1
JEE Main 2021 (Online) 27th August Evening Shift
+4
-1
Out of Syllabus
For a transistor $$\alpha$$ and $$\beta$$ are given as $$\alpha = {{{I_C}} \over {{I_E}}}$$ and $$\beta = {{{I_C}} \over {{I_B}}}$$. Then the correct relation between $$\alpha$$ and $$\beta$$ will be :
A
$$\alpha = {{1 - \beta } \over \beta }$$
B
$$\beta = {\alpha \over {1 - \alpha }}$$
C
$$\alpha \beta = 1$$
D
$$\alpha = {\beta \over {1 - \beta }}$$
2
JEE Main 2021 (Online) 27th August Morning Shift
+4
-1
Out of Syllabus
For a transistor in CE mode to be used as an amplifier, it must be operated in :
A
Both cut-off and Saturation
B
Saturation region only
C
Cut-off region only
D
The active region only
3
JEE Main 2021 (Online) 26th August Evening Shift
+4
-1
Four NOR gates are connected as shown in figure. The truth table for the given figure is :

A
B
C
D
4
JEE Main 2021 (Online) 26th August Morning Shift
+4
-1
Identify the logic operation carried out by the given circuit :-

A
OR
B
AND
C
NOR
D
NAND
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