Top 100 previous year question physics, Slides of Physics

Download Top 100 previous year question physics and more Slides Physics in PDF only on Docsity! TTT PZ MOST EXPECTED IN BOARDS Top 100 PYQ Physics ‘Quick revision) revision aaa ee Top 100 PYQ Physics eal ae V= Potential difference l= Current aed ai ere a CT aaneTE —JSL Top 100 PYQ Physics Resistance of the conductor mm elaraae A= Area of cross-section (p= (rhoyis a constant of proportionality and is called the electrical resistivity of the material of the conductor Top 100 PYQ Physics if resistor R1, R2, R38 is connected in series = Potential difference (In Series) = Resistance (In Series) RER,+R,+R; = Current (In Series) Top 100 PYQ Physics Joule’s law of heating — _ eats y — ao Eom TIE [A1Q) ae l= Current c S emits res Top 100 PYQ Physics Electric Power P=VI Or mo ao P=l?R=V2/R aan ee Top 100 PYQ Physics Mi ena a conductor is reducéd to half its initial value. In doing so thd heating effectsin the conductor will becomé: (A) half B) one-fourth C) four times >) ( Top 100 PYQ Physics Two heater wires of equal length are first connected in series and then in parallel with a battery. The ratio of heat produced in the two ort 7) aa | ; ao er re nt, Top 100 PYQ Physics = Laws of heating are given by : (A) Faraday (D) Maxwell Top 100 PYQ Physics = An electric iron draws a current of 4A when connected to a 220 V mains. Its resistance must be: (A) 40 ohm B) 55 ohm (C) 100 ohm (D) none of these ae meee Top 100 PYQ Physics * An electric iron is based upon a a ei i the principle of : (A) magnetic effect of current heating effect of current (C) chemical effect of current (D) none of these Top 100 PYQ Physics = Fuse wire is made up of : (A) Copper (B) Aluminium (C) Alnico Lead tin alloy Top 100 PYQ Physics # A 2\KW)boiler used for rire ALOR NMeO IE ema Ie following electrical energy in cs units per 34 pee (B) 120 units (C) 15 units (D) None of these Top 100 PYQ Physics (A) its resistance is negligible (B) it is cheaper its melting point is high (D) its filament is easily made Top 100 PYQ Physics = Heating element of electric iron 1s ies hokey ae A) Nichrome (B) Tungsten (C) Constantan (D) None of these Top 100 PYQ Physics = Keeping the potential difference constant, the resistance of the circuit is halved. The gL TRS Se eT current will become: (a) One-fourth (b) Four times (c) Half = If Rl and R2 be the ( resistance of the filament of ZIMA VeRO OM me Ke reeks ky occ @2ny) TOT (a) RI <R2 _ one eat c)R1=R2 DR Sie a Top 100 PYQ Physics = If the radius of a current carrying conductor is current through it change? Top 100 PYQ Physics = Ifa person has five resistors each of SEU) ohm, then the maximum resistance he can obtain by connecting them is aN (CC oa te (b) 5 Q etre eae ae COpare ae bt y y Top 100 PYQ Physics Top 100 PYQ Physics Two identical resistors, é resistance 15 Q, are connected in (i) osteo) Tem GUt ceva i turn toa ert oe ee Calculate the ratio of th&power consumed in the combination of resistors in each case. Top 100 PYQ Physics = A bulb is rated 5V; 500 mA. Calculate the rated power and resistance of the bulb when it ae Convex Mirror Hollow Sphere Sag Principal Axis -—t Here, F=FocalPoint ; C=Centerof Curvature ; f=Focal Length ;_ r=Radiusof Curvature ; P = Pole  Object on left Incident light Heights upwards positive + Distances against incident light negative Heights downwards negative — Distances along incident light positive Mirror Formula Top 100 PYQ Physics v= The distance of the image from the pole of the mirror is called the image folic] glen u= The distance of the object from its pole is called the object distance f= Focal length Incident ray Boundary Refraction of light Substance 1 Substance 2 Angle of refraction Refracted ray Top 100 PYQ Physics If cis the speed of light in air and v is the speed of light in the medium, then, the refractive index of the medium nm is given by Speed of light in air Speed of light in the medium v Top 100 PYQ Physics Me Lens Magnification Conver \ens al oe Top 100 PYQ Physics vate TMU eho SOKO) UN EE.) rarer to a denser medium it will have (a) Increased velocity (b) Decreased velocity (c) Decreased wavelength d) both (b) and (c) Top 100 PYQ Physics Hl MAIR etem erm Kiwi MIM eH Ih D.¢ Yeariccu CoB IMCQHHKomIC lm mais Conny is eee ee aa: elit A. The size of the image is reduced to one- ele B. The upper half of the image will be absent. ORNL e CE ai Ce Ure CBee D. There will be no effect Top 100 PYQ Physics A student conducts an activity using a flask of height 15 cm and a concave mirror. He finds that the image formed eevee height. What is the magnification of the sree (a) 45 times (ep ember) (c) 1/3 times SB stanton Top 100 PYQ Physics ssertion: A ray the mirror Rereceom ice ectien —_ oe Reason: In reflection. le of incidence is always oF rr equal to angle of reflection. 