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Date, Time, , BENAKATTI PU COLLEGE, , BAGALKOT ROAD, VIDYA NAGAR, VIJAYAPURA, , :02/10/2022, :00:45;00Mins, , Marks : 180, , TEST ID: 1800, PHYSICS-PU-II, , 9.RAY OPTICS AND OPTICAL INSTRUMENTS, , , , Single Correct Answer Type, , 1., , 2, , The plane faces of two identical plano convex, lenses, each with focal length f are pressed, against cach other using an optical glue to, form a usual convex lens. The distance from, the optical centre at which an object must be, placed to obtain the image same as the size of, object is, , a) f me Df 4) oF, , A init drop a air Ve the light ray is, , ‘es, , The diameter of the eye-ball of a normal eye is, about 2.5 cm. The power of the eye lens varies, from, , a)2Dtw10D b) 40D to 32D, 9Dws8dD d)44Dto40D, , Ina thin spherical fish howl of radius 10 cm, filled with water of refractive index 4/3 there, is a small fish ata distance of 4 cm from the, centre C as shown in figure. Where will the, image of fish appear, if seen from E, , Lx, , aj5.2cm b)72cem c)4.2em d)3.2em, When the rectangular metal tank is filled to the, top with an unknown liquid, as observer with, eyes level with the top of the tank can just see, the corner £; a ray that refracts towards the, observer at the top surface of the liquid is, shown. The refractive index of the liquid will, be, , , , A-~<, , , , a) 1.2, , b) 14, Asmall fish 0.4m below the surface of a lake, is, viewed through a simple converging lens of, focal length 3 m. The lens is kept at 0.2 m, above the water surface such that fish lies on, , ©) 16 9 d)19, , the optical axis of the lens. The image of the, , fish seen by observer will be at (etwater = ‘), , 7 <>, , , , a) A distance of 0.2 m from the water surface, b) A distance of 0.6 m from the water surface, c) A distance of 0.3 m from the water surface, d)The same location of fish, Two point light sources are 24 cm apart., Where should a convex lens of focal length, 9.cm be put in between them from one source, so that the images of both the sources are, formed at the same place, aj6cm b)9cm— c)i2em d)iScem, An optical fibre consists of core of zy, surrounded by a cladding of #, < 4. A beam of, light enters form air at an angle @ with axis of, fibre. The highest a for which ray can be, travelled through fibre is, , se, , , , a)cos™' |e — pw? b) sin=* la-w, c)tan™ |uz — we d) sec? [uz — n3, , Aray of light travels from an optically denser, Pagel|i

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to rarer medium. The critical angle for the two, media is C. The maximum possible deviation of, the ray will be, , VG-c)2c In-2¢ Da-c, , 10. An observer can see through a pin-hole the top, , end of a thin rod of height h, placed as shown, in the figure. The beaker height is 3h and its, radius h. When the beaker is filled with a, liquid up to a height 2h, he can see the lower, end of the rod. Then the refractive index of the, , liquid is, De, a, , — » —, , a) 5/2 b) /G72) 9 (G72) 3/2, , 11, A point source of light B is placed at a distance, , L in front of the centre of a mirror width d, hung vertically on a wall. A man walks in front, of the mirror along a line parallel to the mirror, at a distance 2L from it as shown. The greater, distance over which he can see the image of, the light source in the mirror is, , ote, — A, — i —, a)d/2 b)d c)2d sd) 3d, , 12, A fish rising vertically up towards the surface, , of water with speed 3 ms~! observes a bird, diving vertically down towards it with speed, 9 ms—*. The actual velocity of bird is, , , , ap 4s b), ms?, , 13. The maximum illumination on a screen at a, , distance of 2 m from a lamp is 25 lux. The, , value of total luminous flux emitted by the, , ©) 3.0, ms7?, , d) 34, , 5.ms71 ms", , lamp is, a) 1256 lumen b) 1600 lumen, c) 100 candela d) 400 Iumen, , , , 14., , 15., , 16,, , 17., , 18., , 19., , 20., , 21., , 22., , 23., , If in compound microscope m, and m, be the, , linear magnification of the objective lens and, , eye lens respectively, then magnifying power, , of the compound microscope will be, , a)m, — mz b) /m, +m,, , c) (my + mz) /2 d) my x mz, , A Gallilean telescope has objective and eye, piece of focal lengths 200 cm and 2 cm, , respectively. The magnifying power of the, , telescope for normal vision is, , a) 90 b)100 =e) 108s dd) 98, , The magnifying power of a simple microscope, , is 6. The focal length of its lens in metres will, , be, if least distance of distinct vision is 25 cm, , a)0.05 »b)006 0.25 d)012, , The