1
NEET 2013 (Karnataka)
+4
-1
The primary of a transformer when connected to a dc battery of 10 Volt draws a current of 1 mA. The number of turns of the primary and secondary windings are 50 and 100 respectively. The voltage in the secondary and the current drawn by the circuit in the secondary are respectively
A
20 V and 2.0 mA
B
10 V and 0.5 mA
C
Zero volt and therefore no current
D
20 V and 0.5 mA
2
NEET 2013
+4
-1
A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when
A
a capacitance of reactance XC = XL is included in the same citcuit.
B
an iron rod is inserted in the coil.
C
frequency of the AC source is decreased.
D
number of turns in the coil is reduced.
3
AIPMT 2012 Mains
+4
-1
The instantaneous values of alternating current and voltage in a circuit are given as

$$i = {1 \over {\sqrt 2 }}$$ sin (100 $$\pi$$t) ampere

$$e = {1 \over {\sqrt 2 }}\sin \left( {100\pi t + {\pi \over 3}} \right)$$ Volt

The average power in watts consumed in the circuit is
A
$${1 \over 4}$$
B
$${{\sqrt 3 } \over 4}$$
C
$${1 \over 2}$$
D
$${1 \over 8}$$
4
AIPMT 2012 Prelims
+4
-1
The current $$(I)$$ in the inductance is varying with time according to the plot shown in figure.

Which one of the following is the correct variation of voltage with time in the coil ?
A
B
C
D
EXAM MAP
Medical
NEET