List of top Physics Questions

The pressure exerted by $5$ moles of a real gas in one litre vessel at $47^??$ is $(a = 3.592 \,atm\, L^2\, mol^{-2}$, $b = 0.0427\, L\, mol^{-1})$
The length of a seconds pendulum is
The mobility of free electrons (charge= e, mass= m and relaxation time = $\tau$) in a metal is proportional to
The minimum and maximum distance of a satellite from the center of earth is 2R and 4R respectively. Its maximum speed is
The maximum amplitude of an amplitude modulated wave is found to be $15\, V$ while its minimum amplitude is found to be $3 \,V$. The modulation index is
The hot wire instrument measures :
The heat of formation of water is 260 kJ. How much $H_2O$ is decomposed by 130 kJ of heat ?
The heat of neutralisation is maximum when
The gravitational field in a region is given by $\bar{E}=(4i+j)N/kg.$ Workdone this field is zero when a particle is moved along the line
The graph showing the dependence of intensity of transmitted light on the angle between polariser and analyser, is
The gravitational potential energy of a body in the gravitational field of earth is minimum
The force required to stretch a steel wire of $1\,s cm$ cross-section to $1.1$ times, its length would be ($Y=2 \times 10^ {11} Nm ^{-2}$).
The following configuration of gates is equivalent to
The figure below shows the plot of $\frac{pV}{nT}$ versus p for oxygen gas at two different temperatures. Read the following statements concerning the above curves (i) The dotted line corresponds to the 'ideal' gas behaviou (ii) $T_1 > T_2$ (iii) The value of $\frac{pV}{nT}$ at the point where the curves meet on the y-axis is the same for all gases. Which of the above statements is true?
The equivalent capacitance between the points A and B in the following circuit is:
The energy in monochromatic $X$ -rays of wavelength $1\, ?? is roughly equal to
The emitter of a transistor is doped the heaviest because it :
The emissive power of a perfectly black body is equal to
The emissive power of a surface depends upon
The displacements of two particles of same mass executing SHM are represented by the equations $ {{x}_{1}}=4\sin \left( 10t+\frac{\pi }{6} \right) $ and $ {{x}_{2}}=5\cos (\omega t) $ The value of co for which the energies of both the particles remain same is
The amplitude of a wave disturbance propagating in positive direction of $x-axis$ is given by $y=\frac{1}{1 + x^{2}}$ at $t=0$ and by $y=\frac{1}{1 + \left(x - 1\right)^{2}}$ at $t=2 \, s$ , where $x \, $ and $y$ are in meters. The shape of the wave disturbance does not change during propagation. The velocity of the wave is
A particle of mass $m$ is moved from the surface of the earth to a height $h$. The work done by an external agency to do this is (1) $m g h$ for $h < < R$ (3) $\frac{1}{2} m g h$ for $h=R$ (2) $m g h$ for all $h$ (4) $-\frac{1}{2} m g h$ for $h=R$
If the energy of a 100 $ \pi F $ capacitor charged to 6 kV could all be used to lift a 50 kg mass, hat would be the greatest vertical height through which mass could be raised?
Out of the following gases under similar condition of temperature and pressure, the velocity of sound will be maximum in
If the resistivity of pure silicon is $3000 \, \Omega m$ and the mobilities of electrons and holes are $0.12 \, m^{2}V^{- 1}s^{- 1}$ and $0.045 \, m^{2}V^{- 1}s^{- 1}$ respectively, then what will be the resistivity of a specimen of silicon when $10^{19}$ atoms of phosphorous are added per cubic metre?