Recent questions in Physics

Helium gas is filled vessel ( having negligible thermal expansion coefficeint ) when heated from 300 K to 600 K . Then the average kinetic energy of atom will be

asked Mar 31, 2014 by yamini.v

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At what temperature the molecule of nitrogen will have the same rms velocity as the molecule of oxygen at $\;127^{0}C\;$ ?

asked Mar 31, 2014 by yamini.v

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At room temperature , the rms speed of the molecules of a diatomic gas is found to be 1933 m/s . The gas is

asked Mar 31, 2014 by yamini.v

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A gas mixture consists of 2 mol of oxygen and 4 moles of Argon at temperature T . Neglecting all vibrational moles , the total internal energy of the system is

asked Mar 31, 2014 by yamini.v

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If 2 moles of diatomic gas and 1 mole of monoatomic gas are mixed , then ratio of specific heats $\;\large\frac{C_{p}}{C_{v}}\;$ is

asked Mar 27, 2014 by yamini.v

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A monoatomic gas expands at constant pressure on heating . The percentage of heat supplied used for external work is

asked Mar 27, 2014 by yamini.v

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A gas is heated at constant pressure . The fraction of heat supplied used for external work expressed in terms of the adiabatic index is

asked Mar 27, 2014 by yamini.v

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The number of particles in a cubic millimeter of a gas at temperature 273 K and 1.00 atm pressure is

asked Mar 27, 2014 by yamini.v

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A closed vessel contains 8 g of oxygen and 7 g of nitrogen . The total pressure is 10 atm at a given temperature . If now oxygen is absorbed by introducing a suitable absorbent , the pressure of the remaining gas is atm will be

asked Mar 27, 2014 by yamini.v

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Calculate the temperature if helium atoms have an rms speed equal to the escape velocity from the surface of the Earth (11.2km/s)?

asked Mar 27, 2014 by yamini.v

1 answer

If $L= 10\;mH,C=100\;\mu F,R=100 \;\Omega $ in a LCR circuit the value of resonance frequency is

asked Mar 27, 2014 by meena.p

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Power factor of resonance LCR circuit is

asked Mar 27, 2014 by meena.p

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In an ac circuit $E=E_0\;\sin wt$ and $I=I_0 \sin (wt -\large\frac{\pi}{2})$ the power consumption in circuit is

asked Mar 27, 2014 by meena.p

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Resonance frequency of a circuit is f. If capacitance is made 4 time the initial value, the resonance frequency will be

asked Mar 27, 2014 by meena.p

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Voltage and current in the a.c circuit are given by $V= 5 \sin (100 \pi t -\large\frac{\pi}{6})$ and $I= 4 \sin (100 \pi t + \pi/6)$

asked Mar 27, 2014 by meena.p

1 answer

In an LCR series circuit, connected to a source E is at resonance then

asked Mar 27, 2014 by meena.p

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Two coaxial solenoids are made by winding their insulated wire over a pipe of cross sectional area $A= 10\;cm^2$ length $20\;cm$ .One of the solenoids has 200 turns and another 400 turns. the mutual inductance is .

asked Mar 27, 2014 by meena.p

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Two induction coil of inductance $L_1$ and $L_2$ are separated by a considerable distance. On connectivity them in series the equivalent inductance is

asked Mar 27, 2014 by meena.p

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A current carrying square loop is placed near an infinitely long current carrying wire. The torque acting on the loop is

asked Mar 27, 2014 by meena.p

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A current caring wire AB is placed near another long current carrying wire CD. If free to move AB will have D.

asked Mar 27, 2014 by meena.p

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Three closed vessels A , B and C are at the same temperature T and contain gases which obey maxwellian distibution of velocities . Vessel A contains only $\;O_{2}\;$ . B only $\;N_{2}\;$ and C a mixture of equal quantities of $\;O_{2}\;$ and $\;N_{2}\;$ . If the average speed of $\;O_{2}\;$ molecules in vessel A is $\;V_{1}\;$ , that of $\;N_{2}\;$ molecules in vessel B is $\;V_{2}\;$ the average speed of the $\;O_{2}\;$ molecules in vessel C will be

asked Mar 27, 2014 by yamini.v

2 answers

Consider a mixture of oxygen and hydrogen kept at room temperature . As compared to a hydrogen molecule , an oxygen molecule hits the wall

asked Mar 27, 2014 by yamini.v

1 answer

A circular loop of radius R, carrying current I lies in $X-Y $ plane with its centre at origin. The total magnetic flux through $X-Y$ plane is

asked Mar 27, 2014 by meena.p

1 answer

The rms speed of oxygen molecules in a gas is V . If the temperature is doubled and the $\;O_{2}\;$ molecule dissociates into oxygen atoms , the rms speed will become

asked Mar 27, 2014 by yamini.v

1 answer

Suppose a container is evaluated to leave first one molecule of a gas in it . Let $\;V_{a}\;$ and $\;V_{rms}\;$ represents the average speed and the rms speed of the gas .

