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Recent questions tagged physics
Questions
Calculate the temperature if helium atoms have an rms speed equal to the escape velocity from the surface of the Earth (11.2km/s)?
jeemain
physics
kinetic-theory-of-gases
class11
ch13
kinetic-theory-of-an-ideal-gas
speed-of-molecules
easy
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
jeemain
physics
class12
ch7
alternating-current
ac-voltage-applied-to-lcr-circuit
easy
asked
Mar 27, 2014
by
meena.p
1
answer
Power factor of resonance LCR circuit is
jeemain
physics
class12
ch7
alternating-current
ac-voltage-applied-to-lcr-circuit
easy
asked
Mar 27, 2014
by
meena.p
1
answer
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
jeemain
physics
class12
ch6
alternating-current
power-in-ac-circuit
easy
asked
Mar 27, 2014
by
meena.p
1
answer
Resonance frequency of a circuit is f. If capacitance is made 4 time the initial value, the resonance frequency will be
jeemain
physics
class12
ch7alternating-current
ac-voltage-applied-to-lcr-circuit
easy
asked
Mar 27, 2014
by
meena.p
1
answer
Voltage and current in the a.c circuit are given by $V= 5 \sin (100 \pi t -\large\frac{\pi}{6})$ and $I= 4 \sin (100 \pi t + \pi/6)$
jeemain
physics
class12
ch7
alternating-current
ac-current-and-voltage
-by-rotating-vectors
easy
asked
Mar 27, 2014
by
meena.p
1
answer
In an LCR series circuit, connected to a source E is at resonance then
jeemain
physics
class12
ch7
alternating-current
ac-voltage-applied-to-lcr-circuit
easy
asked
Mar 27, 2014
by
meena.p
1
answer
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 .
jeemain
physics
class12
ch6
electromagnetic-induction
inductance
easy
asked
Mar 27, 2014
by
meena.p
1
answer
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
jeemain
physics
class12
ch6
electromagnetic-induction
inductance
easy
asked
Mar 27, 2014
by
meena.p
1
answer
A current carrying square loop is placed near an infinitely long current carrying wire. The torque acting on the loop is
jeemain
physics
class12-ch4
moving-charges-and-magnetism
force-between-two-parallel-currents
medium
asked
Mar 27, 2014
by
meena.p
1
answer
A current caring wire AB is placed near another long current carrying wire CD. If free to move AB will have D.
jeemain
physics
class12
ch4
moving-charge-and-magnetism
biot-savart-law
easy
asked
Mar 27, 2014
by
meena.p
1
answer
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
jeemain
physics
class11
speed-of-molecules
kinetic-theory-of-gases
easy
kinetic-theory-of-an-ideal-gas
ch13
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
jeemain
physics
class11
speed-of-molecules
kinetic-theory-of-gases
easy
kinetic-theory-of-an-ideal-gas
ch13
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
jeemain
physics
class12
ch6
electromagnetic-induction
magnetic-flux
easy
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
jeemain
physics
class11
ch13
kinetic-theory-of-gases
easy
kinetic-theory-of-an-ideal-gas
speed-of-molecules
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 .
jeemain
physics
class11
cbse
kinetic-theory-of-gases
easy
asked
Mar 27, 2014
by
yamini.v
1
answer
Figure shows graphs of pressure Vs density for an ideal gas at two temperatures $\;T_{1}\;$ and $\;T_{2}\;$
jeemain
physics
class11
cbse
kinetic-theory-of-gases
easy
asked
Mar 27, 2014
by
yamini.v
1
answer
When a wire loop is rotated in a magnetic field, the direction of induced emf
jeemain
physics
class12
ch6
electromagnetic-induction
motional-electromotive-force
easy
asked
Mar 26, 2014
by
meena.p
1
answer
A magnet is dropped inside a long hollow vertical metal pipe. During the fall the acceleration of magnet.
jeemain
physics
electromagnetic-induction-and-alternating-current
easy
asked
Mar 26, 2014
by
meena.p
1
answer
The current flowing in two coaxial coils is in the same direction. If we increase the distance between the two , the electric current will,
jeemain
physics
class12
ch6
electromagnetic-induction
lenzs-law
easy
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
jeemain
physics
class12
ch7
alternating-current
ac-voltage-applied-to-lcr-circuit
difficult
asked
Mar 26, 2014
by
meena.p
1
answer
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
jeemain
physics
class12
ch7alternating-current
transformers
medium
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
jeemain
physics
class12
ch7alternating-current
ac-current-and-voltage-by-rotating-vectors
rm-value
medium
asked
Mar 26, 2014
by
meena.p
1
answer
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 ?
jeemain
physics
class12
ch6
electromagnetic-induction
faradays-law
difficult
asked
Mar 26, 2014
by
meena.p
1
answer
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.
jeemain
physics
class12
ch6
electromagnetic-induction
motional-electromotive-force
difficult
asked
Mar 26, 2014
by
meena.p
1
answer
Power loss in AC circuit will be minimum when
jeemain
physics
class12
ch7
alternating-current
power-in-ac-circuit
easy
asked
Mar 26, 2014
by
meena.p
1
answer
The temperature at which the r.m.s. velocity of oxygen molecules equal that of nitrogen molecules at $\;100^{0}C\;$ is nearly :
jeemain
physics
class11
cbse
kinetic-theory-of-gases
easy
asked
Mar 26, 2014
by
yamini.v
1
answer
Which of the following quantities is zero on an average for the molecules of an ideal gas in equilibrium ?
