- ✓Constant
- BZero
- CInfinity
- DDepends on magnetic field
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Energy released in the fission of a single
nucleus is 200 MeV. The fission rate of a
fuelled reactor operating at a power level of 5W is
|
(a) 1.56 |
(b) 1.56 |
(c) 1.56 |
(d) 1.56 |
If rotational velocity of a dynamo armature is doubled, then induced e.m.f. will become
|
(a) Half |
(b) Two times |
(c) Four times |
(d) Unchanged |
Two electric bulbs whose resistances are in the ratio of 1 : 2 are connected in parallel to a constant voltage source. The powers dissipated in them have the ratio
|
(a) 1 : 2 |
(b) 1 : 1 |
(c) 2 : 1 |
(d) 1 : 4 |
A long solenoid of length L has a mean diameter D. It has n layers of windings of N turns each. If it carries a current ‘i’ the magnetic field at its centre will be
|
(a) Proportional to D |
(b) Inversely proportional to D |
|
(c) Independent of D |
(d) Proportional to L |
When a wire of uniform cross-section a, length l and resistance R is bent into a complete circle, resistance between any two of diametrically opposite points will be
|
(a) |
(b) |
(c) 4R |
(d) |
The frequencies of X-rays, g-rays and ultraviolet rays are respectively a, b and c. Then
|
(a) a < b, b > c |
(b) a > b, b > c |
(c) a > b, b < c |
(d) a < b, b < c |