minimum magnifying power of a telescope, , is M, If the focal length of its eye lens is halved,, , the magnifying power will become, , a)M/2 b)2M c)3M dj4M, , For a telescope to have large resolving power, , the, , a) Focal length of its objective should be large, , b) Focal length of its eye piece should be large, , C) Focal length of its eye piece should be small, , d) Aperture of its objective should be large, , A person using a lens as a simple microscope, , sees an, , a) Inverted virtual image, , b) Inverted real magnified image, , c) Upright virtual image, , d) Upright real magnified image, , To remove myopia (short sightedness) a lens, , of power 0.66 D is required. The distance point, , of the eye is approximately, , a) 100cm b)150¢em c) 50cm d)25cem, , Stars are not visible in the day time because, , a) Stars hide behind the sun, , b) Stars do not reflect sun rays during day, , c) Stars vanish during the day, , d) Atmosphere scatters sunlight into a blanket, of extreme brightness through which faint, stars cannot be visible, , White light is passed through a prism whose, , angle is 5°, If the refractive indices for rays of, , red and blue colour are respectively 1.64 and, , 1,66, the angle of deviation between the two, , colours will be, , a) 0.1 degree b) 0.2 degree, , c) 0.3 degree d) 0.4 degree, , In an equilateral prism if incident angle is 45°, , Page|2

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24,, , 25., , 26., , 27., , 28., , 30., , then minimum deviation is, , a) 30° b) 60° c) 45° d) 90°, , A prism ARC of angle 30° has its face AC, silvered. A ray of light incident at an angle of, 45° at the face AB retraces its path after, refraction at face AB and reflection at face AC., The refractive index of the material of the, , prism is, , , , a) 15 b)3/v2_¢) v2 4) 4/3, Angle of deviation (8) by a prism (refractive, index = « and supposing the angle of prism A, to be small) can be given by, , , , a)JS=(u-1)A b)S=(u+ DA, sin“* u-1, , \o= 2 =o, , cjé= ome O6= a1", , 2, Formula for dispersive power is (where, , symbols have their usual meanings), , or, If the refractive indices of crown glass for red,, yellow and violet colours are respectively, My, My and p,, then the dispersive power of this, glass would be, , , , Hy — be My = He, Val Vues l, , Ur — Mp By = Mr, , : d) eee 1, Vy = He ), , The ratio of angle of minimum deviation of a, prism in air and when dipped in water will be, Calg = 3/2 andgu,, = 4/3), , a) 1/8 b) 1/2 c) 3/4 d)1/4, Whatwill be the colour of sky as seen from the, earth, if there were no atmosphere, , a) Black — b) Blue c) Orange d) Red, , . A boy is trying to start a fire by focusing, , Sunlight on a piece of paper using an, equiconvex lens of focal length 10 cm. The, diameter of the Sun is 1.39 « 10° m and its, means distance from the earth is 1.5 x 1024m., What is the diameter of the Sun's image on the, , paper, a) 6.5 x 105m b) 12.4 x 107m, c) 9.2 x 10°4m d) 6.5 x 10°*m, , Adouble convex lens of glass of « = 1.5 has, radius of curvature of each of its surface is 0.2, , , , 31., , 32., , 33., , 34., , 36., , 37., , 38., , m. The power of the lens is, , a) +10 dioptres b) —10 dioptres, , c) —5 dioptres d) +5 dioptres, , The minimum distance between an object and, its real image formed by a convex lens is, aisf bj2f o2sf ada, Focal length of a converging lens in air is R. If it, is dipped in water of refractive index 1.33,, , then its focal length will be around (Refractive, index of lens material ts 1.5), a)R b) 2k c) 4R, The ray diagram could be correct, , d) R/2, , a)ifn, =n, = ny, , b)lfn, =n, andny <n,, , c)lfn, = nz andm, > ng, , d) Under no circumstances, , An achromatic combination of lenses is formed, by joining, , a) 2 convex lenses, , b)2 concave lenses, , c) 1 convex lens and 1 concave lens, , d) Convex lens and plane mirror, , . Focal length of a convex lens will be maximum, for, a) Blue light b) Yellow light, c) Green light d) Red light, , The dispersive powers of glasses of lenses used, , in an achromatic pair are in the ratio 5 : 3, If, , the focal length of the concave lens is 15 cm,, , then the nature and focal length of the other, , lens would be, , a) Convex, 9 cm b) Concave, 9 cm, , c) Convex, 25 cm d) Concave, 25 cm, , A converging lens is used to form an image on, , a screen. When upper half of the lens is, , covered by an opaque screen, , a) Half the image will disappear, , b) Complete image will be formed of same, intensity, , Cc) Half image will be formed of same intensity, , d) Complete image will be formed of decreased, intensity, , An equiconvex lens is cut into two halves along, , (i) XOX’ and (ii) YOY’ as shown in the figure., , Let f, f', f" be the focal lengths of the complete, , Page|3

