1
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Change Language
A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It
A
will become rigif showing no movement
B
will stay in any position
C
will stay in north-south direction only
D
will stay in east-west direction only
2
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Change Language
Four point charges $$-$$Q, $$-$$q, 2q and 2Q are placed, one at each corner of the square. The relation between Q and q for which the potential at the centre of the square is zero is
A
Q = $$-$$q
B
Q = $$ - {1 \over q}$$
C
Q = q
D
Q = $${1 \over q}$$
3
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Change Language
If voltage across a bulb rated 220 volt-100 watt drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is
A
20%
B
2.5%
C
5%
D
10%
4
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Change Language
In an electrical circuit R, L, C and a.c. voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage and the current in the circuit is If instead, C is removed from the circuit, the phase difference is again. The power factor of the circuit is
A
$${1 \over 2}$$
B
$${1 \over {\sqrt 2 }}$$
C
1
D
$${{\sqrt 3 } \over 2}$$