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0 The, , , , i ‘Weteeiea, ?, , Question 1, , , , , , , , , , , , , , , , , , , , , , , , of light, vapect to Refraction , Y 4, Choose the correct statement ead deviate from its original path { medium is le a f, a. ca the normal when density of secone ., t ray bends away from the ne rd, “+ medium to another dense, med t enters from one optical rarer me div 4), Speed of light decreases when it € ;, u crease in wavelength of light wave, ; vabe ends towards the normal ther 5, & Allof the above from one optical medium to another and bends towa, When a light ray enters from one ¢, se of refraction, 1. Angle of incidence is less than angle fF im to optically rarer medium, area ediu e —: > from optically denser mec eee z, optically rarer medium to a optically denser me ), \ AIR, Glass slab Q, &, 0), 1. ray AB 2. rayBA 3. segment AB 4. segment BA s, (d) Identify the lens which exhibits the following characterstics of image virtual, erect and diminished, Si, 1. Convex lens 2. Concave lens, 3. Plano convex lens 4. Concavo convex lens, ’ : 7 ; +, (e) Acoin is dropped in a glass through containing benzene filled to a depth of dem. When viewed frow 75, outside it appears to be raised by 2cm. The refractive index of benzene with respect to air is calav sh :, as: Z, 1, dividing real depth by shift that is [4/2}= 2, 2. First finding the app, e "i i, depth ig the apparent depth as real depth ~ shift and then using the relation refractive index is", 4, icPthupon apparent depth = [4 /(4-2)] = 2, . Finding the real depth and then using the relation re, , fractive index is re ., Note of thé shove Tactive index is real depth, , /apparent dep, f- 40D. Wire @ spherical lens in which the im,, , to this answer the a lage obtained is h, , lowing questions:, , , , ighly magnified ani, , Wy, , ae

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BA, hed, , 1 from, -~aleul, , ate!, , , , , , yerical lens used is, , , , 1 convex, convexo concay, , , , 3. concave, INO CONVEX, , F, , , , , , a) The focal length of lens is, , 1 100cm >, , 3. 025m i ¥, , f 4. both Zand 3, , (iii) The screen is placed at a distance of, , 1. 15cm ae in, , 3. 12.5cm ‘, , 4. data insufficient, , iv) If this lens is blackened at the lower half, , 1 The focal length would be halved, 2. The focal length is doubled, 3. The focal length remains unaffected, , , , , , 4. The focal length is % th., , Question 2, , 0 basic forms of mechanical energy are, , a, , , , Elastic potential and vibrational kinetic, otational kinetic, , , , 1, 2 Gravitational potential and, 3, , kinetic ‘gy and potential energy, , , , none of the above, , , , kilowatt hour is equal to :, 1. 36K] 2. 036M) 3. 3.6MJ 4, 0.36 KI “00k, , , , ¢) Ram and Shyam each of mass 45kg reach the fourth floor of # building in time 4 sec and 5 sec respectively. .ing, The ratio of their inertia is 2, 4:5 2, 5:4 naparg, , a 1-3 4. Information is incomplete. a. MG., 8 r,, , id) Identify in which of the case it constitutes a couple, , Dy 1

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—», , pokes 4, n| SN, , , , xdy becomes one third when, , s tripled and velocity i, , , , ile velocity is alse 1/3" +, , , , , , (i) mass of water lifted is, { 1. 20kg 2. 2kg 3. 200g 4. 20g, (ii) The mechanical energy possessed by the bucket at wight of 7.5m is, 1, potential energy, , , , 2. kinetic energy, 4, icket of mass 500g, , 3. translational kinetic energy, (iii) The total energy when the empty bia, from the surface of water is, , , , avitational potential er, , , , , , , , is falling freely under grav, , 1, 150) 2 75 3. 3007 4 50), , | (iv) What is the mass of water collected by the boy after 20 rounds of the bucket been drop, , ; well . re, lL. 2kg 2. 22kg, , , , 3. 40kg, Question 3, , (a) The relationship to evaluate the et, , 4. 220kg, Iicienc, 1 Mechanical advantage / velocity ratio, 2. load x displacement of load, 3. work output / work input, A,, , , , / effort x displacement of effort, , Power output / power input, | 5. all of the above, ; 20) (b) State which of the following statements are true., , 1. Mechanical advantage is always a unitless quantity, , , , led » mass is doubled and velocity trig, locity is triplex 2, , 15 of bucket through a height of 15, , , , , , , , ) ) iv), , Suestic, “ ¥ Sek, , s, —, , geen:, , 0;, , 5, Sy, , >renr, , 2, a, , &, oO, , ~

