Electric power is transmitted over long distances through conducting wires at high voltage because
|
(a) High voltage travels faster |
|
(b) Power loss is large |
|
(c) Power loss is less |
|
(d) Generator produced electrical energy at a very high voltage |
(c) Power loss is less
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Great bear is a
|
(a) Star |
(b) Galaxy |
(c) Constellation |
(d) Planet |
A magnet of magnetic moment M oscillating freely in earth's horizontal magnetic field makes n oscillations per minute. If the magnetic moment is quadrupled and the earth's field is doubled, the number of oscillations made per minute would be
(a) 
|
(b) 
|
(c) 2
|
(d)
|
A wire of length L metre carrying a current of I ampere is bent in the form of a circle. Its magnitude of magnetic moment will be
|
(a) |
(b) |
(c) |
(d) |
$\text{y}=\text{a}_1\sin\omega\text{t}$
$\text{y}=\text{a}_2\sin(\omega\text{t}+\in)$
$\text{y}=\text{a}_1\sin2\omega\text{t}$
$\text{y}=\text{a}_2\sin2(\omega\text{t}+\in)$
The ratio of thermionic currents (I/I0) for a metal when the temperature is slowly increased 
to T as shown in figure. (I and I0 are currents at T and respectively). Then which one is correct?
| (a) A | (b) B | (c) C | (d) D |
Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1, 2), (2, 4) and (4, 1) show electrostatic attraction, while pair (2, 3) and (4, 5) show repulsion. Therefore ball 1 must be
|
(a) Positively charged |
(b) Negatively charged |
(c) Neutral |
(d) Made of metal |
The potential difference across the 100 W resistance in the following circuit is measured by a voltmeter of 900 W resistance. The percentage error made in reading the potential difference is
|
(a) |
(b) 0.1 |
(c) 1.0 |
(d) 10.0 |
A current i ampere flows in a circular arc of wire whose radius is R, which subtend an angle 3π/2 radian at its centre. The magnetic induction B at the centre is
|
(a) |
(b) |
(c) |
(d) |
