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4 Questions, , Question 1, , (a) Wavelength range of yellow light is 200A, i isishasn A 7 : nai 3, 5790A-5920A ae a) ¢, (b) Choose the incorrect statement 1, 1. Dispersion of white light occurs at the first surface of prism ;, 2. Deviation of light occurs at both the surface of prism ’, 3. The prism produce colours, 4, The prism splits the various colours present in the light incident on it, (c) If frequency of a yellow light is 6 x 10"°Hz. Then Wavelength of light in m, 1. 6*10°%m 2. 2*10%m 3. 05*10%m & 05m ), d) Chosee the correct statement | 4, ; 1, EM waves requires a material medium fer propagation, 2. EM waves are transverse wave, 3. EM waves reflects by Electric & Magnetic field, ) 4. The velocity of EM waves not changes when medium changes Cd), (e) Choose the correct statement with respect to lateral displacement, 1, Itoccurs in case of a rectangular glass slab, | 2 Itoccurs when ray passes through two optical media, : 3. Itis directly proportional to thickness of glass slab, ’ 4. Both land3, (£) Use this figure to answer the following question:, +, , , , s) (i) Emergent ray is /, , , , ~7) (ii) Angle of prism will be, , 1. AB 2, BC 3. CD 4. none of these, , , , aol 2, , 10:52 Sambalpur, Odisha

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’ gO deviation does nor =, af, , , , : orrect Statement abou, , fi it, , ] The image is always yj ; concave lens, The image is always diminist 2. The image is always real, , b Seiiioe tie Correct formula for magni dons ‘The image is always erect, , i db, 1, mel+ >, f 5 ase 3 maiek 4 m= O42, .je) The correct relation betw,, } ‘ween the speed of longitudinal waves (v), density of medium (d) and pressure (p) is, P fa, 1 ve J > d Pp yd, x =e a _ - —, a \p x. d 4 oo ,, , _(d) Choose the incorrect statement, 1. An wp is heard only if the distance of person producing sound is long enough to allow the reflected, sound to reach a person at least 0,1 sec after original sound is heard, 2. time taken to hear echo is S, 3. To hear the echo distinctly the reflecting surface in air should be at minimum 17m distance., 4. The size of reflector should be small enough as compared to wavelength of the sound., (e) Choose incorrect statement, 1. Sound wave require medium to propagate, 2. Range of audibility is 20 Hz to 20,000 Hz, 3. the sound of frequency greater than audibility range is called ultrasonic, 4. Infrasonic waves are audible for human ears., () Answer the following for convex lens using the diagram given :, , 2F, F,, , position is beyond 2F; the position of image will be :, , ers A scent ld 3 - 4. beyond 2F,, ; , the position of image, , 4 areal posi au, , = o 4. on the same side, behing the object, , 11 be on the same side, behind the object if the object is at:, , , , , , , , nsandF, 3. Between F, &2F, 4. at2F,, , will b ‘ oe fers 4 ses itadl 1, N 4 ae ieee > y, wa i vader ‘bee Tad & a, , , , +r (f, , , , 2021/11/22 10:52 Sambalpur, Odisha

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SN, BHM) Choose incorrect statement, , Pe Vader, MA>1, 1. Ifeffort arm = load arm, M.A<1 2 Ieffortarm>, . - ales onside ee <a ffort arm = load arm, M.A <], 1) Me) Work done by effort is, 1, pd 2 Joad « distance moved by effor, 3. Effort « distance moved by effort none of times., 4) ithe work dane by a heat per eat The power of heat fi bet 7 : nd, - 2isec 2 4fisec 3. SJisec, fe) The relationship to evaluate the efficiency. is, 1. power input/power output Lt 2 Scene nia eee,, 3. power output/power input wher 4. power ax powes put, , (f) For the figure given answer the following :, , 700 N, 600N, A boy lift a load of 600N through a height of 10m in 10 sec. The effort applied by boy on other end. “1p,, |) @ Velocity ratio of the pulley, , i 2 21 S52 a4 3, , ~) Gi) Efficiency of pulley, , («7% 2 76% 3, 80% 4. 86%, , _) Gil) Energy gained by load in a height of 10 m in 10 sec:, 1. 5000) 2 6000) 3. 7000) 4 8000), , ) (iv) Power developed by boy in raising load:, 1. 600W 2 700W 3. 800W 4. 900w, , Question 4, , 2.2) @) In linear motion the acceleration is, 1. Positive 2. Negative 3. Zero i eritent, , 2a) 0») ‘The force which is not a real force, 1. Force of tension 2. Centripetal force 3. Centrifugal force 4, Gravitational fort, Wo An oscillating, simple pendulum of mass 100 ¢ maximum height of 10 cm from rest, at its extreme ©, , side. Answer the following., 30) (@ Total energy of pendulum:, 1 oa 2 o001y , 3 0.001) 4 15, >.) ) (i) Velocity of bob at mean position ; ;, 1. 2m/sec 2. Amjeec’ 3 1414 m/sec 4. none of these, , , , , , Jar motion the velocity and speed are respectively:, , , , 2021/11/22 10:52 Sambalpur, Odisha, , , , |