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39,, , 40., , 41., , 42., , lens, of each half in case (1), and of each half in, case (ii), respectively., y, , Choose the correct statement from the, following, , ars =f ws =fhsf"=f, \f=2ff"=2f df=ff" =2f, , If 1, and /, be the size of the images, respectively for the two positions of lens in the, displacement method, then the size of the, object is given by, , Yi/_ Dx °°) \ixh *) /E/,, If light travels a distance x in ¢, sec in air and, 10 x distance in t, in a medium, the critical, , angle of the medium will be, a) tan“? (2) b) sin? (2), ¢)sin=! (=) d) tan“! (=), , Refractive index of a medium ts yu. The, incidence angle is twice that of refracting, angle. The angle of incidence is, , 1% -1f#, a) cos™* (5) b) sin™? (5), c) 2cos™* () d) sin"? yw, A light ray from air is incident (as shown in, , , , 43., , 44., , 45., , figure) at one end of a glass fibre (refractive, index yu = 1.5) making an incidence angle of, 60° on the lateral surface, so that it undergoes, a total internal reflection. How much time, would it take to traverse the straight fibre of, length Lkm, , , , a) 3.33ms b)6.67us c) 5.775 d)385 ys, The critical angle for a medium is 60°, The, refractive index of the medium is, a) 2 b) v2 c) a) V3, , 4 go WAY T, Critical angle is that angle of incidence in the, denser medium for which the angle of, reflection in rarer medium is, a) 0° b)57° sc) 90° ~— dd) THO, In the figure shown, for an angle of incidence, 45°, atthe top surface, what is the minimum, refractive index needed for total internal, reflection at vertical face, , , , Page|4

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BENAKATTI PU COLLEGE, , BAGALKOT ROAD, VIDYA NAGAR, VIJAYAPURA, , , , NEET / IIT JEE, Date :02/07/2022 TEST ID: 1796, Time =: 00:45:00 CHEMISTRY, Marks : 180, 11.ALCOHOLS, PHENOLS AND ETHERS,3.CLASSIFICATION OF ELEMENTS AND PERIODICITY IN, PROPERTIES,4.CHEMICAL BONDING AND MOLECULAR STRUCTURE, , Single Correct Answer Type 56. Carbon suboxide (C02) has recently been, 46. Which one of the following has the highest shown as a component of the atmosphere of, , electronegativity? Venus, Which of the following formulation, , a) Si b)P «cl d) Br raepresents the correct ground state Lewis, , 47., , 49., , 50., , 51., , 53., , The correct order of electron gain enthalpy, with negative sign of F, Cl, Br and 1, having, atomic number 9, 17, 35 and 53 respectively, is, a)CI>F>Br>1 b)F>Cl>Br>1, c)I>Br>Cl>F d)I>Br>F>Cl, Difference between § and $?~as $27 has, , a) Larger radii and larger size, , b) Smaller radii and larger size, , ¢) Larger radii and smaller size, , d) Smaller radii and smaller size, , When an electron is removed from an atom, its, energy, , a) Increase b) Decrease, , c) Remains the same d) None ofthese, Which of the following pairs show reverse, properties on moving along a period from left, to right and from top to down ina group?, , a) Nuclear charge and electron affinity, b)Ionisation radius and electron affinity, , c) Atomic radius and electron affinity, , d) None of the above, , The first ionisation potential is maximum for, , a)B b)N co d) Be, , The maximum valency of an element with, , atomic number 7 is, , a)2 b)3 c)4 d)5, , The first ionisation energy of lithium will be, , a) Greater than Be b) Less than Be, , ¢) Equal to thatofNa — d) Equal to that of F, . Which element has the lowest, , electronegativity?, , a) Li b)F ocd d) Fe, , Nitrogen dioxide cannot be prepared by, , heating, , a) KNO3 b) Pb(NO3)2, , c) Cu(NO3)2 dj AgNO,, , , , 57., , 58., , 5., , 60., , 61., , structure for carbon suboxide?, , , , 20: Cx0: E C:0:, A simple of a coordinate covalent bond is, exhibited by, a) HO) h)NH, c)C,H, d)H,SO,, Which is not a paramagnetic species?, a)Q,, b)O}, ©) 0;, d)03Which of the following overlaps leads to, bonding?, , a) b) ©) porbitald), p-orbital, , s-orbital, , , , s-orbital, , Aco-bonded molecule MX, is T-shaped. The, number non-bonding pairs of electron is, , ajo b) 2, , cl d)Can be predicted, only if atomic, number of M is, known, , The maximum number of 90° angles between, bond pair-bond pair of electrons is observed in, , a) dsp? b)sp?d_ sc) dsp? d) sp? d?, hybridis hybridiz hybridis —_ hybridis, ation ation ation ation, , . The electronic configuration, , Pageli