# Semiconductor Electronics Materials Devices And Simple Circuits

## A circuit of logic gates given below, some input signal A, B, C are given with their output signal x, y and z is given in respective option, choose correct options :

A
If then
B
If and then
C
If and then
D
If OR gate is replaced by NOR gate then net output signal of the circuit becomes for the input and .
Hard
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Assertion

Reason

## STATEMENT-2 : If output of a AND gate is fed to NOT gate, it is called NAND gate.

A
Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1
B
Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1
C
Statement-1 is True, Statement-2 is False.
D
Statement-1 is False, Statement-2 is True.
Hard
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## A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of:

A
each of them increases
B
each of them decreases
C
copper increases and germanium decreases
D
copper decreases and germanium increases.
Hard
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