1
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then
A
The resistance will be doubled and the specific resistance will be halved.
B
The resistance will be halved and the specific resistance will remain unchanged.
C
The resistance will be halved and the specific resistance will be doubled.
D
The resistance and the specific resistance, will both remain unchanged.
2
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
A galvanometer of 50 ohm resistance has 25 divisions. A current of 4 $$ \times $$ 10$$-$$4 ampere gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 volts, it should be connected with a resistance of
A
$$2500\,\Omega $$ as a shunt
B
2450 $$\Omega $$ as a shunt
C
2550 $$\Omega $$ in series
D
2450 $$\Omega $$ in series
3
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
To convert a galvanometer into a voltmeter one should connect a
A
high resistance in series with galvanometer
B
low resistance in series with galvanometer
C
high resistance in parallel wilh galvanometer
D
low resistance in parallel with galvanometer.
4
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
A coil of 40 henry inductance is connected in series with a resistance of 8 ohm and the combination is joined to the terminals of a 2 volt battery. The time constant of the circuit is
A
5 seconds
B
1/5 seconds
C
40 seconds
D
20 seconds
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