MCQ
A capacitor is connected to an A.C. circuit, then the phase difference between current and the voltage is:
- A$\pi$
- B$\frac{\pi}{2}$
- C$\frac{-\pi}{2}$
- D$\text{Zero}$
✓
Answer
- $\frac{\pi}{2}$
Explanation:
Current leads voltage by $\frac{\pi}{2}$
$\therefore$ phase difference is $=\frac{\pi}{2}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Which of the following is responsible for the earth’s magnetic field?
Albedo is maximum for
|
(a) Pluto |
(b) Venus |
(c) Earth |
(d) Mercury |
The process by which a heavy nucleus splits into light nuclei is known as
|
(a) Fission |
(b) α- decay |
(c) Fusion |
(d) Chain reaction |
In water voltameter, the electrolysis of ...... takes place
|
(a) |
(b) |
(c) |
(d) |
Which of the following cannot be seen by a microscope?
In a wire of circular cross-section with radius r, free electrons travel with a drift velocity V when a current I flows through the wire. What is the current in another wire of half the radius and of the same material when the drift velocity is 2V
|
(a) 2I |
(b) I |
(c) I/2 |
(d) I/4 |
A deutron is bombarded on 
nucleus and a-particle is emitted. The product nucleus is
|
(a) |
(b) |
(c) |
(d) |
When a voltage measuring device is connected to AC mains, the meter shows the steady input voltage of 220V. This means,
A coil has an inductance of 0.7 H and is joined in series with a resistance of $220\Omega$ When an alternating emf of 220V at 50 cps is applied to it, then the wattless component of the current in the circuit is $(\text{take }0.7\pi=2.2)$
→Match the List I with the List II from the combinations shown
|
(I) |
Presbiopia |
(A) |
Sphero-cylindrical lens |
|
(II) |
Hypermetropia |
(B) |
Convex lens of proper power may be used close to the eye |
|
(III) |
Astigmatism |
(C) |
Concave lens of suitable focal length |
|
(IV) |
Myopia |
(D) |
Bifocal lens of suitable focal length |
|
(a) I-A; II-C; III-B; IV-D |
(b) I-B; II-D; III-C; IV-A |
(c) I-D; II-B; III-A; IV-C |
(d) I-D; II-A; III-C; IV-B |