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ICSE Class X Prelims 2025 : Physics (St. Paul’s School, Rampurhat, Birbhum)

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p S Che ST.PAUL'S SCHO0L RAMPURHAT PRE-BOARD EXAMINATION 2024-25 CLASS- X F.M- 80 Marks SUB- Physics TIME- 2 Hr. Answers to this Paper must be written on the paper provided separately. Youwill not be allowed to write during first 1S minutes. This time is to be spent inreading thequestion paper. The time given at the head of this Paper is the time allowed for writing the answers. Section A' is compuisory,Attempt anvjour'questions from Section B. The.intended. marks for questions or paris ef questions are given in trackets 1). SECTION-T|40 marksl (Attempt all question from this section) Question n0. 1 (write the correct option with answer) 1. Which particBe is used to bombard 13A| to give 1sPl and a neutron? 1 d) neutron uparticle b)deuteron c)proton 2. Which is used in cure of cancer and detecting brain tunor? a) sodium-24 b} iron-59 d) none of these c) cobalt-60 3. The specifie heat capacity of water is 4200 j/kg 'C. Calculate the heat capacity of 10 kg of water per 4 C. d) 420 kJ y42kJ 4. Ssertion (A): The magnitude of induced e.m.f becomes maximum when the magnetie flux liuked + a)42J b) )420J with the coil reduces to zero from its maximum vaBue. Reason(R):This happenswhen the pBane of the coii lies in the direction of the magnetic field. w ) both A& R are correct b) both A & R are false. c) A is faise but R is true d} A is true but R is talse. 3. fR1 und R2 be the resistan e of the ilament of 40 W and 60 W respectively operating 220 V, then { c) R = R2 a) Ri < R d) R1 R2 bR: < RI 6.)Assertion (A):Water is slightBy cooler at the bottom of the waterfall than at the top. Reason(R): whenever mechanical energy changes to other forms, it is always in the form of kinetic energy and not in the form cf potential energy. b) both A& R are false. a) both A &Rare correct c) A isfalse butR is true dA is true but R is faise. 7. A Current of 2 A is passed through a coilof resistance 75 Q for 2 minute. The potential difference il! c) 9 V t 150V. a) 300 b) 75 V 8)A cook uses a fire tong of length 35 cm to lift a piece of burning coalof mass 200g. if he applies his Tfort at a distance of 7 em from the fulcrum, then the efforts in S.l units is LY10 N b) 20 N c) 40 N d) 60 N (9Apersonstanding vertically upon histoes is an example of lever of a) first order b) second order c) third order d) it is not acting as a lever. T,Assertion (A): Just before setting, the sun may appear to be elliptical. This happens due to X refraction. Reason(R): refraction of light ray through the atmosphere may cause different magnification in mutually perpendicular directions. ) both A & R are correct b) both A & R are false. c)A is false but R is true 4YA is true but Ris false. 41. Anonjcet in a denser medium when viewed from a rarer medium appears to be raised. The shift is maxinEm fer ared iigh! b) vioiet iigny cj yeiew iight )green aight. 12. The lens is placed in water its focal l ngth. a) decrease b) equa> d) remain same. inerease 13. A thick glass slab with asilvered side forms multiple images on account of a)reflection c) refraction dbothreflection and refraction. b) dispersion 14/ The specific heat capacity is maximum for a) copper b) a zinc iron t 15 ASsertion (A): The specific heat capacity ofa kubstoncis the of heat required to raise its 13. temperature by 1 0C, [1] Reason(R): The specific heat capacity of a substance is not its characteristic property. a) both A & R are correct b) both A & R are false. c) A is false but R is tru dyA is true but R is false.: Question no 2:. i) The cause of-fatent heat is (kinetic energy / potentialenergy ).X ii) One horse pewer is equal to (764 W I746 W). 