alph a , c) neuf1:oU , b) g ~ a) beta ~ ~ ' .. ~ '!::. -'I ... ~ Question 2. . d/ wo;d s given with the (i) Fill in the blanks with the app ro~ wor ..... .. ,;t.. _~ sentence. "' , ' . a) _ _prism is used to obtain inlrcl;,ed spectrum ..... (qua rtz/ rock salt) __ the b) ,Refractive index of gla 7with respect to-w_!lter is_ refractive index of glas~ with respect to diamond (~ss than / greatet ~n ) stance/ resistivity) c) Two copper wires can have.different._ _ (resi - _(resistance/ resistivity). but wilfhave same specific heat d) A good confiuctor of~ usually has _ _ _ capacity (low / high ) , . ase in angle of e) Lateral displacement__._ _ _ _ with incre incidence (incr ease s/ decreases). ~ ' (ii) (iii) [6] t- ples :Identify the type of work done in the following exam a) a fielder catching a cricket ball led road b) a coolie lifting a load and -walking along the level [2] . a) Name the waves used for echo dept h sounding cation. b) Give one reason for their use in the above appli [1] [1] Question 3. (i) An ohj\'ll is k~pl in Cronl of o lens, il is obs< 1rvcd that for n particular pusttion the si1.l' of objcd nnd the imJs~ is same. 'l his Is pobsiblc only wh~n tlw lcni.; is kc!)t belwcen the objccl :1nu the lt'IM. \ fl1P.~e .\) ldcnlify lhl' lrns. h) !)tnh.' the pr,,clknl ll5C of lhe situation mcnlione d above. (u) A mctol wire has a resistance of 60 O. ll is cul into three equal lengths. Find the equivalent resistance when two parts are connected in pnrallcl nnd the third part is in series with them. (iii) ln a transformer the ratio of number of turns in prim ary coil to secondary coil is 1 : 10. a) Identify the transformer. b) Define the transformer identified above. (iv) 200 g of hot water at 80 C is added to 300 g of cold water at 20 C. Calculate the final temperature of the mixture. (v) An insulated copper wire is amnected to a galvanom eter. State the changes in deflection of pointer of a galvanometer, if a) a bar magnet is pushed towards the coil. b) a bar magnet is kept stationary in the coil. (vi) A certain nucleus P (A= 238, Z a 92) is radioactiv e and becomes a nucleus Q (A:a 234 , Z 90 ) by emission of a particle. a) Identify the particle emitted. b) State the change in form of an equation. [1} (1) (2) (11 [1) (2) [1] lll [1] [1] (vii) A teacher made an electriaucircuit using some wires, battery. She mea sme d the resistance of the bulb to a bulb and a be 45 ohm and the voltage across the bulb to be 15 volts using a multi-me ter. a) What is the net current passing through the above circu it? (2) b) She connects two resistors of unknown resistance 11) in series with the bulb and measured the voltage aaoss the bulb. What is observe on the multi-meter as annpared with the she likely to earlier reading? Section B pt (Attem any 4 questions ) Question 4. (i) A studen t while performing an experiment placed an object in front of a convex lens. He covered the top half of the lens with a woode n [3] block as shown below. Con axlens Object ~ ~ I 2F Wooden block ~ I F, I I ~ Fi J a) State the characteristics of the image funned. b) State at which position will the image form with respect to the lens. c) How will the image change if the wooden block is removed? (ii) (iii) The bottom of a beaker is painted with seven circular rings filled with colour in the order of VIBGYOR and is filled with clean wat~ up to a height of 20 cm. a) Will the image of all the circular rings be at the same depth ? b ) Which colored ring will shift maximum and which colored ring will shift minim um? ABC is a glass block whose two sides, AB and BC, are at right angles to each other. A ray of light is incident on the surface AB, as shown in the diagram, and suffers total internal reflection before falling on the surface BC Finally, the li ht ra emer es out along the surface BC. [3] [4] a) What is the angle of incidence at the surface AB? b) What is the critical angle for the glass block BC? c) What would happe n to the critical angle if the tempe rature of the glass block is increased? d) If the angle of incidence is 40 at swface AB , then along which surface would the ray emerge out of the prism ? 