Explanation:
A Van de Graff generator, by means of a moving belt and suitable brushes, transfers charge continuously to a large spherical conducting shell. As a result, a potential difference of the order of several million volts is built up and this can be used for accelerating charged particles.
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In a step up transformer, 220 V is converted into 200 V. The number of turns in primary coil is 600. What is the number of turns in the secondary coil
|
(a) 60 |
(b) 600 |
(c) 6000 |
(d) 100 |
A rod of a certain metal is 1.0 m long and 0.6 cm in diameter. Its resistance is 3.0 × 
ohm. Another disc made of the same metal is 2.0 cm in diameter and 1.0 mm thick. What is the resistance between the round faces of the disc
|
(a) 1.35 × |
(b) 2.70 × |
(c) 4.05 × |
(d) 8.10 × |
Two plane mirrors are at right angles to each other. A man stands between them and combs his hair with his right hand. In how many of the images will he be seen using his right hand
| (a) None | (b) 1 | (c) 2 | (d) 3 |
The unit of electric field is not equivalent to
|
(a) N/C |
(b) J/C |
(c) V/m |
(d) J/C - m |
Two batteries A and B each of e.m.f. 2 V are connected in series to an external resistance R = 1 ohm. If the internal resistance of battery A is 1.9 ohms and that of B is 0.9 ohm, what is the potential difference between the terminals of battery A
|
(a) 2 V |
(b) 3.8 V |
(c) Zero |
(d) None of the above |
An ammeter of 100 W resistance gives full deflection for the current of 10–5 amp. Now the shunt resistance required to convert it into ammeter of 1 amp. range, will be
|
(a) |
(b) |
(c) |
(d) |
de-Broglie wavelength of a body of mass 1 kg moving with velocity of 2000 m/s is
|
(a) 3.32 × 10–27 Å |
(b) 1.5 × 107 Å |
(c) 0.55 × 10–22 Å |
(d) None of these |
