MHT CET 2021 20th September Morning Shift | Semiconductor Devices and Logic Gates Question 53 | Physics

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

$$\mathrm{\frac{N}{4}}$$

$$\mathrm{\frac{N}{2}}$$

MHT CET 2021 20th September Morning Shift

MCQ (Single Correct Answer)

-0

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

increases in both copper and silicon

decreases in both copper and silicon

decreases in copper and increases in silicon

increases in copper and decreases in silicon

MHT CET 2020 16th October Morning Shift

MCQ (Single Correct Answer)

-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

$$3 \times 10^{-4} \mathrm{~A}$$

$$0.5 \times 10^{-4} \mathrm{~A}$$

$$2 \times 10^{-5} \mathrm{~A}$$

$$1 \times 10^{-5} \mathrm{~A}$$

MHT CET 2020 16th October Morning Shift

MCQ (Single Correct Answer)

-0

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

may increase or decrease depending upon the percentage of doping

increases

decreases

does not change

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