molecular-nature-of-matter
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
kinetic-theory-of-an-ideal-gas
speed-of-molecules
easy
asked
Mar 26, 2014
by
yamini.v
1
answer
Which of the following is correct for the molecules of a gas in thermal equilibrium ?
jeemain
physics
kinetic-theory-of-gases
class11
ch13
kinetic-theory-of-an-ideal-gas
speed-of-molecules
asked
Mar 26, 2014
by
yamini.v
1
answer
If the temperature of a body is raised by $\;5 \%\;$ . Find increase in radiated energy .
jeemain
physics
class11
cbse
thermodynamics
heat-transfer
easy
asked
Mar 26, 2014
by
yamini.v
1
answer
Find the temperature at which a black body radiates energy at the rate of $\;5.67\;W/cm^{2}\;$
jeemain
physics
class11
cbse
thermodynamics
heat-transfer
easy
asked
Mar 26, 2014
by
yamini.v
1
answer
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 .
jeemain
physics
class11
cbse
thermodynamics
heat-transfer
easy
asked
Mar 26, 2014
by
yamini.v
1
answer
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 $[\log_e2=0.6931]$
jeemain
physics
electrostatic-potential-and-capacitance
charging-and-discharging-of-capacitors
medium
asked
Mar 25, 2014
by
meena.p
1
answer
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
jeemain
physics
class12
ch6
electromagnetic-induction
inductance
medium
asked
Mar 25, 2014
by
meena.p
1
answer
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
jeemain
physics
class12
ch6
electromagnetic-induction
motional-electromotive-force
medium
asked
Mar 25, 2014
by
meena.p
1
answer
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
cl31072
jeemain
physics
class12
unit10
oscillations-and-waves
difficult
asked
Mar 25, 2014
by
balaji.thirumalai
1
answer
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?
jeemain
physics
class12
ch6
electromagnetic-induction
faradays-law
medium
asked
Mar 25, 2014
by
meena.p
1
answer
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 ?
jeemain
physics
class12
ch7
alternating-current
rms-value-of-ac-current
medium
asked
Mar 25, 2014
by
meena.p
1
answer
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
jeemain
physics
class12
ch7
alternating-current
ac-voltage-applied-to-lcr-circuit
medium
asked
Mar 25, 2014
by
meena.p
1
answer
The maximum emission wavelength at temperature 2000 K is $\;4 \mu m\;$ . The maximum wavelength corresponding to temperature 2400 K will be
jeemain
physics
class11
cbse
thermodynamics
heat-transfer
easy
asked
Mar 25, 2014
by
yamini.v
1
answer
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
jeemain
physics
class11
cbse
thermodynamics
heat-transfer
easy
asked
Mar 25, 2014
by
yamini.v
1
answer
In an ac circuit with combination of L and C which one of following represents the variation of frequency f with reactance X?
jeemain
physics
class12
ch6
alternating-current
ac-voltage-applied-to-capacitor-inductors
medium
asked
Mar 25, 2014
by
meena.p
1
answer
The ends of a metal rod of length 60 cm are showing the steady temperature $\;70^{0}C\;$ and $\;30^{0}C\;$ is the steady state . The temperature of the rod at a distance of 15 cm from hot end is
jeemain
physics
class11
cbse
thermodynamics
heat-transfer
easy
asked
Mar 25, 2014
by
yamini.v
1
answer
The equation of AC voltage is $E=220\; \sin (wt+\large\frac{\pi}{6})$ and AC current is $I= 10 \sin (wt+\large\frac{\pi}{6})$ The average power dissipated is
jeemain
physics
class12
ch7
alternating-current
power-in-ac-circuit
medium
asked
Mar 25, 2014
by
meena.p
1
answer
A bulb is rated $100\;V,100\;W$ The inductance of an inductor that should be connected in series with the bulb to operate the bulb at rated power, with ac source $200 V, 50 \;Hz$
jeemain
physics
class12
ch7
alternating-current
power-in-ac-circuit
medium
asked
Mar 25, 2014
by
meena.p
1
answer
Five rods of the same dimension are arranged as shown . AB are maintained at different temperatures . No Heat flows through the central rod ; then
jeemain
physics
class11
cbse
thermodynamics
heat-transfer
easy
asked
Mar 25, 2014
by
yamini.v
1
answer
Two metal rods have their thermal conductivities $\;K_{1}\;$ and $\;K_{2}\;$ in the ratio 3 : 2 so that their thermal resistance are the same . Then their lengths are is the ratio ( Area of C .S . are the same )
jeemain
physics
class11
cbse
thermodynamics
heat-transfer
easy
asked
Mar 25, 2014
by
yamini.v
1
answer
A square iron plate of side 3 cm and thickness 8 mm has its opposite faces at $\;100^{0}C\;$ and $\;60^{0}C\;$ . If K=0.16 C.G.S units , then the amount of heat flow through the rod is 1 minute is
jeemain
physics
class11
cbse
thermodynamics
heat-transfer
easy
asked
Mar 25, 2014
by
yamini.v
1
answer
An AC Source gives a voltage of $V= 20\; \cos \;(2000 \;t)$. It is connected in a circuit as shown. The voltmeter reading is
jeemain
physics
class12
ch7alternating-current
ac-voltage-applied-to-lcr-circuit
difficult
asked
Mar 25, 2014
by
meena.p
1
answer
For the series LCR circuit what is resonance frequency and amplitude.
jeemain
physics
alternating-current
ac-voltage-applied-to-lcr-circuit
class12
ch7medium
asked
Mar 25, 2014
by
meena.p
1
answer
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