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ST. THOMAS SCHOOL, DHURWA, ANNUAL EXAMINATION (2022-23)RANCHI-4 CLASS:X Time: SUBJECT: PHYSICS 2 Hrs. The time given at the head of this M.M.:80 paper is the time allowed for writing the answers. Attempt all questions from Section-Aand four any questionsfrom Section-B. The intended marks for questions or parts of questionsare given in brackets () SECTION A (Attempt all questions Question1 Choose the correct answer tothe (i) The turning effect a questions from the given options forceon of from this Section) (a) the magnitude of the force a applied. (b)the perpendieulardistance of line of motion from the (c)both (a) and 15 body depends on axis ofrotation (b) (d) none of the above (ii) For work done 0 (a) (iii) In an (a) (iv) (b) electrical mechanical 300 (V) An 92. 145 object maximum in a denser in to neutrons in 238, 92 23 Uis: (c) 92, 146 medium when viewed (b) violet light (C) yellow light (d) green from (d) 146. a rarer medium light is ray diagrams tet correct ? F a) should be (d) chemical to heat (a) red light following displacement electrical for. Which of the and energyis fromn (b) chemical electrical (b) force (d) 90 while in use, the change cell to between the angle (c)45 The number ofprotons and (a) (vi) be maximunm, the to magnetic electrical (c) to b) 92 appears to be raised. The shift is F Vi) When a tuning fork is sounded in air, the sound given by it is feeble. But when top,the sound becomes much louder. The reason is: (a) amplitude of the wave (b) its prongs start (c) presence of vibrating rapidly surroundingbodies (d) large surface area of table (vii)The condition for reflection of sound (a) surface must be (b) surfacemust be body is smooth (c) polished reflecting surface must be (d) reflecting surface (ix) The following vibrating wave figures bigger than the must be smaller wavelength of the sound wave wavelength of the sound wave than the show V-I graphs.Select the graph(s)for ohmic resistors ) (ii) (ii) (iv) (a)only (i) (b)only (ii) (c)both (ii) and (iv) (d)both (i) and (ii) it is placed on a ain fuse is )Themai always connected ive wire (a) in (C) both thelive wire and earth wire (xi) On the reversing direction (a) gets reversed in (c) decreases in of current direction (b)neutral wire (d)both the earth in awire,the magnetic field (b)increases strength wire and in neutral wire produced by it: strength (d)first increases P and Q of in strength and then different same amount of metals decreases heat.Their having their masses in (xii)Two blocks temperaturesrise by the same capacities: v3 (a) (xiii)The (b) temperature (a) average 9:4 (c) of a substance on potential energy b) 2:3 (d) intensity of refracted light (a) greaterthan is always (c)less than internal reflection to take separating less same the intensity of incident (a)light ray passes from a rarer to denser medium. (b)light ray is incidentnormally on the (c)angle of incidence is (d)none of the above. 3:2 increases (b)equal to (xv)The condition required for total 3:2are given the amount. Ratio of their specific heat heating rises because ofmolecules average kineticenergy of molecules increases (c) average kinetic energy ofmolecules decreases (d) average potential energy of molecules remains the (xiv) The the ratio than critical light. (d)none of the above place is medium. angle. ) Question2 How many strands are supporting the load (a) where the effort Name the (c) in case of block and a downward direction? used for bombardment in nuclear is in particle fission tackle system of 4 pulleys Arrange the nuclear radiations in ascending order of their biological damage. nut is opened by a wrench of length 10 cm. Ifthe minimum forcerequired is 2N, calculate the moment of force needed to turn the nut in S.I. units. (i) (a)A (b) (ii) (iv) 3 of uranium-235. A uniform metre rule rests horizontally 2 on of 10 g is suspended from one end. What Statethe condition for equilibrium. is a knife the edge at the The given figure shows two forces each of magnitude 10N acting Point A and B at a separation at of 60cm in opposite direction. Calculate the resultant moment ofthetwo forces about the point (A, 60 cm mark, when a mass mass ? F-10N 12 B B and (b) 121 F-10N 3 60 cm to power of anengine required 10 ms] (v) Calculate the (vi) [Takeg= between State two differences Question ) (a) an The earthing of the part (b) Name Write faraday's iv) How much is all its lens having both A water, Given: emt and terminal of a 121 cell 121 (b)A focal lengths equal. is uselul only appliance electric of the appliancewhich ray passing undeviated if the fuse is through the lens. 2 2 in the live wire. Give reason. is earthed. induction. law of electro magnetic 1s needed to melt water at 100 C is at sources 0C. of water heat capacity 2 Kg of ice so that the mixture, which 12 = 4.2 Jg 'K,specific latent heat of ice is 336 Jg 21 rays. of Ultraviolet SECTIONB (Attempt any (i) voltage boiling Specific (Givetwo Question 121 for each of the following: (a) (ii) the deep. 21 3 State the condition t 560m 1000 kg of coal per hour from a mine forced and resonant vibrations between two differences (vii) State lift 4: a shows The diagram alongsidean normally on four questions from this Section) 60 beam of light (Red +Green) If the equilateral prism. for the light of of path of light triangular Red+Green is 60 the