1
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25

When a DC voltage is applied at the two ends of a circuit kept in a closed box, it is observed that the current gradually increases from zero to a certain value and then remains constant. What do you think that the circuit contains?
A
A resistor alone
B
A capacitor alone
C
A resistor and an inductor in series
D
A resistor and a capacitor in series
2
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
When a 60 mH inductor and a resistor are connected in series with an AC voltage source, the voltage leads the current by 60$$^\circ$$. If the inductor is replaced by a 0.5 $$\mu$$F capacitor, the voltage lags behind the current by 30$$^\circ$$. What is the frequency of the AC supply?
A
$${1 \over {2\pi }} \times {10^4}Hz$$
B
$${1 \over {\pi }} \times {10^4}Hz$$
C
$${3 \over {2\pi }} \times {10^4}Hz$$
D
$${1 \over {2\pi }} \times {10^8}Hz$$
3
WB JEE 2019
MCQ (Single Correct Answer)
+2
-0.5
A parallel plate capacitor in series with a resistance of 100$$\Omega$$, an inductor of 20 mH and an AC voltage source of variable frequency shows resonance at a frequency of $${{1250} \over \pi }$$ Hz. If this capacitor is charged by a DC voltage source to a voltage 25 V, what amount of charge will be stored in each plate of the capacitor?
A
0.2 $$\mu$$C
B
2 mC
C
0.2 mC
D
0.2 C
4
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.25
An alternating current is flowing through a series L-C-R circuit. It is found that the current reaches a value of 1 mA at both 200 Hz and 800 Hz frequency. What is the resonance frequency of the circuit?
A
600 Hz
B
300 Hz
C
500 Hz
D
400 Hz
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