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Class 12 ISC Board Exam 2018 : Physics

7 pages, 51 questions, 40 questions with responses, 56 total responses,

Antarik Dawn
Surendranath Law College, Kolkata
B.A.LL.B. Law

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(N o o th e r c h a n g e s a re m a d e in th c e x p e r im e n t ) c e ll E o f e m f l 5 n a il y o (ii) H (iii) A m o v in a u n o w n a x (iv ) in g q u e s t io w w g itb r m im u m W h y is th e c u c o n v e r t a m o v in g co v an o il g a in g e q tr a v e h a rg e d p a r tic h W n e d B f e m a g n e t ic g th e p o s itiv e x m ill th e fo r c e a c tin g a o n w tm e te r ? m e te r in to a v o is e n te rs on q be ? e o co l a tr a n s fo rm e r a m in a te d? 1 2 1 8 -8 6 I A Scanned by (v ) O r d in (i e a r ise d ) lig h t is in c id e n t o n th e s u r fa c e o f a po r ia l a t th e a r is in g a n g le I it is p a r t y r e lle c te d a n d p a r tly re fr a c te d w h a t is th e a n g le b e tw n th e fle c te d a n d tite r e fra c te d ra y s ? a ry un tr a n s p a r e n t m a te (v i) D (v ii) N e fin e co he r e n t am e a m a f ig h t s o u rc e s o te r ia w h ic h is u se d in m a re a c to r S e c tio A Q \ e s tio n D e fin e n sw e r a (a ) r o d s in a n u c le a r B n l q e s tio n s 12 1 c r r e n u e s t io n t r o co 2 t d e n s ity W r ite a n e x d r ift s p e e d Q k in g p re s s io h ic h n w t c o n n e c ts c u r r e d e s i y w ith 3 A lo 12 1 t is r ig id g h o r iz o n ta l w ire P c a r r ie s a c u rre n t o f 5 0 A y fix e d A n o th e r w ire Q is p la c e d d ir e c t b d l l i a P v t h o e a n a ra e o a s s o w n n F g rw e b e lo w y p T h e w e ig h t p e r u n it le n g th o f th e w ire Q is 0 0 2 5 N m ] a n d it c a rr ie s a c u m en t F in d th e d is ta n c e r o f th e w ire Q fro m th e w ir e P s o th a t th e w ire Q o f 2 5A i re m a n s a t r e s L n ' ' 25 A Q v acu um r 50 A V > P F ig r e 1 O R C a lc u a te fo rc e f o w in g in th e w pe r ir e A it e n g t h a c tin g o n th e F g u r e 2 b e lo w ) S e e ( u n w ir e B d u e Io th e cu n e n t 2 QA r lc m V F ig u acuum e 2 3 1 2 1 8-8 6 1A T r o v e r Scanned by Q e s tio n 21 4 (i) E x p la in C O i) A Q u n m a gn e N Q u es S ta te Q e m f ? S ta te n a a m e a re a o nux d a t r is h t a n g le s to is h e ' C a lc u la te th e T 5 10 f0 4m d e n s ity y tw a n fa c to o rs o n w h ic h it d e p c n d \ o f th c spe e d o f ga m m a n r ra d io w a v s da r s y s te m u se th a t to ra y s in g n e tic w ave w h ic h is u se d in th c ra d in n f g 5 ) ha s a s s (r e fra c tiv e in d e x Ca a n d 30 c m c u la te its fo c a e n g th m ade o s p h c r ic a tw o s u r fa c e s 2 tio n 8 y a w o d ifr e re n c e s b e tw W ith tio een a r y ra in p r im bo w a n d se c o n d a ry r a in bo w 9 O i) n C a c u la te B a Q u es ro g lie h y p o th e s is r e fe r e n c e to e c t r ic p h o to e e d fre c d e fin e t h r e s h o w a v e le n g th 10 th e e r s e r ie s o m in im w a v e le n u m g th f o th e s p c c tra in e in p ro s e n t f h y d ro g e n tio n 1 1 W h a t is (a ) tio e le c tr o m a a n S ta te d e B m ra ft n a v ig a tio (i) u es b s ta n c e ? n v ex u e s tio n Q d su zl le n s in g ra d ii 2 0 c m ha v an tic t o n 7 b ic o A il h a v in g 6 0 turn s lie ld o a g n e tic i h t a s s r o u g h it n p g c 6 a ir c ra u es m 21 v ac u u m Q m W h a t is th e (ii) a co t c n u x t o m o u e s tio n (i) rm p a ra m r a 5 u e s tio n W h a t is Q ifo a ' g u la r r e c ta n a w fo r ie s m ea n t b y p a ir a n n ih lla tio n 7 W r ite a b a la