1
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
In a series LCR resonance circuit, if we change the resistance only, from a lower to higher value :
A
The bandwidth of resonance circuit will increase.
B
The resonance frequency will increase.
C
The quality factor will increase.
D
The quality factor and the resonance frequency will remain constant.
2
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
An AC source rated 220 V, 50 Hz is connected to a resistor. The time taken by the current to change from its maximum to the rms value is :
A
2.5 ms
B
25 ms
C
2.5 s
D
0.25 ms
3
JEE Main 2021 (Online) 17th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Match List - I with List - II

List - I List - II
(a) Phase difference between current and voltage in a purely resistive AC circuit (i) $${\pi \over 2}$$; current leads voltage
(b) Phase difference between current and voltage in a pure inductive AC circuit (ii) zero
(c) Phase difference between current and voltage in a pure capacitive AC circuit (iii) $${\pi \over 2}$$; current lags voltage
(d) Phase difference between current and voltage in an LCR series circuit (iv) $${\tan ^{ - 1}}\left( {{{{X_C} - {X_L}} \over R}} \right)$$


Choose the most appropriate answer from the options given below :
A
(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
B
(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
C
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
D
(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
4
JEE Main 2021 (Online) 17th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
What happens to the inductive reactance and the current in a purely inductive circuit if the frequency is halved?
A
Both, inducting reactance and current will be doubled.
B
Inductive reactance will be doubled and current will be halved.
C
Both, inductive reactance and current will be halved.
D
Inductive reactance will be halved and current will be doubled.
JEE Main Subjects
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
CBSE
Class 12