1
JEE Main 2022 (Online) 27th June Morning Shift
+4
-1

The current flowing through an ac circuit is given by

I = 5 sin(120$$\pi$$t)A

How long will the current take to reach the peak value starting from zero?

A
$${1 \over {60}}$$ s
B
60 s
C
$${1 \over {120}}$$ s
D
$${1 \over {240}}$$ s
2
JEE Main 2022 (Online) 25th June Evening Shift
+4
-1

A sinusoidal voltage V(t) = 210 sin 3000 t volt is applied to a series LCR circuit in which L = 10 mH, C = 25 $$\mu$$F and R = 100 $$\Omega$$. The phase difference ($$\Phi$$) between the applied voltage and resultant current will be :

A
tan$$-$$1(0.17)
B
tan$$-$$1(9.46)
C
tan$$-$$1(0.30)
D
tan$$-$$1(13.33)
3
JEE Main 2022 (Online) 25th June Morning Shift
+4
-1

Match List-I with List-II.

List - I List -II
(A) AC generator (I) Detects the presence of current in the circuit
(B) Galvanometer (II) Converts mechanical energy into electrical energy
(C) Transformer (III) Works on the principle of resonance in AC circuit
(D) Metal detector (IV) Changes an alternating voltage for smaller or greater value

Choose the correct answer from the options given below :

A
(A) - (II), (B) - (I), (C) - (IV), (D) - (III)
B
(A) - (II), (B) - (I), (C) - (III), (D) - (IV)
C
(A) - (III), (B) - (IV), (C) - (II), (D) - (I)
D
(A) - (III), (B) - (I), (C) - (II), (D) - (IV)
4
JEE Main 2022 (Online) 25th June Morning Shift
+4
-1

If wattless current flows in the AC circuit, then the circuit is :

A
Purely Resistive circuit
B
Purely Inductive circuit
C
LCR series circuit
D
RC series circuit only
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