Old Exam Papers June 2012 (Set 2)

7. (a) State and explain the Biot-Savart law. 3
ck;ks&lkoVZ fu;e dk dFku nhft;s o le>kb;sA
(b) Compare a potentiometer and a voltmetre. How
caliberation of voltmeter can be done with the help
of potentiometer ? 7
foHkoekih o oksYVehVj dh rqyuk dhft;sA foHkoekih
dh lgk;rk ls oksYVehVj dk v{kkadu fdl izdkj ls
fd;k tk ldrk gS \ 7
8. (a) Give the differences between direct current and
alternating current. 3
fn"V /kkjk o izR;korhZ /kkjk esa vUrj crkb;sA 3
(b) How many types of inductions are there ? Explain
the working of a transformer. 7
izsj.k fdrus izdkj ds gksrs gSa \ VªkalQkWeZj dh dk;Ziz.kkyh
dks le>kb;sA 7
9. (a) What is mass defect ? 5
nzO;eku {kfr D;k gksrh gS \ 5
(b) Derive the Einstein's photo electric equation. 5
200 4 BPH
3
cUn vkxZu uyh dh ewy vko`fÙk dh lw= LFkkiuk
dhft;sA 5
(b) What is resonance ? Explain by giving an example. 5
vuqukn D;k gksrk gS \ ,d mnkgj.k nsdj le>kb;sA 5
5. (a) Explain the difference between reflection and
refraction. 4
ijkorZu o viorZu esa vUrj Li"V dhft;sA 4
(b) Explain Young's double slit experiment of interfe-
rence. 6
;ax ds O;frdj.k ds f}&fLyV iz;ksx dks le>kb;sA 6
6. (a) State Coulomb's law of electrostats and explain. 3
dwykWe ds fLFkj oS|qr ds fu;e dk dFku nhft;s o
le>kb;sA 3
(b) Using Gauss law of electrostatics find the electric
field due to a r charged spherical conductor uniformly.
fLFkj oS|qrdh ds xkSl fu;e dh lgk;rk ls leku :i
ls vkosf'kr xksykdkj pkyd ds dkj.k fo|qr {ks= Kkr
dhft;sA 7
BPH 3 PTO
7