7 Lie Lr oth assertion and reason are true and reason is the orrect explanation of assertion (b) If both assertion and reason are true but reason is not the correct explanation of assertion (c) If assertion is true but reason is false. Top 100 PYQ Physics What is the radius of curvature of a plane mirror? i (a) Depend on size of mirror (b) zero (c) Infinity (d) Depend upon the distance of object from TVObteReye Top 100 PYQ Physics = Find the angle of incidence and the angle of reflection from the diagram (a)55 degree , 45 degree re ie oly tee l-rt-\ ae ; degree, 55 degree 5) O-35 =aam) ) (b (d) 45 degree, 45 degree normal to surface ' incident ray ' reflected ray NS SO tS 359/ yt @,=6, Top 100 PYQ Physics URS cree metro emt ecleoel@ noel lee Rene times as that of its speed in vacuum. What is the ROL Ue Usk Cem Rey leCem ee OL (a)1.0 (b)1.33 Top 100 PYQ Physics When white light is propagating throu a oy Ni Rae Rn CHLESe Salon L ae (CD Lee re olm eonm ents id Blue light moves fastest Ae Cea All the colours of the ne light move)with the RT TON OMS) BYerexel (d) Yellow light moves with the mean speed as that of thered and violet light. Top 100 PYQ Physics Blue colour of the sky is due to the Ge) toner men (a) Reflection of light (b) Refraction of light (c) Dispersion of light Top 100 PYQ Physics An object is placed in front of {Convex mirror) ts image is seven ean a) ata distance equal to the object distance in front of the mirror. b) at twice the distance of the object in front of the mirror. c) half the distance of the object in front of the mirror. behind the mirror and it’s position varies according to the object distance. Top 100 PYQ Physics What is the SI unit of power of a lens? Alas 2.Joule 3.Meter coal Top 100 PYQ Physics What is the formula of absolute refractive index (n) nr a of any medium? c=v/n _ = ee Va c n=c*v d. c=vtn Top 100 PYQ Physics Eye anatomy ~Sclera Retina Muscles——___ Macula Conjunctiva——_ rN Optic Cornea—__/ i \ ae a Vitreous \e eS = =" Persistence of Vision: It is the time for which the sensation of an object continue in the eye. It is about 1/16th of a second. ee NIRA Iona The ability of eye lens to adjust its focal length with the help of ciliary muscles is called Top 100 PYQ Physics Normal Eye Far-sighted Light Top 100 PYQ Physics Near point of the Eye For point of the Eye It is 25cm for normal eye. The minimum It is infinity for normal eye. It is the farthest distance at which object can be seen most point upto which the eye can see objects distinctly without strain. clearly scattering of light Scattering of light long wavelengths Top 100 PYQ Physics Top 100 PYQ Physics Twinkling of stars is due to- (a) Reflection of light by clouds (b)‘scattering of light by dust particles (c) dispersion of light by water drops oe Teles pheric refraction of starlight Top 100 PYQ Physics SP NSO Ls loree UTS Sen while the planets do not. he stars are much bigger in size than the (A) Both Assertion and Reason are true and the reason is the correct explanation of assertion. (B) Both Assertion and Reason are true and the reason is not the correct explanation of assertion. (C) Assertion is true but the Reason is false. (D) Assertion is false but Reason is true. Top 100 PYQ Physics - AVERT B Core 1 uC) cco view mirror fitted in One eae ——=fa)_ Is less(than one ) y (b) is more than Ga 7 hs (c) is equal to one (d) can be more than or less IAG Gor than_one depending upon Se NT Ee TCT Un ce eC nae) oa aaa front of it ee Top 100 PYQ Physics Achild is standing in front of a magic mirror. She D Gna portion of her body of the Elen Goan the legs smaller. The following is the order of combinations for the magic mirror from the top. (a) Plane, convex and concave b) Convex, concave and plane ) Concave, plane and ioe ) Convex, plane a NU Nba Top 100 PYQ Physics Having two eyes facilitates in A: Increasing the/(field of view B : Bringing three 1 C: Developing the concept of 4 Then the correct option is/are (a) A only (b) A and B only (c) B only (d) A,B ae Top 100 PYQ Physics The black opening between the aqueous humour and the lens is called- a iii (a) retina (b) iris (c) cornea (d) oe Top 100 PYQ Physics Near and far points of a young person normal eye respectively are (a) 0 and infinity (b) 0 and 25 cm (c) 25 cm and infinity (d) 25 cm and 150 cm. Top 100 PYQ Physics Myopia eee be ke — Nae | lens / Top 100 PYQ Physics Bi-focal lens are required to correct Top 100 PYQ ae The defective eye of a person has near point/0.5}m and couenD Way power far corrective lens required for ~~ a ED cereCerTat og) te .0\ 010s (ii) seeing distant objects, respectively are: (a) 0.5 D and +3D (b) +2D dnd-1D ()-2D and + 4D (d) 0.5 D and-3.0 D Top 100 PYQ Physics Wore layer_of atmosphere whose temperature the hot layer behave as optically. a el ——==>a)-denser medium ae (Gop Beclecuprarcrentenont (c) inactive medium (d) either denser or rarer medium Top 100 PYQ Physics Refraction of light by the earth’s atmosphere due to variation in : t g ee ETM ATS (a) atmospheric (Cp Rtenesjoiton! (c) atmospheri (d) atmospheri Top 100 PYQ Physics The deflection of light by A os of the atmosphere in all direction is called__— ff Light. on ee a - (a) dispersion? lute 77 Colors (b) scattering (c) interference Cnet Ds L ZA