1
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
Resistance n, each of r ohm, when connected in parallel give an equivalent resistance of R ohm. If these resistances were connected in series, the combination would have a resistance in ohms, equal to
A
n2R
B
R/n2
C
R/n
D
nR
2
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.
3
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 volt a.c. supply line. The power drawn by the combination in each case respectively will be
A
50 watt, 100 watt
B
100 watt, 50 watt
C
200 watt, 150 watt
D
50 watt, 200 watt
4
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
An electric kettle has two heating coils. When one of the coils is connected to an a.c. source, the water in the kettle boils in 10 minutes. When the other coil is used the water boils in 40 minutes. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be
A
8 minutes
B
4 minutes
C
25 minutes
D
15 minutes
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