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Q.12 Two metallic spheres S1 and S2 are made of the<br />
same material and have identical surface finish.<br />
The mass of S1 is three times that of S2. Both the<br />
spheres are heated to the same high temperature<br />
and placed in the same room having lower<br />
temperature but are thermally insulated from each<br />
other. The ratio of the initial rate of cooling of<br />
S1 to that of S2 is:<br />
1<br />
(1) (2)<br />
3<br />
⎛ 1 ⎞<br />
(3)<br />
⎜<br />
⎟<br />
⎝ 3 ⎠<br />
⎛ 1 ⎞<br />
⎜ ⎟⎠<br />
⎝ 3<br />
1/<br />
3<br />
⎛ ⎞<br />
(4) ⎜<br />
3<br />
⎟<br />
⎜ ⎟<br />
⎝ 1 ⎠<br />
Q.13 If each capacitor is C then equivalent<br />
capacitance-<br />
Y<br />
X W<br />
Z<br />
(a) CXW = C<br />
(b) CYZ = 2C<br />
(c) CXY = 3C<br />
(1) a, b (2) a, b, c<br />
(3) b, c (4) None<br />
Q.14 If a charge q is placed at centre of the line<br />
joining two equal like charges Q then-<br />
(a) q is in equilibrium for value q = – Q/4 only<br />
(b) q is in equilibrium for value q = – Q/2 only<br />
(c) System is in equilibrium for q = – Q/4<br />
(d) q is in equilibrium for any value of q<br />
(1) c,d (2) a, c<br />
(3) a, d (4) None<br />
Q.15 The first law of thermodynamics incorporates<br />
the concepts of:<br />
(a) conservation of energy<br />
(b) conservation of heat<br />
(c) conservation of work<br />
(d) equivalence of heat and work<br />
(1) a, b (2) b, c<br />
(3) a, d (4) b, d<br />
Q.12 nks /kkfRod xksys S1 o S2 leku inkFkZ ds cus gS rFkk<br />
leku i`"Bh; ped gSA S1 dk nzO;eku S2 dk rhu<br />
xquk gSA nksukas xksyks dks leku mPp rki ij xje<br />
fd;k tkrk gS rFkk de rki okys leku dejs esa j[k<br />
fn;k tkrk gS ijUrq ,dnwljs ls Å"eh; :i ls<br />
foyfxrA S1 rFkk S2 dh izkjfEHkd 'khryu dh nj dk<br />
vuqikr gS -<br />
1<br />
(1) (2)<br />
3<br />
⎛ 1 ⎞<br />
(3)<br />
⎜<br />
⎟<br />
⎝ 3 ⎠<br />
CAREER POINT, CP Tower, Road No.1, IPIA, Kota (Raj.), Ph: 0744-3040000 Page # 4<br />
⎛ 1 ⎞<br />
⎜ ⎟⎠<br />
⎝ 3<br />
1/<br />
3<br />
⎛ ⎞<br />
(4) ⎜<br />
3<br />
⎟<br />
⎜ ⎟<br />
⎝ 1 ⎠<br />
Q.13 ;fn izR;sd la/kkfj=k dk eku C gS] rks rqY; /kkfjrk<br />
gksxh -<br />
Y<br />
X W<br />
Z<br />
(a) CXW = C<br />
(b) CYZ = 2C<br />
(c) CXY = 3C<br />
(1) a, b (2) a, b, c<br />
(3) b, c (4) dksbZ ugha<br />
Q.14 ;fn ,d vkos'k q nks ,dleku vkos'kksa Q dks tksM+us<br />
okyh js[kk ds dsUnz ij j[kk tkrk gS] rc -<br />
(a) dsoy q = – Q/4 eku ds fy, q lkE;koLFkk esa gS<br />
(b) dsoy q = – Q/2 eku ds fy, q lkE;koLFkk esa gS<br />
(c) q = – Q/4 ds fy, fudk; lkE;koLFkk esa gS<br />
(d) q ds fdlh eku ds fy, q lkE;koLFkk esa gS<br />
(1) c,d (2) a, c<br />
(3) a, d (4) dksbZ ugha<br />
Q.15 Å"ekxfrdh dk izFke fu;e fdldh vo/kkj.kk dks<br />
bafxr djrk gS -<br />
(a) ÅtkZ ds laj{k.k<br />
(b) Å"ek ds laj{k.k<br />
(c) dk;Z ds laj{k.k<br />
(d) Å"ek o dk;Z ds rqY;kad<br />
(1) a, b (2) b, c<br />
(3) a, d (iv) b, d
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