- AStationary.
- BNo.
- CAttractive.
- DAll.
Explanation:
The stationary charge (i.e static electricity) is produced by friction.
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The north pole of a magnet is brought near a metallic ring. The direction of the induced current in the ring will be
|
(a) Clockwise |
(b) Anticlockwise |
(c) Towards north |
(d) Towards south |
Unit of magnetic flux density (or magnetic induction) is
| (a) Tesla | (b) Weber/metre2 |
| (c) Newton/ampere-metre | (d) All of the above |
The current passing through a choke coil of 5 henry is decreasing at the rate of 2 ampere/sec. The e.m.f. developing across the coil is
|
(a) 10 V |
(b) – 10 V |
(c) 2.5 V |
(d) – 2.5 V |
The resistance of a wire is R. If the length of the wire is doubled by stretching, then the new resistance will be
|
(a) 2R |
(b) 4R |
(c) R |
(d) |
In helium nucleus, there are
|
(a) 2 protons and 2 electrons |
(b) 2 neutrons, 2 protons and 2 electrons |
|
(c) 2 protons and 2 neutrons |
(d) 2 positrons and 2 protons |
An interference pattern was made by using red light. If the red light changes with blue light, the fringes will become
|
(a) Wider |
(b) Narrower |
(c) Fainter |
(d) Brighter |