1
MHT CET 2021 22th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

Choose the correct statement. In semiconductors valance band and conduction band

A
is separated by large energy gap.
B
is separated by small energy gap:
C
is almost empty.
D
overlap each other.
2
MHT CET 2021 22th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

A logic gate which gives output 'HIGH' only when its two input terminals are at different logic levels with respect to each other is

A
NOR gate
B
OR gate
C
AND gate
D
X-OR gate
3
MHT CET 2021 22th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

Choose the FALSE statement from the following.

A
Generally, in conductors the valence and conducting bands overlap.
B
The resistivity of a semiconductor increases with increase in temperature
C
The conductivity of a semiconductor increase with increase in temperature
D
Substances with energy gap of the order of $$10 \mathrm{~eV}$$ are insulators
4
MHT CET 2021 22th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

In an n-p-n transistor 200 electrons enter the emitter in 10$$^{-8}$$ second. If 1% electrons are lost in the base, then the current that enters the emitter and the current amplification factor are respectively [e = 1.6 $$\times$$ 10$$^{-19}$$ C]

A
2 $$\times$$ 10$$^{-10}$$ A and 49
B
3.2 $$\times$$ 10$$^{-9}$$ A and 99
C
1.6 $$\times$$ 10$$^{-19}$$ A and 90
D
1.7 $$\times$$ 10$$^{-11}$$ A and 70
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