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) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Your friend is having eye sight problem. She is not able to see clearly a distant uniform window mesh and it appears to her as non-uniform and distorted. The doctor diagnosed the problem as :
A
Astigmatism
B
Myopia with Astigmatism
C
Presbyopia with Astigmatism
D
Myopia and Hypermetropia
4
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
A loop of flexible wire of irregular shape carrying current is placed in an external magnetic field. Identify the effect of the field on the wire.
A
Loop assumes circular shape with its plane normal to the field.
B
Loop assumes circular shape with its plane parallel to the field.
C
Wire gets stretched to become straight.
D
Shape of the loop remains unchanged.
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