n ce e q u a tio n d fo r th e sa m e O R W h a t is b in d in g (b ) Q b y th e te r m s h i b e u ? fa nuc e r g y e n t m e o f a ra d io a c tiv e su b o ta c e an d o 12 12 e s tio n m o a ?o m c a tio n s y s te m n m d u io w , h a t is m ean t by m o d a tio n ? S ta te y tw o ty p t o f n = = p b 4 IZ I W IA : T Scanned by s e c tio A Q n e s t io i n n sw e r a c n ll q t e s tio 13 p r e s s io n fo r in te n s ity o f e tr ic fie ld a p o s it io n o f a n e c c tr ic d ip o c Q an e x e s d o n D e duce an z an d C Q = cs tio n 15 ( ) 13 1 at a p o in t in e d o p o s itio n ie 14 C C n s 6 1 ex s s io n p re 13 1 fo 3 a re c o n n e c te r e q iv d in p a ra e t p a c ita n c e ca C lk l w hm th re e ito c\ rs 13 an d E 2 b a tte r ie s h a v in e m f o r 3 4 V a n d IO V re s p e c tiv e ly a n d g a n d 2 Q re s c c tiv c T h e y a re c o n n e c te d a s s h o w n p y in f a r e 3 b e U s in g K ir c h b o m s ' L w s o f e o w e c tr ic a l n e t w o r k c a c u a te th e c u r r e n ts I a n d z internal a r e tw o re s is a n c e o f n 4 1 10 V F ig 2Q 3 u re O R (b ) A n e e c tr ic its fi am m Q u c h b u lb is e nt d 2 0 0 V 100 W C a lc u la te e e c t r ic a l r e s is ta n c e o f h b u lb s a r e c o n n e c te d in s e r ie s to a 2 0 0 V s u pp y ho w il f o w th ro u g h th e m ? f f v e m a rke , su c , c u r re n t w e s tio 1 6 () a Fo r an 13 ] y p r is m p ro v e th a t s fn ' w h e r e th e te r m s n ' h a v e th e ir o r p u su a = m ( ) l e a n in g O R (b ) W h e n tw o th e n s e s a re k e p t in n l M i f t e e n g th F is g iv e n b y ec v e o c a co n w + 1 . e te rm s h a v e th e ir u su a lm F f e a n in g L p ro ve tt a t th e ir c o m b in e d o r ' f 5 l? lm lA G T r m r i Scanned by Q (i) In Y o u n v a r ie s w O i) n F a Q W 13 1 17 u e s t io n ' g s d o u b le ith d is ta n c e h o fe ra u n ffe c te d u e s tio n d i{Tra c tio r he n w s r ite o n e ba a n ce e uc ear fis s io n (ii) N u c le a r fu s io n (iii) E m is s io tio n 19 W ith Z n o r e fe re n c e e n er , it s e p a ra tio d N u es n p e r im en h o w is th e n ar gu is in c re a s e d ? an qu fP to tio a (i e se m a ne ea c h to f th e o b r ig h t c e n tr a f lig h t fr in g e g a tiv e b e ta p a r tic le ) u se o fa Z A u es id th w o sho w ic o n d u c to r d e v ic e s W h a t is th e d io d e n e n e r , d e fin e p ty p e a se m d a r e s is to r R ic o n d u c to r an d io d e ? S e c t io Q in te n s ity ly h o w g r a p h ic a sho w t 18 (i) Q it e x s nn ve r a n D t q u e s tio ns tio n 2 0 ie d to a is a p p n a lte r n a tin g e m f o f 2 2 0 V h a v in g r e s is ta n c e o f 16 0 0 a n d a c a p a c ito r C ta n e e to le a d th e s u p p y v o lta g e b y a n a n g c ir c u it c o n ta in in A = a lc u a te : ' in s e r ie s T he g a c u r re n t is fo un d (3/4 ) ( ) T h e c a p a c itiv e r e a c ta n c e (2 ) Im p e d a n c e (3 ) C u r r e n t flo w in g in th e c ir c u it (i) C (ii) If th e fre q u e n c y o f th e a p p lie d e m is 5 0 H ' c a p a c ita n c e o f th e c a p a c ito r C ? w o h a t is th e c irc u it f th e v a lu e o f th e O R (b ) A n g e n e ra to r g e n e r a t in g a n c o m b in a tio n o f 1 6 / F A C a s e r ie s C a te a lc u (i) Im p e d a n c e (ii) R (iii) Po eso n a n w er o f th e fo fE p a c ito r c ir c u it a t th e t fr e q u e n c y fa c to em ca g iv e n 3 00 IH s in (10 0 7r 6 ) V is in d u c to fr e q u r an c o n n e c te d to d 10 0 Q r e s is to r e n cy A r a t r es o n a n t fr e q u e n c y 1 2 1 8 8 6 IA Scanned by Scanned by

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