1
JEE Main 2022 (Online) 27th June Morning Shift
MCQ (Single Correct Answer)
+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?
2
JEE Main 2022 (Online) 25th June Evening Shift
MCQ (Single Correct Answer)
+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 :
3
JEE Main 2022 (Online) 25th June Morning Shift
MCQ (Single Correct Answer)
+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 :
4
JEE Main 2022 (Online) 25th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
If wattless current flows in the AC circuit, then the circuit is :
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