1
MHT CET 2021 24th September Evening Shift
+1
-0

For a transistor, the current ratio $$\alpha_{\mathrm{dc}}=\frac{69}{70}$$, the current gain $$\beta_{\mathrm{dc}}$$ is

A
67
B
69
C
71
D
66
2
MHT CET 2021 24th September Evening Shift
+1
-0

The input a.c. voltage of frequency $$60 \mathrm{~Hz}$$ is applied to half-wave rectifier and also to full-wave rectifier. The output frequency in case of half-wave rectifier and that in case of full wave rectifier is respectively.

A
120 Hz, 60 Hz
B
60 Hz, 120 Hz
C
60 Hz, 60 Hz
D
120 Hz, 120 Hz
3
MHT CET 2021 24th September Morning Shift
+1
-0

A p-n junction photodiode is fabricated from a semiconductor with a band gap of $$2.5 \mathrm{~eV}$$. It can detect a signal of wavelength [Planck's constant $$=6.6 \times 10^{-34} \mathrm{Js}, \mathrm{c}=3 \times 10^8 \mathrm{~m} / \mathrm{s}, \mathrm{e}=1.6 \times 10^{-19} \mathrm{C}$$]

A
6000 nm
B
6000 $$\mathop A\limits^o$$
C
5000 $$\mathop A\limits^o$$
D
4000 nm
4
MHT CET 2021 24th September Morning Shift
+1
-0

For the output of the following logic circuit to be 'I', the values of inputs A and B should be respectively

A
0 and 1
B
0 and 0
C
1 and 1
D
1 and 0
EXAM MAP
Medical
NEET