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Examiner (E): What was the experiment allotted to you?

Students(S): Sir, I was assigned the experiment to determine the internal resistance of a primary cell using potentiometer.
E: OK, Tell me the principle of a potentiometer

S: Sir. The principle of a potentiometer is that the potential drop across any length of a wire of uniform cross section and composition and carrying a constant current is directly proportional to the length.
E: Good. What is internal resistance?

S: The resistance offered by the electrodes and electrolyte of a ....etc

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1. Under which category Magnetic, electrostatic and gravitational forces come? Non-contact forces
2. No matter how far you stand from a mirror, your image appears erect, How is the mirror likely to be? Either plane or convex
3. Due to which Phenomenon are advanced sunrise and delayed sunset found in the sky? Refraction of sunlight
4. Due to which Phenomenon is the formation of colours in soap bubbles? Interference of light
5. On which principle a pressure cooker works? Elevation of boiling point of water by application of pressure
6. ....etc

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It is impossible to do an experimental measurement with perfect accuracy. There is
always an uncertainty associated with any measured quantity in an experiment even
in the most carefully done experiment and despite using the most sophisticated
instruments. This uncertainty in the measured value is known as the error in that
particular measured quantity. There is no way by which one can measure a quantity
with one hundred percent accuracy. In presenting experimental results it is very
important to objectively estimate the error in the meas ....etc

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Physics Lab Viva Voce Questions and its answers Laser Parameters



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 ....etc

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In optics, a diffraction grating is an optical component with a periodic structure, which splits and diffracts light into several beams travelling in different directions. The emerging coloration is a form of structural coloration. The directions of these beams depend on the spacing of the grating and the wavelength of the light so that the grating acts as the dispersive element. Because of this, gratings are commonly used in monochromators and spectrometers.

For practical applications, gratings generally have ridges or rulings on their sur ....etc

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