17-03-2016, 09:28 AM
volume resonator viva queations
thank u so muuch
17-03-2016, 09:28 AM
volume resonator viva queations thank u so muuch
05-04-2016, 04:56 PM
physics experiments viva questions in volume resonator with answers
"A Helmholtz resonator or Helmholtz oscillator is a container of gas (usually air) with an open hole (or neck or port). A volume of air in and near the open hole vibrates because of the 'springiness' of the air inside. A common example is an empty bottle: the air inside vibrates when you blow across the top, as shown in the diagram at left. (It's a fun experiment, because of the surprisingly low and loud sound that results.) "Some small whistles are Helmholtz oscillators. The air in the body of a guitar acts almost like a Helmholtz resonator*. An ocarina is a slightly more complicated example. Loudspeaker enclosures often use the Helmholtz resonance of the enclosure to boost the low frequency response." "…The vibration here is due to the 'springiness' of air: when you compress it, its pressure increases and it tends to expand back to its original volume. Consider a 'lump' of air at the neck of the bottle (shaded in the middle diagrams). The air jet can force this lump of air a little way down the neck, thereby compressing the air inside. That pressure now drives the 'lump' of air out but, when it gets to its original position, its momentum takes it on outside the body a small distance. This rarifies the air inside the body, which then sucks the 'lump' of air back in. It can thus vibrate like a mass on a spring (diagram at right). The jet of air from your lips is capable of deflecting alternately into the bottle and outside, and that provides the power to keep the oscillation going."
19-07-2016, 11:22 AM
viva questions physics laboratory class 11 with answers
1. VERNIER CALLIPER Q.1: What is vernier calipers? Ans. It is simple instrument by which length of an object can be measured accurately up to one-tenth of a millimeter or one-hundredth of a centimeter. Q.2: What is the use of Vernier Scale? Ans. To increase the accuracy of the main scale. Q.3: What is least count (L.C.)? Ans. The minimum measurement that can be taken by an instrument. Q.4: What is the least count of? (a) meter scale (b) Stop Watch © Vernier Calliper Ans. The least count of: (a) meter scale = 0.1 cm or 1 mm. (b) stop watch = 0.01 sec or 1/100 sec. or according to stop watch. © vernier scale = 0.01 cm or 0.1 mm Q.5: What are units of vernier scale? Ans. Vernier has not units of its own. Q.6: What is the difference in the measurement of one smaller division on the main scale (M.S.) and that of vernier scale (V.S.) Ans. (1 smallest Div. on M.S.) – (1 smallest Div. on V.S) = 0.1 – 0.09 = 0.01 cm = Least count. Q.7: How the L.C. of a vernier is determined? Ans. By using the relation: L.C. = Smallest division on Main scale [[[ Total number of divisions on vernier scale Q.8: Will the accuracy of a vernier will increase or decrease if 20 divisions are made in the same length? Ans. The accuracy will increase since the L.C. will decrease i.e. Accuracy α 1 [[[[ Least count Q.9: Which one is smaller M.S. div. or V.S. div.? Ans. V.S. division. Q.10: 1 division on V.S. = _____ cm. Ans. 0.09 cm. 10 div. on V.S. = 0.9 cm 1 div. on V.S. = 0.9/10 cm = 0.09 cm Q.11: What are the functions of (a) Sliding strip (b) Upper jaws Ans. (a) For measuring depth. (b) For measuring the inner diameter. Q.12: What is meant by zero error (Z.E.)? Ans. The error which arises when zeros of M.S. and V.S. do not coincide upon joining the two jaws. Q.13: When Z.E. is positive? Ans. The Z.E. is positive when the zero of V.S. is to the right of the zero of M.S. Q.14: How we find the corrected reading? Ans. Corrected reading = Meaning reading – ( + Z.E.) Q.15: Do you know any use of vernier scale? Ans. It is used in spectrometer, barometer, traveling microscope, etc. Q.16: What are significant figures? Ans. Numbers 0, 1, 2, 3, ……. are called significant figures when they occur. The zero is not a significant figure if it is at the extreme left or extreme right of a number, e.g. 1.02 has three significant figures, but 1.20 has two significant figures. Q.17: What is meant by degree of accuracy? Ans. It is the measurement estimated by the number of significant figures in the result. Q.18: Why is the vernier calipers so called? Ans. A French mathematician named Pierre Vernier invented it and it is named after him. Q.19: How does temperature affect the length of a cylinder? Ans. The length of a cylinder increases with the increase of temperature and decreases with the decrease of temperature. Reference: https://seminarproject.net/Thread-viva-q...z4Epbr3JFP |
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