1
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Two metal wires of identical dimensions are connected in series. If $$\sigma $$1 and $$\sigma $$2 are the conductivity of the combination is
A
$${{{\sigma _1} + {\sigma _2}} \over {{\sigma _1}{\sigma _2}}}$$
B
$${{{\sigma _1}{\sigma _2}} \over {{\sigma _1} + {\sigma _2}}}$$
C
$${{2{\sigma _1}{\sigma _2}} \over {{\sigma _1} + {\sigma _2}}}$$
D
$${{{\sigma _1} + {\sigma _2}} \over {2{\sigma _1}{\sigma _2}}}$$
2
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
A circuit contains an ammeter, a battery of 30 V and a resistance 40.8 ohm all connected in series. If the ammeter has a coil of resistance 480 ohm and a shunt of 20 ohm, the reading in the ammeter will be
A
2A
B
1A
C
0.5 A
D
0.25 A
3
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f. E0 and a resistance r1. An unknown e.m.f. E is balanced at a length $$l$$ of the potentiometer wire. The e.m.f. E will be given by
A
$${{{E_0}l} \over L}$$
B
$${{L{E_0}r} \over {\left( {r + {r_1}} \right)l}}$$
C
$${{L{E_0}r} \over {l{r_1}}}$$
D
$${{{E_0}r} \over {\left( {r + {r_1}} \right)}}.{l \over L}$$
4
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
A proton and an alpha particle both enter a region of uniform magnetic field B, moving at right angles to the field B. If the radius of circular orbits for both the particles is equal and the kinetic energy acquired by proton is 1 MeV, the energy acquired by the alpha particle will be
A
1.5 MeV
B
1 MeV
C
4 MeV
D
0.5 MeV
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