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Semiconductor

NEET Physics · 93 questions · Page 10 of 10 · Click an option or "Show Solution" to reveal answer

Q91
The current in the circuit will be
A 5/40 A
B 5/50 A
C 5/10 A
D 5/20 A
Correct Answer
Option B
Solution

D 1 is reverse biased and D 2 is forward biased. ∴\therefore I =

530+20{5 \over {30 + 20}}

=

550{5 \over {50}}

A

Q92
The cations and anions are arranged in alternate form in
A metallic crystal
B ionic crystal
C covalent crystal
D semi-conductor crystal.
Correct Answer
Option B
Solution

In an Ionic crystal, the cations and anions are arranged in alternate form.

Q93
The correct relation for α\alpha , β\beta for a transistor
A β=1−αα\beta = {{1 - \alpha } \over \alpha }
B β=α1−α\beta = {\alpha \over {1 - \alpha }}
C α=β−1β\alpha = {{\beta - 1} \over \beta }
D αβ=1\alpha \beta = 1
Correct Answer
Option B
Solution

β\beta =

ICIB{{{I_C}} \over {{I_B}}}

=

ICIE−IC{{{I_C}} \over {{I_E} - {I_C}}}

=

ICIE1−ICIE{{{{{I_C}} \over {{I_E}}}} \over {1 - {{{I_C}} \over {{I_E}}}}}

=

α1−α{\alpha \over {1 - \alpha }}
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