Copper and Germanium are cooled from room temperature to 100 K. Then, the resistance of
germanium increases, copper increases
germanium decreases, copper increases
germanium decreases, copper decreases
germanium increases, copper decreases
The following truth table with A and B as inputs is for ....... gate
NOR
AND
OR
XOR
D.
XOR
For an XOR gate, output is high when odd number of inputs are high.
In which of the following statements, the obtained impure semiconductor is of p-type ?
Germanum is doped with bismuth
Silicon is doped with antimony
Germanium is doped with gallium
Silicon is doped with phosphorus
The width of the depletion region in a p-n junction diode is
increased by reverse bias
increased by forward bias
decreased by reverse bias
independent of the bias voltage
When the transistor is used as an amplifier
Emitter-base junction must be reverse biased, Collector-base junction must be forward
Emitter-base junction must be forward biased, Collector-base Junction must be forward biased
Emitter-base junction must be reverse biased, Collector-base junction must be reverse biased
Emitter-base junction must be forward biased, Collector-base junction must be reverse biased
The output of an OR gate is connected to both the inputs of a NAND gate. The combination will serve as
AND gate
NOT gate
NAND gate
NOR gate
In n-type semiconductor, electrons are majority charge carriers but it does not show any negative charge. The reason is
electrons are stationary
electrons neutralize with holes
mobility of electrons is extremely small
atom is electrically neutral
For the given digital circuit, write the truth table and identify the logic gate it represents
OR gate
NOR gate
NAND gate
AND gate