5 Question 5 (i) An object is kept at a distan ce of 15 en, from a convex lens of foc al length 10 an . Calculate the ima ge distance and stnte U1e characteristics of the image forme d. (ii) (iii) a) For the same angle of incidence , the angle of refraction in three different mediums P, Q and Ra re 15 , 25 and 35 respectively. In which mediun1 \vil l the speed of light be minimum? b) Give scientific reason for you r answer. c) Write an expression for refract ive index of a medium in terms of wavelength of light. Two periscopes were made in a school lab , one was made using plane mirror and the other was made using a right isosceles pri sm. The students wh en observed thr ough tl)e periscopes they found that image in one of the periscopes is brighter. a) In which of the two periscopes .. mirror or prism would. the ima ge formed be brighter ? b) Name the phenomenon respon sible for,.the formation of image c) State the necessary conditions for the above phenomenon to occ ur. ' Question 6. (i) 0 40 Ai .-- --= --- -.- -b -.-~~----l80 [3] (3) [4] [3] B 100 gf ~ "' l00gf a) A uniform rod AB .qf 80 cm is balanced at 45 cm from A. If this rod is tut at point C the~ compare the weight of part AC with part BC. b) Give reason for your answerin (a) (ii) (iii) An apple of m ~ 150 g ~ from the tree at a height of 450 cm falls to the ground. a) What is the di ~~ fu the pot ential energy possessed by the apple when it is at a distance of 300 cm and 150 cm from the ground? b) Find the kinetic energy with which it hits the ground. ( acceleration due gravity (g) 10 m s-2) Draw a diagram of a pulley sys tem of velocity ratio 4. Calculate its mechanical advantage if its efficien cy is 90%. [3] [4] Ques tion 7 (i) In the diag A b l ram e ow is shown a lever. r ---- --- :1m-- ---- ---- --- 0.4m L1:11120 gf (ii) F [3] B iE a) ltlentify the class of lever. b) Calculate the value of E. Shown in the picture below is a ship using SONAR. - ------ - [3] If a submarine is located at a depth of 3~9 km from the ship, that calculate the time taken fot the signal from the SONAR to readl the submarine and return to the ship. (Note: speed of sound in water to be 1560 ms 1.) (iii) . Shyam and Ram are standing at a dlstance of 12 m and 20 m respectively from a cliff. They start shouting their names. They want to hear a clear echo of their voice. [4] 20m 12m a) Based on the infollllation given, who will : ( '.. hear a clear echo of their own voice ? Why? b ) State two more conditions for a person to hear the echo of their voice. Question 8. (i) a) Name the colour code of the wire which is connected to the metallic body of an appliance. b) Explain the meaning of the statement :" Current rating of a fuse is 5 An. [3) c) In the transmission of power, the voltage of power generated at the generating stations is stepped up from 11 kV to 132 kV before it is transmitted. Why ? (ii) (iii) a) u Mg 11 emits a beta particle and is transfor med into aluminum. Write the mass number and the atomic num ber of aluminum. b) Aluminum emits a gamma ray. What is the resulting nucleus? (3] In the diagram given below two coils X and Y are shown Xis connected to the battery S and Yis connecte d to the galvanometer. B J.---'1. C X s y [4] D K When the key is closed , state the polarity a) at the end B of coil X b) at the end C of coil Y when Y is moved tow ards the coil X. c) Name the phenomenon on which the abov e observations are made. d) State whether the deflection in galvanom eter will take place towards left or right. Question 9 (i) Study the graph given helow and answ er the questions that follows. s 200 400 600 BOO Tme (sec ond )- a) Which portion of the graph (Q R, S or T) represents the latent heat of vaporization and latent heat of freezing of the substance? b) From the graph, write down the tempera ture range at which the substance continues to be in the solid state? c) Why is length of region Q les.s than region S? [3] (i i} of 1 down 150 g J0 t1 to d e it u c e req amount o fi " C to s C CalcuJaie theeter o f mass 50 g &om 30 J g -' C" J a at:? in a calorim city o l ..-a a p a c t a e h l Specific nt he.it o r iCP 336 Jg-' J te { Specific la C elow is of a D b m a r g ia d e (i ll ) Th wm.er b!pt ltJ motor. JINll le1cl a,ld the C ed to lo w ll II allow l. Namtthtfote 11111C1:11 en the by t h e _ . wh c)Stm poladdel of the e If the length f forc [ IN l: w . o d)Statethe . i l ' l ~ . u . mndudot . Ill

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