While a collector to emitter voltage is constant in a transistor, the collector current changes by 8.2 mA when the emitter current changes by 8.3 mA. The value of forward current ratio hfe is
|
(a) 82 |
(b) 83 |
(c) 8.2 |
(d) 8.3 |
(a) 82
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If radius of the 
nucleus is estimated to be 3.6 Fermi then the radius of 
nucleus be nearly
| (a) 4 Fermi | (b) 5 Fermi | (c) 6 Fermi | (d) 8 Fermi |
The coordination number of Cu is
|
(a) 1 |
(b) 6 |
(c) 8 |
(d) 12 |
Variation of current passing through a conductor as the voltage applied across its ends as varied is shown in the adjoining diagram. If the resistance (R) is determined at the points A, B, C and D, we will find that
|
(a) RC = RD |
(b) RB > RA |
(c) RC > RB |
(d) None of these |
The velocity factor of a transmission line x. If dielectric constant of the medium is 2.6, the value of x is
|
(a) 0.26 |
(b) 0.62 |
(c) 2.6 |
(d) 6.2 |
A steady current i is flowing through a conductor of uniform cross-section. Any segment of the conductor has
|
(a) Zero charge |
(b) Only positive charge |
|
(c) Only negative charge |
(d) Charge proportional to current i |
For what value of unknown resistance X, the potential difference between B and D will be zero in the circuit shown in the figure
|
(a) 4 W |
(b) 6 W |
(c) 2 W |
(d) 5 W |
The output of a NAND gate is 0
|
(a) If both inputs are 0 |
|
(b) If one input is 0 and the other input is 1 |
|
(c) If both inputs are 1 |
|
(d) Either if both inputs are 1 or if one of the inputs is 1 and the other 0 |
The intensity of electric field required to balance a proton of mass 1.7 
and charge 1.6 
is nearly
|
(a) |
(b) 1 |
(c) 1 |
(d) 1 |
