AIEEE 2005 | Semiconductor Question 193 | Physics

The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than $$2480$$ $$nm$$ is incident on it. The band gap in $$(eV)$$ for the semiconductor is

$$2.5$$ $$eV$$

$$1.1$$ $$eV$$

$$0.7$$ $$eV$$

$$0.5$$ $$eV$$

AIEEE 2005

MCQ (Single Correct Answer)

-1

In a full wave rectifier circuit operating from $$50$$ $$Hz$$ mains frequency, the fundamental frequency in the ripple would be

$$25$$ $$Hz$$

$$50$$ $$Hz$$

$$70.7$$ $$Hz$$

$$100$$ $$Hz$$

AIEEE 2005

MCQ (Single Correct Answer)

-1

Out of Syllabus

In a common base amplifier, the phase difference between the input signal voltage and output voltage is

$$\pi $$

$${\pi \over 4}$$

$${\pi \over 2}$$

$$0$$

AIEEE 2004

MCQ (Single Correct Answer)

-1

Out of Syllabus

When $$npn$$ transistor is used as an amplifer

electrons move from collector to base

holes move from emitter to base

electrons move from base to collector

holes move from base to emitter

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