- A$\Omega\text{m}^{-1}$
- B$\Omega^{-1}\text{m}^{-1}$
- C$\Omega1$
- D$2.5-\text{m}^2$
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In NPN transistor the collector current is 10 mA. If 90% of electrons emitted reach the collector, then
|
(a) Emitter current will be 9 mA |
(b) Emitter current will be 11.1 mA |
|
(c) Base current will be 0.1 mA |
(d) Base current will be 0.01 mA |
An under water swimmer is at a depth of 12 m below the surface of water. A bird is at a height of 18 m from the surface of water, directly above his eyes. For the swimmer the bird appears to be at a distance from the surface of water equal to (Refractive Index of water is 4/3)
|
(a) 24 m |
(b) 12 m |
(c) 18 m |
(d) 9 m |

The maximum intensity of fringes in Young's experiment is I. If one of the slit is closed, then the intensity at that place becomes Io. Which of the following relation is true ?
|
(a) I = Io |
(b) I = 2Io |
|
(c) I = 4Io |
(d) There is no relation between I and Io |
The frequency of a FM transmitter without signal input is called
|
(a) Lower side band frequency |
(b) Upper side band frequency |
|
(c) Resting frequency |
(d) None of these |
A cube of side b has a charge q at each of its vertices. The electric field due to this charge distribution at the centre of this cube will be
|
(a) |
(b) |
(c) |
(d) Zero |
A varying current at the rate of 3 A/s in a coil generates an e.m.f. of 8 mV in a nearby coil. The mutual inductance of the two coils is
|
(a) 2.66 mH |
(b) 2.66 |
(c) 2.66 H |
(d) 0.266 H |
