1
JEE Main 2021 (Online) 31st August Morning Shift
+4
-1
In the following logic circuit the sequence of the inputs A, B are (0, 0), (0, 1), (1, 0) and (1, 1). The output Y for this sequence will be :

A
1, 0, 1, 0
B
0, 1, 0, 1
C
1, 1, 1, 0
D
0, 0, 1, 1
2
JEE Main 2021 (Online) 31st August Morning Shift
+4
-1
Choose the correct waveform that can represent the voltage across R of the following circuit, assuming the diode is ideal one :

A
B
C
D
3
JEE Main 2021 (Online) 27th August Evening Shift
+4
-1
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
$$\alpha = {\beta \over {1 - \beta }}$$
4
JEE Main 2021 (Online) 27th August Morning Shift
+4
-1
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
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