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ICSE Class X Mid-term 2024 : Physics

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Sankarshan Manna
Central Modern School (CMS), Baranagar, Kolkata
12 science

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Calcutta Bops' Sthool Class: 10 Physics (2 Hours) Full Marks 80 Answers to this Paper must he written on the answer booklet providkd separates You will not be allowed to write during the first 15 mites preparing your wGrk This time is to be spent in reading the paper and for writing the arseers allowed is the time Paper of this head the at given time Ihe in bracketsI or parts of the guestions are grver The intended marks for the questions SECTION A [40 Marks] Answer ALL Questions [15] fllowing questions: (3 1.Choose the correct option in the of forces from the axis. The moment cm 40 of distance applied at i) The force of 20Nis a) 8 Nm b) 800 Nm c) 0.5 Nm d) 50 Nm ) is not a uniform Which of the following arcular motion? around the sun a) Motion of earth aircular track racing car on a a of Motion b) around the nudeus Motion of electrons c) these d) None of " the a load along ii) A boy pulls against force The work done horizontal surface as shown. of friction is a) Zero b) Infinite c) Positive d) Negative moving with equal are m, and of masses m; iv) Two bodies of What s the ratio kinetc energy. momentum? a) m;:m; b) vm,:vm; c) Vm;:vm: above d) None of the Page I of6 their than dsplacenent of effort, then vety tatnr, more lod r, of dnplarernent vhich in mahie )A a) less than 1 b) zero ) cqual to1 d) greater than 1 vi) Asingle movable pulley is used to: a) Multiply force b) Multiply speed c) To hange the direction of effort d) Both a and c vI) The velocity of light in diamond is 121,000 krn/s, vhat is its refractive index? a) 1.33 b) 2.48 c) 1.5 d) 3.6 vi) X is an optical illusion observed in deserts or over hot estended surfaces like a coal-tarred road, due to which a traveller sees a shimmering pond of water some distance ahead of him and in which the surround1ng objects like trees appear inverted. Identify X. a) Mirage b) Mileage ) Optical activity d) Total internal reflection ix) Assertion (A): The focal length of the lens does not change when red light is replaced by blue light Reason (R): Focal length of the lens depends on the refractive index of material of the lens. a) Both A and R are true b) Both A and R are false c) A is false butRis true d) A is true but R is false. x) Alens of power 6 Dis put in contact with a lens of power -4 D. The combination will behave like a: a) Divergent lens of focal length 25 cm b) Convergent lens of focal length 50 cm c) Divergent lens of focal length 20 cm d) Convergent lens of focal length 100 cm Which of the following is correct? AlAyellow> Agreen blue b) Ageflow > Agreen> A c) Ayellow>Aolue>Agreen d) Agreen>Ablue >Ayellow mercury in it shows on the bulb of a thermometer due to which device proper a by focused is X radiation A xi) a rapid increase. The radiation X is: a) Infrared radiation b) Visible light ) Ultraviolet radiation d) X-rays graph is given below is xii) The resistance whose V-I 20 10 (6) of resistance Ris: made using four resistors %each be can which resistance xiv) The maximum a) 2R b) 1 R c) 2.5 R 220 V, then and 60 W respectively operating W 40 of filament the of resistance xv). If R, and R, be the a) R, < R d) 8 R b) R < R c) R = R d) R, 2 R Question 2 4 (1x6=6) i. Fill in the blanks. of forces. is always produced by a pair a) equilibrium. earth is an example of b) Moon revolving around the lever. example of class c) A short handle oar is an refracted ray in the prism becomes d) At the angle of minimum deviation, the and magnified image of the object. lens forms a virtual, upright e) of 4)A carbon arc lamp is an example of a source Page 3 of 6 CBS- Term Examination 2024 radiations. to the base of the prism. )ate the laws ot ehatu Ge an exayle of a on omic ondctor i) Wat ae nahm c t tos Question 3 cale dvde Q3)4differvst weghts P o, Rand scn be talnced by shifting the fuloum on a metre nto S exuual /uts as shown below. Q P (R (Q) R a. Where (at psitkon A, B,Cor D) nmust the fulrum be, to balance Pand S? A. B. C. D. 1 1 P S b. WhKh of the 2 weights shown in the fiqure would produce a negative moment of force? (2) . State the enerqy convesions in the following cases: a. Burning of a match sick b. A washing machine (2) M. To which classes of levers do the folowing bekong? a. A foot