List of top Physics Questions

Match List I with List II
LIST ILIST II
AVoltage StabilityIPower system stabilizer
BTransient stabilityIIDamping Power
COscillatory instabilityIIIAngle stability
DStudy-state dynamicsIVReactive power
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Choose the correct statements.
A. In CSI input current is Variable.
B. CSI requires feedback diodes.
C. Both controlled and uncontrolled switches are used in CSI.
D. CSI does not require filters.
E. CSI circuit requires large inductance.
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What is the change in entropy when 10 g of ice at 0 °C is converted into water at the same temperature? The latent heat of ice is 80 cal/g.
What will be the separation between the coherent sources formed by a bi-prism whose inclined faces makes an angle of 2° with its base, the slit source being 0.10 m away from the bi-prism (Given μ = 1.5)?
Consider the correct statements in respect of the thermoelectric instruments. The correct sequence is:
A. They indicate the rms value of current or voltage
B. They suffer from waveforms errors
C. They can be used for frequency range of the order of MHz
D. They have a low overload capacity
E. They have a high accuracy
Choose the correct answer from the options given below:
Angular width of central maxima of a diffraction pattern of a single slit does not depend upon
In a fixed-bias common-emitter Circuit.
A. Maintaining \(I_B\) constant will not provide operating-point stability as ẞ changes.
B. IB should not be allowed to change as to maintain \(V_{CB}\) and \(I_C\), constant as ẞ changes.
C. The reverse saturation current Ico doubles for every 10 °C rise in temperature.
D. The value of stability factor \(S=(1+\beta)\)
E. The circuit is highly unstable
Given \(\overrightarrow A\)x \(\overrightarrow B\) = \(\overrightarrow C\),
Where \(\overrightarrow A = x\hat i+y\hat j+3\hat k\), \(\overrightarrow B = y\hat î + x\hat j + 2\hat k\), \(\overrightarrow C=-5\hat î+5\hat k\) 
Find the value of x and y
If the stream function equation y=3x2-y2, what is the magnitude of velocity at point (2.2)?
When bullet is fired from a gun, its potential energy is converted into ____ .
Find the output voltage of a non-inverting OP-AMP having \(R_1\) = 100 kΩ, \(R_f\) = 500 kΩ, when the input signal is of 2.0 V.
If the wind speed at a site is 6 m/s for half of the year and 10 m/s for the rest of the year calculate the energy content in a year.
Which of the following statements is/ an false?
(A) Solder is an alloy of tin and lead.
(B) Ductile materials result in continuous chip with Built up edge.
(C) Stellites are alloys of cobalt, chromium and vanadium.
(D) Electron beam machining does not require vaccum.
(E) In Plasma arc maching, MRR [Material Removal Rate] is higher then EDM and laser machining.
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Choose the incorrect statement about Atomic absorption spectrometer:
If \(\hat{n_1}, \hat{n_2}\)are two unit vectors and \(\theta\) is the angle between them, then \(\cos\frac{\theta}{2}\) is equal to
The unit vectors orthogonal to the vector\(-\hat{i}+2\hat{j}+2\hat{k}\) and making equal angles with the x and y axis is (are)
If W is weight of the chain, L is span and P is tension or pull, then sag correction for chain line will be.
Match List I with List II
LIST I (Type of Device)LIST II (Characteristics/ Application)
AGTOITriggering Circuit
BUJTIITurn off by negative pulse rate
CTRIACIIIHigh Speed Switching
DMOSFETIVBidirectional Switching
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If \(I_0\) is the intensity of the principal maxima in a single slit diffraction pattern, then what will be its intensity when the slit width is doubled?
Figure shows Fraunhofer's diffraction due to a single slit. If first minima is obtained in the direction shown, then the path difference between ray 1 and ray 3 is
Rays
The Bose-Einstein distribution is applied on
Five Carnot engines operate between reservoir temperatures of
A. 100 K and 500 K
B. 200 K and 500 K 
C. 400 K and 500 K 
D. 200 K and 800 K
E. 200 K and 400 K 
Arrange the engines according to their decreasing efficiencies.
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A white dwarf star has volume V and contains N electrons so that the density of electron is \(n=\frac{N}{V}\). Taking the temperature of the star to be 0 K, what will be the expression for average energy per electron in the star?
In terms of total primary energy consumption. At present India stands at what position?
The two lines AB and CD shown in h-s curve are, respectively: