The following truth table belongs to which of the following four gates?
NOR
XOR
NAND
OR
When a triode is used as an amplifier the phase difference between the input signal voltage and the output is
zero
In a junction diode, the holes are due to
protons
extra electrons
neutrons
missing electrons
Which of the following, when added as an impurity, into the silicon, produces n-type semiconductor?
Phosphorus
Aluminium
Magnesium
Both (b) and (c)
At absolute zero, Si acts as
non-metal
metal
insulator
None of these
The current gain for a transistor working as common base amplifier is 0.96. If the emitter current is 7.2 mA, then the base current is
0.29 mA
0.35 mA
0.39 mA
0.43 mA
A semiconducting device is connected in a series in circuit with a battery and a resistance. A current is allowed to pass through the circuit. If the polarity of the battery is reversed, the current drios to almost zero. The device may be
a p-n junction
an intrinsic semiconductor
a p-type semiconductor
an n-type semiconductor
Which one of the following is the weakest kind of the bonding in solids?
Ionic
Metallic
Van der Waals'
Covalent
To obtain a p-type germanium semiconductor, it must be doped with
phosphorus
indium
antimony
arsenic
Radiowaves of constant amplitude can be generated with
FET
filter
rectifier
oscillator