1
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
Change Language
Two rods are joined end to end, as shown. Both have a cross-sectional area of 0.01 cm2. Each is 1 meter long. One rod is of copper with a resistivity of 1.7 $$ \times $$ 10$$-$$6 ohm-centimeter, the other is of iron with a resistivity of 10$$-$$5 ohm-centimeter.
NEET 2013 (Karnataka) Physics - Current Electricity Question 92 English
How much voltage is required to produce a current of 1 ampere in the rods?
A
0.00145 V
B
0.0145 V
C
1.7 $$ \times $$ 10$$-$$6 V
D
0.117 V
2
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
A wire of resistance 4 $$\Omega $$ is stretched to twice its original length. The resistance of stretched wire would be
A
8 $$\Omega $$
B
16 $$\Omega $$
C
2 $$\Omega $$
D
4 $$\Omega $$
3
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 $$\Omega $$ is
A
0.8 $$\Omega $$
B
1.0 $$\Omega $$
C
0.2 $$\Omega $$
D
0.5 $$\Omega $$
4
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
The resistances of the four arms P, Q, R and S in a Wheatstone's bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively. If the galvanometer resistance is 50 ohm, the current drawn from the celll will be
A
0.1 A
B
2.0 A
C
1.0 A
D
0.2 A
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