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SMT. SUNITIDEVI SINGHANIA STD DATE 10 TERM SUBJECT Physics 16.11.24 SCHOOL, THANE(W) Duration Marks SIDES 2 hour 80 6 INSTRUCTIONS: Read the questions properly and write the answers only in the answer sheet. Number the answers correctly Omission of essentialworking willresult in loss of marks. Attempt all the questions from Section Aand any four questions from Section B. The intended marks for questions are given in brackets [ 1. SECTION A (40 Marks) T H A N (Attempt all questions from this Section.) Question 1 S C H O [15] L Choose the most appropriate answer from the options given: (Do not copy the questions, write the correct answers only.) Position of centre of gravity of a solid cone of height (a)3 cm from the vertex. (b)4 cm from the base. 63cm from the base. (d) 4 cm from the vertex. units, pivoted at The diagram below shows uniform metal l e of lengthnet12torque acting on the rule the If end. aon suspended 20 gf a with 9 units mark is in the clockwise direction, then A 20 gf (a) Weight of the sc le ess than 20 gf oWeight of the scaiJs equal to 20 gf (c) Weight of thesale is greater than 20 gf (d) Insufficiep dala todraw any conclusions. For afreyjaling body, the potential energy at the top is (a) zgo (b)girtmum SMTSU aual to maximum kinetic energy. equal to gravitational potential energy. Velocity ratio of the block and tacke system when effort is applied in convenient direction is always equal to (a) number of pulleys in the lower block.X0 -(b) total number of puleys in the system. (c) Number of segments of tackle attached to the upper block. o (d) Mechanical advantage of the system. The safe limit of current for a device having power rating 200 V, 500 Wis (b) 0.4 A (a) 11A (c) 2.5 A (d) 96.8 A vlv) If absolute refractive index of a medium is 1.8, then its critical respect to air is: (a) greater than 42 (vil) (b) equal to 42 angle of the medium wi: (c) less than 42 (d) equal to 49 The temperature ofabody increases by1C. Which other (a) heat capacity (b) internal energy quantity also increases? (c)specific heat capacity (d) specific latent heat Page 1 s E Ques 2 tion What Light travels throughaglass block as shown. Which angle is the critical angle $ light in the glass? (d) (c) air b) glass HA (N W E The optical phenomena, twinkling of stars, is due to (a) Atmospheric reflection (b) Total reflection (c) Atmospheric refraction (d) Total refraction Red light of frequency 430x 1012 Hz has a wavelength of 700 x possible for blue light? (a) afrequency of 190 x 1012 Hz and a wavelength of 450 x (b) a frequency of 190 x 1012 Hz and a wavelength of 950 10 m m (c) afrequency of 670 x 1012 Hz and a wavelength of 450 k m (d) a frequency of 670 x 1012 Hz and a wavelength of 50 10- m Two devices are connected between two points gay and B in parallel. The physical quantity that will remain the same between thedoints is: (a) current (b) voltage (c) resistance (d) None of these In refraction of white light through a prie he light ray: (a)Suffers refraction only at one facE pne prism (b) Emerges out from the prism inhrection parallel to the incident ray (c) Bends at both the surfacesosm towards its base (d) Dispersion takes place a h the refracting faces of the prism The diagram representewave. Which row in the table gives the wavelength and theN amplitude of the &y E SU SR ID VWaveiength Amplitude (a) 2 (d) 4 2 Diections: in the following questions, theAssertions (A) and Reason(s) (R) have been put SM Sorward. Read both the statements carefully and choose the corect alternative from the following: (a) Both the Assertion and the Reason are correct, and the Reason is the corect explanation of the Assertion. (b)The Assertion and the Reason are correct, but the Reason is not the corect explanation of the Assertion. (c) Our Assertion is true, but the Reason is false. (d) The statement of the Assertion is false, but the Reason is true. (Xiv) Assertion: lce at 0 C is preferred over water at 0 C in order to cool juices. Reason: lce has a great amount of kinetic energy as compared to water. (ov) Assertion: Main switch at the distribution board is a double pole switch. Reason: Dualcontrol switches are operated independently from two locations. Page 2: angle for Question2 () Whado you understand from the following statements? NMechanical advantage of amachine is greater than 2 [3] b)Fuse wire is rated 5 A (c) The specific laternt heat of fusion of ice is 336 J.g-1 Abox of mass 2 kg is carried to the top of the stairs. Calculate the work done by () [2] N (E W) the force of gravity on the box. box 0.9 m 1.2m (i) bodies. State any two factors that affect the kinetic energy of moving JNTIDEV below. [2] named Aand Bin the diagram giygbe Name and list the function of pulleys RIGID SUPPORT EKEGRAM,POKH (iv) OOL equilateral prism The diagram shows the i-d curve whtghtpasses through an of a certain glass material. (a) What is the angle of incidencefWhich the refracted ray travels parallel (v) to the base of the prism? (b) Calculate the value 21-A =Smn SmintA= i t 2 angle of S M T . ` U N S I D E V I deviation (6) S+0=l+e St6r= 2 t 66 41 (0,0) 42 i angle of 66 incidence (i) diagram to represent the second focus and focal length of a convex lens. [2) (vi) 53 graph of a material at two different temperatures T and Ta are shown in the giver diagram. Is T >T2? Justify [2] 1(0) i) ii) iv) ( Question 3 (0) (a) Name the waves used for echo depth soundinga. (b) List one characteristic of the wave that makes it useful for this purpose l e s t i 5 o n T w ro e Adouble convex lens, made of a material of refractive index u, is placed inside tm liquids of refractive indices u2 and u3 as shown. Awide, parallel beam of light is inci ba on the lens from theleft. Given that 2 PiU3, complete the path of parallel incider, rays. (ii) The graph represents a cooling curve for a substance being cooled from higher T H N E 4 temperature to a lower temperature. (a) What is the boiling point of the ) (b) If the heat is extracted from thesubstance? at the rate of 200 W, calculate body latent heat of vaporisation of the substance. 