1
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
What is the value of inductance L for which the current is maximum in a series LCR circuit with C = 10 $$\mu $$F and $$\omega $$ = 1000 s$$-$$1 ?
A
1 mH
B
cannot be calculated unless R is known
C
10 mH
D
100 mH
2
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 amp, the efficiency of the transformer is approximately
A
50%
B
90%
C
10%
D
30%
3
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
The electric and magnetic field of an electromagnetic wave are
A
in opposite phase and perpendicular to each other
B
in opposite phase and parallel to each other
C
in phase and perpendicular to each other
D
in phase and parallel to each other.
4
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
Two condensers, one of capacity C and other of capacity C/2 are connected to a V-volt battery, as shown in the figure. The work done in charging fully both the condensers is

AIPMT 2007 Physics - Capacitor Question 23 English
A
$${1 \over 4}C{V^2}$$
B
$${3 \over 4}C{V^2}$$
C
$${1 \over 2}C{V^2}$$
D
2CV2
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