material of prism angle for the the diagram showing 13 red colour, complete the angles in the Mark out of the prism. each colour emerging wherever necessary. diagram of a glass trough containing at the bottom is coin placed cm. At what a suitable (ii) to a height 20 index 4/3) up above the coin. Draw (refractive almost water vertically from air, when it is viewed will it appear depth of your answer, C in support ray diagram B P 141 shows a light source embedded alongside 42 ii) diagram ABCD ofcritical angle incident critical A = 3 42 A block in a rectangular glass at surface What (a) is the angleofincidence occurs at surface Which phenomenon of refraction is the angle (c) What (b) (d) the Draw a diagram showing Question 5 at placed (a) What is the nature 0) An object is BC? at surface final path BC CD ? of the ray of light. in front of aconvex a distance 24 cm so formed? ofthe image lens of focal length 10 cm. 131 the distance (hCalculate of the image from thee lens. (clls or smaller than the size of the image bigger the object ? i) A beam consisting is of red, blue and yellow colours on the face AB of an incident normally ABC as shown isosceles right angled prism below. Critical figure given colour interface for yellow the in Red Blue+ Yellow angle of glass-air is 45. Out of the Q R: emergent rays P, and red colour? (a) Which one is ofthe the blue coiour? (b)Which one is of three (c) Which one is C B of the yellow colour ? shows a convex lens L, a diagram adjacent The (ii) source of light S. Rays a planemirror M and point of oflight from the source origin. S return to their the ray diagram to show of plane is the purpose point this. (a)Complete (b) What mirror (c) S M? What is the effect of moving the mirror M towards the lens L on the return of rays of light ? M [4 Question6 () (a)In the given figure drawa tackle to lift the load by applying the force in [31 adownward direction. (b)Mark the direction of load L and effort E (c) State the number of strands of tackle in the figure. supporting the load. The adjacent diagram shows (ii) a steering isrotatedclockwiseoyooque 10 Nm and oppositeforce F. (al Calculate the magnitude of force produced due to a pair equal point of application. tiil A block of mass 30 kg is pulled up a slope as shown thefigure with a constant speed by applying a force 200 N parallel to the slope from the initial A position the of F. (bi Show them on the diagram with their final position (3 wheel of radius 0.25 m which in of to B. (a)Calculate the work done by the forcein moving block from A to B. the 200 N (b) Calculate the potential energY gained by Take :g= 10 ms (c) Account for the difference in answers 1.5m the block. of parts 2.0m (a) and (b). Question (i) 14 7 A person standing at a distance x in front of a cliff tires a gun. Another person B standing behind of the fired shot after 2s and 3s the person A at distance y from the cliff hears two sounds respectively. Calculate i) Complete the following nuclear a) P+He c) 11 Na reactions and them: rewrite p b) three modes of vibrations of a lm 1m 1m P (i) (iii) Which of the abovediagrams shows the (b) If the frequency of the note produced ii). is the note loudest? long stretched string 1m (a) In which case R+ Mgt (i) The diagrams givenbelow show (c) 13 x and y. (Take speed of sound= 320 ms"). in fundamental (i) is f, Give reason. mode ? write down the frequency in cases (ii) and 14 Ouestad (a)Two resistors Ri= Q of resistance 2 and are connected in current source of A. Draw the parallel with a in R2. arrangement and deduce the current I in Ri and l (b)What do you mean by earthing of an electric appliance? The given figure shows a radioactivesource S in a thick lead walled container having a narrow opening. The radiations pass through an electric field between the plates A and B. 3 R21Q 31 (i) (a)Complete and y the diagram to show the paths of a, B radiations. (b)Why is the source container with (ii) The S kept in a thick a narrow lead walled opening? 13 circuit diagram in the given threeresistors,2 2, 4 0 and RQ figure shows connected to a battery of e.m.f.2 V and internal resistance 3 2. If main current of 0.25 A flows through the find (b) (c) AAA 4Q -w LAAAA circuit, RQ the p.d. across the 4 Q (a) 2Q resistoor. the p.d. across the internal the p.d. across the R Q or resistance 2N 0.25A of resistor value of R. the 2V cell. and the 3Q 4) Question9 200 g of waterat 50.5 Cis cooled down to 10"C by adding'm'g of ice cubes at Find m. Take in specific heat capacity of water 4.2 and specific latent heat of Jg ice 336Jg = ii) (a) (b) 0C C Explainthe following: The farmers their fields with water to save the crop on a very cold night. The heat supplied to a substance during its change of statedoes not cause any rise in its it. 3 fill 3 temperature. (iii) The diagram in figure alongside shows a fixed of severalturns connected to a centre zero galvanometer G and a magnet NS which can coil move in a direction (a)Describe shown the COIL Direction in the diagram. observation in ND the galvanometer if (i) the magnet is moved rapidly, (ii) the magnet is kept stationary after it has moved into the coil, (iii) the magnet is then rapidly pulled out of the of motion O000 Magnet G coil. (6)How would the observation in (i) of part (a) change if a more powerful magnet is used? 141 7
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