260 P 200 100 60 10 16 20 Tme ln ee0 (iv) 26 30 35 GHANIA Two bodies having in the ratio masses vertical height. Find the ratio of their dropped from the same (a) velocities (b) linear momenta. (v) (2] The rear view mirror of a speed of the motor bike Ive bike starts vibrating violently at some particular scientific reason. [2] SECTION B40 MARKS any four questions from this Auestion4 (i) (aefine moment of force. AOAmetal rod AB of length section) 100cm is at 60 cm from end Awith 25 Suspended from both ends as balanced gf shown in the figure at its centre C (50 cm [2] If the rod is cut mark), compare the weight of rod ACbelow. to 50 C 25 gf 60 that of rod BC. 100 25 gf (i) With the help of a neat, labelled diagram, show the produced when a monochromatic beam of light is incident normally ondeviation any one of the face of an equilateral prism. ( i) Find the position of the virtual image formed when an object 2 cm tall is placed 20cm from [4) (a) a converging lens of focal length 40 cm. (b) a diverging lens of focal length 40 cm. [3] Page 4 c a ide Auestion5 TWO resistors with resistance R =5 0 and R=70are connected in series acrosS a Datery of emf 18 V. Draw a circuit diagram and find the electricalenergy consumed (3] by the circuit in 30 s. (i) [1] (a) Define the term 'dispersion of light'!. (b)White light incident on a glass slab does not give rise to the spectrum. Give [21 scientific reason. (i) (a) Draw the schematic diagram indicating the position of the Load, Effort and Fulcrum of the machines indicated in the diagram given belowand classify them as forcel speed multipliers. N E Tweezers Bottle opener (b) Calculate the tension T in each of the cases () and (Il) if 120 kg loa the lower block of the system. Assume the machines to have atached to 100 ongy C H O O L , (DO NOT copy the diagrams) [2] Ne E i) T G H A N I e of Th boc All s est o () Auestion () (a) Define heat capacityoedbstance. Mention its S.l unit. (b) Mention a factor tha toes not affect the heat capacity of the substance. (i i In adam, water at a rate of 600 kg.min from a height of 150 m. (a) CalculateAe hitial PE of water [1 energyrlgilate the useful power generated. 2 (b)Assurgiat 10% of energy of falling water is converted to heat and sound (ii) on 1 [2] Ti isplacement-distance graphs for waves Aand Bare depicted as they pass Yough air. DISTANCE Giy We. iro et l yI Compare their (a) frequencies. (b) Loudness. [2] Why does the sun appear red during sunrise/sunset? Give scientific reason. ntg are e4 ahar shar VQuestion 7 g 12 (a) Define lateral displacement. (b) Mention any two ways to decrease the lateral displacement produced by monochromatic light. (i) ( ) An electric immersion rod is switched on for 5 min. (ii) Afish is looking at a 20 cm high plant at the edge of the pond. [1] (21) The heat supplied by it raises the temperature of 1 kg of water from 30 C to 90 C. [21 (a) Calculate the power of the heater. (b) State the assumption used in order to calculate your answer in part (a). (a) Willthe plant appear shorter or taller than its actual height, to the fish? Dray ra T H N I diagram to support your answer. (b) Calculate the apparent shift in position if the refractive index of water js (2) Question 8 Observe the circuit diagram and answer the questions that folw () [3] 32 W 42 22 6v K, (a) What is the reading of the ammetewhen key K is closed. (b) What happens to the reading o he ammeter in part (a) when both K, and K2are closed? (Increasesldecreas s/remain the same) (c) What is the magnitude,d coent through the 3 Qresistor? (ii) Two tubelights 40 W ea k, ofans of 150 Weach and four bulbs of 50 Weach operate c an average of 10 h a dapthe cost of electrical energy is 4.50 per kWh, calculate the monthly bill. (ii) (a) Name therion whose wavelength is 200 nm (b) Mention any ohe application of the radiation identified in part (a). (c) List ay oadvantages of MCB over fuse. o-3) [1] [1] (2; Question 9, () a ray diagram to show the application of convex lens in a slide projector. (3 rays) (3] Inthe given three-pin socket, (a) ldentify and write Live (L), Neutral (N)and Earth (E) against the [3) correct number. connected? (b) To which part of the applianice is terminal 1 connected? (c) To which wire joined to 1, 2 or 3 is the fuse (ii) (1] (a)Define an echo. cliff. vertical froma m 5500 of distance (b) An observer Xis on an island shore at a island. A blast from the ship is heard the and cliff the between anchored is Y A ship the first and the second sound. If the twice by X, the interval being 5 s between distance between the velocity of sound in air is 330 m.s-1, calculate the [3] ship and the cliff. Page 6 1e.
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