The Schmitt-trigger is a circuit which creates hystereses and which is useful in digitizing an analog signal into a digital signal of either high or low. The hystereses makes inputs more immune to noise. The input must surpass a low threshold voltage before the output goes low, and likewise the input must exceed a high level threshold before the output goes high. The output stays at the previous level, when the input is in the intermediate range, between the high and low thresholds. Many digital circuits and microprocessor inputs use Schmitt ....etc

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physics practical viva questions for bsc

Q.1: Define surface tension?
Ans. The tangential cohesive force acting along the unit length of the surface of a liquid
T = F / L
Where F = total force along a line
L = length of the line
In this experiment:
F = m g = weight of the pan + weight in the pan.
L = 2 (length of the slide) + 2 (breadth of the slide).
Sometime we neglect the breadth since it is very small.

Q.2: What are units of surface tension in C.G.S. and S.I. (M.K.S.) system?
Ans. Dynes / cm (C.G.S.)
Newton / meter (M.K.S.)

Q.3: What ....etc

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1. What is semi conductor diode laser?

Semiconductor diode laser is a specially fabricated pn junction diode. It emits laser light when it is
forward biased.

2. What is LASER?

The term LASER stands for Light Amplification by Stimulated Emission of Radiation. It is a device
which produces a powerful, monochromatic collimated beam of light in which the waves are coherent.

3. What are the characteristic of laser radiation?

Laser radiations have high intensity, high coherence, high monochoromation and high directionality
with less divergence.
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ABOUT THE BOOK:
This book is designed to meet the course on Engineering Physics Practical of engineering curriculum for the First Year engineering students.
Laboratory work is an important part of the process of learning physics where students apply their knowledge practically.
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