A common emitter amplifier is designed with NPN transistor (a = 0.99). The input impedance is 1 KW and load is 10 KW. The voltage gain will be
|
(a) 9.9 |
(b) 99 |
(c) 990 |
(d) 9900 |
(c) 990
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When the current flowing in a circular coil is doubled and the number of turns of the coil in it is halved, the magnetic field at its centre will become
|
(a) Four times |
(b) Same |
(c) Half |
(d) Double |
Magnetic permeability is maximum for
|
(a) Diamagnetic substance |
(b) Paramagnetic substance |
|
(c) Ferromagnetic substance |
(d) All of these |
Which one of the following nuclear reactions is a source of energy in the sun
|
(a) |
|
(b) |
|
(c) |
|
(d) |
Putting a dielectric substance between two plates of condenser, capacity, potential and potential energy respectively
|
(a) Increase, decrease, decrease |
(b) Decrease, increase, increase |
|
(c) Increase, increase, increase |
(d) Decrease, decrease, decrease |
In Bohr model of the hydrogen atom, the lowest orbit corresponds to
|
(a) Infinite energy |
(b) The maximum energy |
|
(c) The minimum energy |
(d) Zero energy |