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eed,, , Velocity ratio is also called disp),, Exficiency is always less th ‘placement ratio, both 1 and 2, , sse of cranes and hoist the ye}, , aN one, , Inca eit, |, number of movable pulleys Mo, > 2number of pulleys, , Total number of pulleys, , , , , , 4. displacement of load/displacement, ent Of effort, , ) Asprinter covers a distance of 2p whit, 7 <i while running across joggers track of circumfer ‘4 i, 5 ggers track of circumference 44 cm. Find the, , , , , , , , work di by the sprinte he, printer if the distance travelles Meteo red, eTO . id by hir 1.76 x 10%, - = oO], 9 Iethe wave velocity of sound in air 3, 100) 4 1000), . in air is 336 ms" then the minimum di, + im > distance for echo to oct, bh » 2 18m, 3. 166m 4 br, , Observe the figure and answer the questions bel, , lta,, , , , (i) Describe the type of motion possessed by Charlene, 1. Acrobat 2, Free fall, , 3. Fall due to gravitational force 4. both 2and3, , , , hich fo f energy conserved in this case, , , , , , chanical energy 2 kinetic energy, , 4, wind energy, , , , avitational potential energy, , , , {iii} How would you relate energy at the top to energy at bottom., , Ll. Potential energy is greater than kinetic energy, , 2. Potential energy is less than kinetic energy, , 3. Gra, 4 Wind energy is equal to kinetic energy, coverns the above relation, , -y is equal to kinetic energy, , , , ential eners;, , v) Name the law which g), 1. Newton's law of gravitation 2. Law of conservation of mass abe, , on 4. Law of conservation of mechanical energ, 3. Law of conservation of mass of conservation of mechanical energy G, 12 P, Question 4 =, al | I { appears to sparkle in the dark ware, ed a) Select the correct reason why diamond apr a wan, >, &) 1. tthasa low critical angle of 24 ® r08, the diamond as a result of successive total internal reflection., , 2. Due to the light getting entrapped inside, 3. Due to refraction of light, , 4., 2 both 1 and 2 aie resis, , , , The energy transformation taking P!, y |. Mechanical energy to electrical energy | (ese, 2. electrical energy to mechanical enerBy, 3. Mechanical kinetic rotational enerBy 19 ses energy |, le} ie ae ey ae a poo same mass as the girl swings ona peste’ as aa = “, any One ich of the statements are correct pertaining to the boy anc BH ’, the girl inthe figure below. Which, 3) girl as shown

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HSS onesie fore Stax, , uh, , , , , , (b) 3, , 1, , nergy at extreme, The boy and girl posse wvitational potential energy at e, , , , , 2, The boy and girl posse ne total energy during its oscillation i 4, 3. Both 1 and 2, 4. None of the at, (A) A convex lens is 1, , power?, , , , : : ‘ = d) 2., ed to burn a piece of paper as shown in the figure What is its focal Jengy (a), , convex lens, , , , , , , , , , , , fe) 2., — () G, permet gE = a, 156m, ————_ ,, (i, 1. Focal length = 15cm and Power =+ (, 2. Focal length greater than 15em and Power = 6.67 D, 3. Focal length less than 15em and Power less than 6,67 D FS, 4. Focal length equal to 15cm and Power is more than 6.67 D os, (e) The figure shows the deviation of a ray of light when in minimum deviation position. Answer the fol, ing questions: ee (b) 3, (c) 3, (d) 4, (i) Is the diagram correct?, 1.» Yes,, 2 No, 3. Inlet ray angle must be equal to exit ra y angle, 4, None of these, 44 (2) The cela apie of incl ence and angle of emer setice ie:, / 1. angle of incidence is greater than angle of Bence is;, , emergence, 2. angle of emergence is greater than angle of ens, 3. angle of incidence is equal to angle of e, , emergence, 4. ee a BR Ob error