1
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
Fuse wire is a wire of
A
high resistance and high melting point
B
high resistance and low melting point
C
low resistance and low melting point
D
low resistance and high melting point
2
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
In a Wheatstone's bridge all the four arms have equal resistance R. If the resistance of the galvanometer arm is also R, the equivalent resistance of the combination as seen by the battery is
A
R/4
B
R/2
C
R
D
2R
3
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
4
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
A long solenoid carrying a current producess a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is
A
B/2
B
B
C
2B
D
4B
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