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# pract2sol - QOLZL Sec-map Pracinee EYHM So [allows 1. An...

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Unformatted text preview: QOLZL Sec-map Pracinee EYHM So [allows 1. An object is placed a distance d in front of a plane mirror. The size of the . . .. l - 2 .- 2 : Imagemnbe i 14;)”0lo bCCaKSC iri- tcf~iyoz (173 ._._’;v a) the same size as the object, independent of d, or the position of the a; :- «(a observer. .4 ‘ . SO z: “.5... : b) dependent on the distance d. W 01 o '1 ' ya u 5 KO “ “a All" w {tho-3f my «21 I, ' c) ' dependent on where you are positioned when you look at the image. d) twice the size of the object. bcalus 6 when e) halfasbigasthe size ofthe object, you look I» ‘Hifhurfor 80-61;, mornnpjl you ﬁnd see a l\ eyaa. a r a (3 (M1 7'0 LL 2. How far from a lens of focal length 50 mm must an object be placed if it is ' to form a virtual image magniﬁed in size by a factor of 3? mm I 1 - l - .1. - + . a) 54-4 -——-+~—~ —— “In”: 2 IS UH‘ (Ar-é So IL<O b) 480mm 41 d5 L 50km 1M]:\73: EL“) So é'=”36po .-———r- c) 33.3mm K d 42.2mm ' l 2 __L _. .. ) 4h _3do 9 do — 33. 3 ‘ l e) 66.6 mm d o l 3. Which of the following is an accurate statement for mirrors, not necessarily plane? a a) none of the other answers is true . b) a mirror always forms an image larger than the object. Po r 13le 1m (rror c) a mirror always forms an image smaller than the object. I M‘ie 9M9 sue as d) a mirror always forms a real image. Ne var {lay- a f [mg 'm Irraw'z" e) a mirror always forms a virtual image. too-f #0,. a Camca‘,a m wrap ’ l w 1+‘L .f < do 4. The cross-sectional area of an adjustable single loop is reduced from 1 In2 to 0.25 m2 in 0.1 5. What is the average emf that is induced in the coil if it is in a region with a magnetic ﬁeld of 2 T upward and the coil’s plane is perpendicular to the magnetic ﬁeld. a) 9V ¢=BACOSQ=BA ? "9’13 133 = "NW/Q4" : ~1x2x---"j]”=lsv (1) 21V 43* a ' e) 12V veal; cwrwl' C 5. The current through a 50 .Q resistor is I : 0.83in(240t), given in Si units. Which statement is wrong grit a) The peak current is 0.8 A. 1'; ru 6 lo) The rms current is 0.57 A. Ifws : Io r 0’ 57A c) The current varies with a frequency of 38 Hz. 2‘” 'F: 2 1/0, So “g: £39: 38 Hz d) The power is dissipated in the resistor is 16W. F : R1,?” 2 ELM: : I; W a e) The maximum voltage across the resistor is 28 V. VD : 2 I0 : 50 x 0' g : L/ O l/ tier 2 5’ v 6. Which of the following is NOT true for electromagnetic waves? a) they consist of changing electric and magnetic ﬁelds a b) they travel at different speeds in vacuum, depending on their fre- quency In vacuum, waves Own a” (reﬁneriueS lravel 0) they transport energy oi ﬁe 50w 2 g}: Gad d) they transport momentum C :- -—’—— e) they can be reﬂected E7): 7. When a beam of light is reflected at a plane mirror, the reﬂected angle QT and the incident angle 6i are related by a) 6.+6.:90° 71: Murrol‘ equation '5 9,39; b) 6.+6.=180° a. ; (9r c) 6.+90°=9. l d) 6¢+18O°=0T x "—7 e) 6.42.200 8. At the second maxima on either side of the central bright spot in a double- slit experiment, light from MA): , Ma 0 cc a r when ‘He wa veg owe a) each opening travels the same distance. I” P A“ 9 8’! Wk ‘ 0L 1"" be W)!” b) one opening travels one wavelength of light farther than light from ‘He Pkﬁ the other opening. ' 1 9,311.9 Al‘ccef c) each opening is incoherent. by a,“ [p {-895 r “M be r a f d) one opening travels twice as far as light from the other opening. wage J. % e) one opening travels two wavelengths of light farther than light from F0 r he the other opening. CQ/h’h‘d no»; law»; +42 [>an are ‘Hie 3M8 lagﬂt) for The w’Hs brag/rt’spc‘f may FrM ' ' ’ ‘ ‘Hiaf/ hay dither but} 9. A lens produces a real image that is twice as large as the object and is located 15 cm from the lens. What is the focal length of the lens and the objectdistance. d‘ =+ (rea( (Rage) 3) none of these ~ ‘L . _. ~ ——'—)b) f==5cm, do=7.5cm Md lwl‘ )‘Zi’I-‘Ql \$0 ‘fo‘ZS-‘wn c) f=15cm, do=5cn1 d) f=7.5cm, do=5cm l ——L-—+ l -_.L..__.. w: e) f25cm, da=15cm IF 15 ~ fan 10. Some magnetic ﬁeld lines pass through a circular ring of some material. In order to induce an emf around the ring it is necessary that a) the material must be a conductor. g :- ‘ 2% / S 0 Ag; “W571. be #0/ @ WUS+ ) the material must be an insulator. )_ the ring be rotated. ) the number of magnetic ﬁeld lines passing through the ring be changed. e) none of the other statements are true. 11. Suppose the electric ﬁeld in an electromagnetic wave has a maximum strength of 1470 N/ C. What is the maximum strength of the magnetic field of the wave? 4 a) 6.4x10‘7T 8:55:19,” g: 4.7OX/0 T b) 8.8x10“7T 3'77?” c) 1.2 x 10—6 T d) 2.0 x 10"6 T ———> e) 4.9 X 10—6 T 12. Two circular copper loops of wire are located in parallel horizontal planes. The upper one has an counterclockwise constant current I flowing through it, looking from above. Again looking from above, the lower loop has a clockwise current in it. a) b) has an counterclockwise current in it. I c) slowly becomes positively charged. (1) slowly becomes negatively charged. @ -—->}’ e) has an upward magnetic ﬁeld through it. Inside ‘er _(oo,o, ’l‘ke V1 A+ hamcllll7Lt/e.+el/S ur ﬁe Waaﬁe'll‘lc; €19.10! IS I? I [5 cm34M-f ﬁle 16le WL’ “P. -.13€-_C./‘°E“5’”12 5° T‘Aere IS no EMF)”, he l” “’U‘ lac/yam he ream ‘Cor cur/Buff +a ﬁled 13. What do the letters “rms” stand for? Th e 9 fad FE” roof a) real modulated signal 0-; “LL/{e WEM (New; 9) b) rational metric system 0 { .HA‘E S “a ng‘ a c) root-inean-square d) reduced mean sine (function) x s X1 . [MS e) regular metric standard 14- In an RLC circuit, the impedance of the circuit always increases if R in- creases. W ‘ am?- a) alwaystrue' Z T URI—{’(XL‘ Xe); - k K lPCi‘éﬂSClﬂ, b; so 22, so WM): c OnytrueifXL=Xc . d) onlytrueifXL<XC Md 5° )5 He grate For} 6) only true ifXL>XC 15. Some X~rays in an X-ray machine have a wavelength of 2.1 nm. What is the frequency of these electromagnetic waves? c: 3 in mg . , - :7 _..,> 1.4 mm : = “‘“-~------’. *. X/O El 63:10-1le C 4:)” so I " 2.I*/D 7 /1/ Hi c) none of these d) 6.3 x 1017 Hz e) 1.4 x 1018 Hz 16. In a double-slit experiment7 it is observed that the distance between adja— cent inaxinia on a remote screen is 1 cm‘ What happens to the distance adjacent niaxima when the slit separation is cut in half? F0 r Ck ram 3 SC r 89 "1 J ~~~-—~§a) itincreasesto2crn L>>\J’ so S/NQ: b) it increases to 0.5 cm S 0 l’ g d ‘9 SI; of I g) «a 2 9) it decreases to 0.5 cm Mel Ay -> 2.43;. it decreases to 0.25 cm none of these 0 v (D CL V \i 4/ B \J Agile Mugged” S approaches 7%: CO”, ﬁe dauhwud flux Hrougl ‘He Call is (pcreagm? 50 ct curreu+ (g. ’NduCOd be Produce M 17. A bar magnet is allowed to fall vertically through a coil, starting from above the coil, as shown in the diagram. The current induced in the coil, as seen from above, is a) there is no current b) ﬁrst clockwise and then counterclockwise I c) clockwise ‘ --——-> d) ﬁrst counterclockwise and then clockwise e) counterclockwise ~ upwa‘dg 41M +£rou5‘. ‘Hwe loop, I to luck requires 0 Corme clock wise Current ALF-lg,» Hg WQjV‘Qf 8““! “WWII, H‘s ﬁlm 5251;); +0 decrease, mdﬁe - D . beamed” tune; 5 I; l N 3H: opposr/e d {PCC‘hW I ...
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## This note was uploaded on 04/03/2008 for the course PHYSICS 204 taught by Professor Horton during the Spring '08 term at Rutgers.

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pract2sol - QOLZL Sec-map Pracinee EYHM So [allows 1. An...

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