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1
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
2
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
3
MHT CET 2021 21th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

Combination of NAND gates is shown in the figure. It is equivalent to

MHT CET 2021 21th September Evening Shift Physics - Semiconductor Devices and Logic Gates Question 72 English

A
AND gate
B
NOR gate
C
OR gate
D
X-OR gate
4
MHT CET 2021 21th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

In an ideal junction diode, the current flowing through PQ is

MHT CET 2021 21th September Evening Shift Physics - Semiconductor Devices and Logic Gates Question 70 English

A
2 $$\times$$ 10$$^{-3}$$ A
B
2 $$\times$$ 10$$^{-2}$$ A
C
4 $$\times$$ 10$$^{-3}$$ A
D
10$$^{-3}$$ A
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