A triode whose mutual conductance is 2.5 m A/volt and anode resistance is 20 kilo ohm, is used as an amplifier whose amplification is 10. The resistance connected in plate circuit will be
|
(a) 1 kW |
(b) 5 kW |
(c) 10 kW |
(d) 20 kW |
(b) 5 kW
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Two capacitances of capacity 
and 
are connected in series and potential difference V is applied across it. Then the potential difference across will be
|
(a) |
(b) |
(c) |
(d) |
The transistors provide good power amplification when they are used in
|
(a) Common collector configuration |
(b) Common emitter configuration |
|
(c) Common base configuration |
(d) None of these |
Three resistances of magnitude 2, 3 and 5 ohm are connected in parallel to a battery of 10 volts and of negligible resistance. The potential difference across 3 Ω resistance will be
|
(a) 2 volts |
(b) 3 volts |
(c) 5 volts |
(d) 10 volts |
The sodium nucleus 
contains
|
(a) 11 electrons |
(b) 12 protons |
(c) 23 protons |
(d) 12 neutrons |
The distance between the plates of a parallel plate condenser is 8mm and P.D. 120 volts. If a 6mm thick slab of dielectric constant 6 is introduced between its plates, then
|
(a) The charge on the condenser will be doubled |
|
(b) The charge on the condenser will be reduced to half |
|
(c) The P.D. across the condenser will be 320 volts |
|
(d) The P.D. across the condenser will be 45 volts |