asked Mar 27, 2014 by yamini.v

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Figure shows graphs of pressure Vs density for an ideal gas at two temperatures $\;T_{1}\;$ and $\;T_{2}\;$

asked Mar 27, 2014 by yamini.v

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When a wire loop is rotated in a magnetic field, the direction of induced emf

asked Mar 26, 2014 by meena.p

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A magnet is dropped inside a long hollow vertical metal pipe. During the fall the acceleration of magnet.

asked Mar 26, 2014 by meena.p

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The current flowing in two coaxial coils is in the same direction. If we increase the distance between the two , the electric current will,

asked Mar 26, 2014 by meena.p

1 answer

An LCR circuit given below is connected to a variable frequency w and constant peak voltage $V_0$ . at certain $w_0=w_1$ the rms voltage value across L, C and R are respectively $100\;V,60\;V$ and $30\;V$ . At different value of $w_0=w_2$ we find the voltage across resistance is $50\;V$ Then $w_2$ is

asked Mar 26, 2014 by meena.p

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The $220\;v$ input is supplied to a transformer . The output circuit draws current of $2.0\;A$ at $440\;V$ If efficiency of transforms is $80\%$ te current drawn by primary circuit is

asked Mar 26, 2014 by meena.p

1 answer

The Voltage time (V-t) graph of triangular wave having peak value $V_0$ is shown. The rms value of V in interval $t=0$ to $t=\large\frac{\pi}{4}$ is

asked Mar 26, 2014 by meena.p

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A conducting ring of radius R is placed in a magnetic field perpendicular to the plane of the coil at the rate of $\beta$. Then Which one is correct ?

asked Mar 26, 2014 by meena.p

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A thin semicircular ring of radius 'a' is falling with its plane vertical to a horizontal magnetic field induction $\overrightarrow {B}$ .At the given position PQR the speed of ring is 'v' , the potential difference developed across the ring.

asked Mar 26, 2014 by meena.p

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Power loss in AC circuit will be minimum when

asked Mar 26, 2014 by meena.p

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The temperature at which the r.m.s. velocity of oxygen molecules equal that of nitrogen molecules at $\;100^{0}C\;$ is nearly :

asked Mar 26, 2014 by yamini.v

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Which of the following quantities is zero on an average for the molecules of an ideal gas in equilibrium ?

asked Mar 26, 2014 by yamini.v

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Which of the following is correct for the molecules of a gas in thermal equilibrium ?

asked Mar 26, 2014 by yamini.v

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If the temperature of a body is raised by $\;5 \%\;$ . Find increase in radiated energy .

asked Mar 26, 2014 by yamini.v

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Find the temperature at which a black body radiates energy at the rate of $\;5.67\;W/cm^{2}\;$

asked Mar 26, 2014 by yamini.v

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Two spheres of same material and radii 4 m and 1 m at temperature 1000 K and 2000 K . Find the ratio of the energies radiated by them in one second .

asked Mar 26, 2014 by yamini.v

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A fully charge capacitor of capacity $0.1\; \mu F$ is discharged through a resistor of resistance $10^6$ ohms. The time in which the potential falls to half its original value is $[\log_e2=0.6931]$

asked Mar 25, 2014 by meena.p

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A coil of inductance $L= 150\;mH$ and resistance $R= 70\;m \Omega$ is connected to a voltage source. How soon will the voltage attain $50\%$ of initial value

asked Mar 25, 2014 by meena.p

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A conducting rod of length $l=2\;cm$ moves with velocity 12 m/s at an angle $30^{\circ}$ to a magnetic field produced between two square faced poles of side 2 cm. If flux leaving the face is $5 \mu Wb$ the induces emf is

asked Mar 25, 2014 by meena.p

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A light string of mass m and length L has its ends tied to two walls that are separated by the distance D . Two objects each of mass M are suspended from the string as shown in figure given . if a wave pulse is sent from point A find speed is AB string

asked Mar 25, 2014 by balaji.thirumalai

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A 1200 turn coil of mean area $500 \;cm^2 $ is held perpendicular to a uniform field of $4 \times 10^{-4}$ tesla. The resistance of coil is $20 \Omega$ . What will be the average induced current when coil turns through $180^{\circ}$ in $0.1\;$second?

asked Mar 25, 2014 by meena.p

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Effective value of current is $5.0\;amp$ in a 50 cycle ac circuit. What is value of current $\large\frac{1}{300}\;$seconds after it is zero ?

asked Mar 25, 2014 by meena.p

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An LCR circuit has $L= 3.0 H, C= 27 \;\mu F$ and $ R= 7.4 \;\Omega$ with a certain a factor. To improve the sharpness of resonance by reducing its full width at half maximum by a factor of 2, with out changing $w_0$, we can

asked Mar 25, 2014 by meena.p

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The maximum emission wavelength at temperature 2000 K is $\;4 \mu m\;$ . The maximum wavelength corresponding to temperature 2400 K will be

asked Mar 25, 2014 by yamini.v

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Two identical rods A and B when joined in series conduct heat at a rate of 4 w at steady state . If they are connected in parallel , they conduct heat at rate of

asked Mar 25, 2014 by yamini.v

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