1
MHT CET 2021 20th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

The frequency of a given a.c. signal is 'N' Hz. When it is connected to a half wave rectifier, the number of output pulses given by the rectifier in 1 second is

A
$$\mathrm{\frac{N}{4}}$$
B
$$\mathrm{\frac{N}{2}}$$
C
N
D
2N
2
MHT CET 2021 20th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

Silicon and copper are cooled from 300 K to 100 K, the specific resistance (resistivity)

A
increases in both copper and silicon
B
decreases in both copper and silicon
C
decreases in copper and increases in silicon
D
increases in copper and decreases in silicon
3
MHT CET 2020 16th October Morning Shift
MCQ (Single Correct Answer)
+1
-0

In common emitter amplifier, input resistance is $$1000 \Omega$$, peak value of input signal voltage is $$5 \mathrm{~mV}$$ and $$\beta=60$$. The peak value of output current is

A
$$3 \times 10^{-4} \mathrm{~A}$$
B
$$0.5 \times 10^{-4} \mathrm{~A}$$
C
$$2 \times 10^{-5} \mathrm{~A}$$
D
$$1 \times 10^{-5} \mathrm{~A}$$
4
MHT CET 2020 16th October Morning Shift
MCQ (Single Correct Answer)
+1
-0

When a small amount of impurity atoms are added to a semiconductor, then generally its resistivity

A
may increase or decrease depending upon the percentage of doping
B
increases
C
decreases
D
does not change
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