treadle. b. Acdaw hammer removing a nail. (2) Iv. A postage stanp placed under a glass, appears raised by 8 mm. If refractive index of glass is 1.5, cakculate the actual thickness of the glass slab. v. Name the type of lens used in spectacles fora short-sighted person. State 2 characteristics of the (2) imaqe formed. Vi. Why does the sun appear red at sunrise and sunset? vil. A wire of resistance 'R' is stretched such that its diameter (2) (2) becomes half of its oriqinal diameter. What would be the new resistance of the wire? (Question 4 (3) Section B (Answer any 4 Questions) (3+3+4) ) What do you understand by the term 'scattering of light'? Which colour of white light is scattered the least and why? ) With reterence to the direction of action, how does a centripetal force differ from a centrifugal force during uniform citcular motion? Is centrifugal force the force of reaction of centripetal force? Give a reason for your answer. CBSTern Exunination 024 Pape 4ofG [2 (2] .oiform meter rule is in equilibrium as shown in the diagram: 5 cm 30 cm 100cm 0 cm 40 gf a) Calculate the weight of the meter rule. weight is shifted to to keep the ruler in equilibrium when 40 gf b) Which of the following options is correct 0cm mark? OR F shifted towards 0 cm Fshifted towards 100 cm? c) State the principle of moments in equilibrium. (3+3+4) Question 5 6 gravity from point Aat a height of Sm under freely falling 400g, mass a ball of i. The given diagram shows midpoint of AC ignore air above the ground (point C). Point B is the point B? (Take g = 10ms and at energy mechanical total What is the a. resistance.) describe its journey from A to C best to graph height Draw a kinetic energy vs. b. power. to differences between energy and three must be switched on, so as 80% Write efficiency ii,. and of 10 HP for which a motor pump iii. Calculate the time 30 m. through a vertical height of water of m' pump 20 HP = 750 W] kgm, g = 10ms, 1 [Density of water= 1000 ouestion 6 load illustrates the length of the graph following iThe D and E. of levers A, B, C, y-axis, m] (n Arm Etort a. b. C. arm on the x-axis and length (3+3+4) the of the effort arm on mechanical advantage? maximum Which of these has the does C belong? To which class of lever could be its purpose? What Load Arm (in m) placed in a nut cracker of is walnut the If kgf. force of 36 required to crack broken by applying a direct be can walnut the minimum force (a) calculate ii. A pivot, placed 2 cm from the Crack. length 18 cm and the nut is velocity ratio of the nut efficiency is the nut and (b) if the 75%, find the Page 5 of6 a convenient direction). Draw a . A pulley systen consisting of 4 pulleys has velocity tato 4 (ith effort in tension in the string. If the effort labeled diagram of the system indicating the diretions of load. effort and end moves a distance of 60cm, what distance does the load move? (3+3+4) Question7 )Mention 3factors affeting the lateral displacement in a retangular glass block. ) a. Define total internal reflection. b. Complete the path of the ray of light till it emerges from the prism. ii. a) Explain why a piece of diamond sparkles when viewed from certain directions. b) Mention 2 conditions for total internal reflection to take place. Question 8 (3+3+4) i) Calculate the distance at which an object must be placed in front of a convex lens of focal length 12cm to obtain an image 3 times the size of the object on a screen. i) How does the focal length of a glass convex lens change when it is: a. immersed in water b. immersed in a liquid denser than glass C. painted black in the upper half. ) Draw the ray diagram of the image formed by a convex lens when the object is placed between the focus and optical centre. Write 2 characteristics of the image formed. Give one use of the lens in the above case. Question 9. (o (3+3+4) ) a) What is voltage drop of a cell? b) Why is it called so? Explain. ) If the distance between the electrodes in a cell is decreased, how will the voltage drop change? Explain. 1) An electric heater is rated 4 kW, 220 V. Calculate: a) energy consumed in 2 hrs b) Total cost if 1kWh is charged at Rs. 0.50. in) Three resistances 1, 2nand 30 are connected to acell of emf 2V and internal resistance of 0.5 2 2 2 3 a) Calculate the total external resistance of the circuit. What is the reading of the ammeter? Find the current through 3 2 resistor. 0.5 a 2V Page 6 of 6 CBS-Term Examination 2024

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