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1
MHT CET 2026 18th April Evening Shift
MCQ (Single Correct Answer)
+1
-0
In an NPN transistor, the collector current is 28 mA. If 80% electrons reach the collector, its base current in mA is
A
$7$ mA
B
$14$ mA
C
$28$ mA
D
$35$ mA
2
MHT CET 2026 18th April Evening Shift
MCQ (Single Correct Answer)
+1
-0
The output Y of the given logic circuit is
MHT CET 2026 18th April Evening Shift Physics - Semiconductor Devices and Logic Gates Question 34 English
A
$\overline{(A \cdot B)} + \overline{(C \cdot B)}$
B
$\overline{(A + B)} \cdot \overline{(B \cdot C)}$
C
$\overline{(A \cdot B)} + \overline{(B + C)}$
D
$(A + B) + (B + C)$
3
MHT CET 2026 18th April Evening Shift
MCQ (Single Correct Answer)
+1
-0
For intrinsic semiconductor, if $n_h$ and $n_e$ represent the number of holes per unit volume and the number of free electrons per unit volume respectively then
A
$n_h < n_e$
B
$n_h > n_e$
C
$n_h = n_e$
D
$n_h \neq n_e$
4
MHT CET 2026 18th April Morning Shift
MCQ (Single Correct Answer)
+1
-0
Which one of the following statements is 'WRONG' regarding LED?
A
LED's have long lifetime if properly manufactured.
B
Colours produced by LED's do not fade out.
C
LED's are energy efficient.
D
Brightness of light emitted by LED cannot be controlled.
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