0)A seissoris a: multiplier. (speed / force) [1] iv) Atota> reflecting right angled isosceles prism can be used to deviate a ray of light through (60 /90). v) Colour of earth wire is (light blue / green) Question no 3. i)A piece of ice of mass 60 g is dropped into 140 g of water at 50 C. Calculate the final temperature of water when allthe ice has melted. (Assume no heat is lost to the surrounding) Specific heat capacity of water = 4.2 Jg'k Specific latent heat of fusion of ice =336 Jg. ii)The diagram below shows the change of phases of a substance on a temperature vs time graph on heating the substance at a constant rate. lemp. C B VA time(s) (a) Why is the slope of CD less than sBope of AB? (b) What is the boiling and melting point of the (2+1+1| substance? Hi) Howwould the sky appear when seen from the space? Givereason for your answer. Question n0 4. i)How pulley systems work, as aforce multiplier or as a speed multiplier? Mathematically prove your answer. i) Inthe refraction through glass prism how angle of incidence angle of emergence ,angle of prism and angle of deviation related ? Prove it mathematically. iii) Abullet of mass 5 g travels with a speed of 500 m/s. If it penetrates a fixed target which offers a constant resistive force of 1000 N to the motion of the bullet, find: (a) the initialkinetic energy of the bullet, (b) the distance through which the bullet has penetrated before coming to rest, and (c) the speed with which the bullet emerges out of the target if target is of thickness 0.5 nm. SECTION-H |40 marks] {Atiempt 4ny four yuestivas frem this sevtion) )Aleos IS Used in spectacles for the short sighted nerson, (a) Name the mention lens(b) where should be the object kept for this condition, (c) Draw the ray diagram for this type (d) give one application of that |1+1+2+1| [2] type of lens. ii) What.are the factors on which focal length of a lens depend. ii) Where should an object be placed in front of a convex leris of focal length 0.12 m to obtain a real image of size three times the size of theobject, on the screcn? [3) Question no 6. i) Aperson standing at adistance Xin front of a clitf fires agun. Another person Bstanding behind the person A.at distance Yfrom the eliff hears two sounds of the fired shot after 2s and 3s respectively. o Calculate X andY(take speed of sound 320 m/s) |3] ii) What are the damped vibrations? How do they differ from the free vibrations? Give one example of [2+2| each. [2+1} iii)State the term resistivity with S.I unity , uestion no 7, i) Draw a neat labeled diagram of a d.c. motor. What are the function of split ring commutator? [2+1| ii) Draw alabelled diagram of a device you would use to transform 200 V a.c to 15 V a.c. Name the device |1+1+1] and explain how does it work. Give its two uses. (2] (21 ii) Why does the deflection of Bparticle is more than a particle? iv) What do you mean by background radiation? Ouestion no 8. i) What is mirror isobar? Give an example. ii) Why radioactivity decay is a random phenomenon? iii)The input and output voltage ofa transformer are 220 V and 44 V respectively. Find (a) the turns ratio, (b) the current in input circuit if the output current is 2 A. iv) A pump is used to lift 500 kg of water from a depth of 80 m in 10 s. Calculate (a) the work done by the pump. (b) the power at which the pump works, and (c) the power rating of the pump if its efficiency is 40 %. (take g= 10 m/s). Ouestion no 9. ) Draw ant labeled ray diagram to show the total internalreflection of aray of light normally incident 3] on one face of a 30 ,90", 60" prism. ii) A cell of emf2 Vand internal resistanee 1.2Qis connected to an ammeter of resistance 0.8 2 and two resistors of 4.5 Q and 9 Qas shown in the fig. Find (a) the reading of the ammeter, (b) the potential difference across the terminals of the cell, and (c) the potential difference across the 4.5 Q resistor. 2V 1.2 Q 0.8 2 4.5 Q 9 Q (2+1+1| ii) Alens is used in a slide projector. Name the lens. Where the object kept for this condition? Draw a ray diagram for that type. |i+1+1)

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