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Recent questions tagged physics
Questions
Interference pattern is absorbed at ' P ' due to superimposition of two rays coming out from a source ' S ' as shown in the figure . The value of ' l ' for which maxima is obtained at ' P ' is : (R is perfect reflecting surface)
jeemain
physics
2014
set-06
asked
May 24, 2014
by
yamini.v
0
answers
A lamp emits monochromatic green light uniformly in all directions . The lamp is $\;3 \%\;$ efficient in converting electrical power to electromangetic waves and consumes 100 W of power .The amplitude of the electric filed associated with the electromagnetic radiation at a distance of 5 m from the lamp will be nearly :
jeemain
physics
2014
set-06
asked
May 24, 2014
by
yamini.v
0
answers
A sinusoidal voltage $\;V(t)=100\;sin (500 t)\;$ is applied across a pure inductance of $\;L=0.02 \;H\;$ . The current through the coil is :
jeemain
physics
2014
set-06
asked
May 24, 2014
by
yamini.v
0
answers
Consider two thin identical conducting wires covered with very thin insulating material . One of the wires is bent into a loop and produces magnetic field $\;B_{1}\;$ , at its center when a current I passes through it .The second wire is bent into a coil with three identical loops adjacent to each other and produces magnetic field $\;B_{2}\;$ at the center of the loops when current $\;\large\frac{I}{3}\;$ passes through it . The ratio $\;B_{1} : B_{2}\;$ is :
jeemain
physics
2014
set-06
asked
May 24, 2014
by
yamini.v
0
answers
A positive charge ' q ' of mass ' m ' is moving along the $\;+ x\;$ axis .We wish to apply a uniform magnetic field B for time $\;\Delta t\;$ so that the charge reverses its direction crossing the y- axis at a distance d . Then :
jeemain
physics
2014
set-06
asked
May 24, 2014
by
yamini.v
0
answers
The circuit as shown here has two batteries of 8.0 V and 16.0 V and three resistors $\;3 \Omega,9 \Omega\;$ and $\;9 \Omega\;$ and a capacitor $\;5.0\;\mu F\;$ . How much is the current I in the circuit in steady state ?
jeemain
physics
2014
set-06
asked
May 24, 2014
by
yamini.v
0
answers
The space between the plates of a parallel plate capacitor is filled with a ' dielectric ' whose dielectric constant varies with distance as for the relation : $\;K(x)=K_{0}+\lambda x\;$ ($\lambda\;$)=a constant . The capacitance C , of this capacitor , would be related to its ' vacuum ' capacitance $\;C_{0}\;$ as for the relation :
jeemain
physics
2014
set-06
asked
May 24, 2014
by
yamini.v
1
answer
A spherically symmetric charge distribution is characterised by a charge density having the following variation : \[\]$\;\rho(r)=\rho_{0}(1-\large\frac{r}{R})\;for\;r < \normalsize R\;$\[\]$\;\rho(r) =0 \;\; r \geq R\;$ \[\] where r is the distance from the center of the charge distribution and $\;\rho_{0}\;$ is a constant .The electric field at an internal point $(r < R)$ is :
jeemain
physics
2014
set-06
asked
May 23, 2014
by
yamini.v
1
answer
A source of sound A emitting waves of frequency 1800 Hz is falling towards ground with a terminal speed v .The observer B on the ground directly beneath the source receives waves of frequency 2150 Hz .The source A receives waves , reflected from ground , of frequency nearly : (Speed of sound =343 m/s)
jeemain
physics
2014
set-06
asked
May 23, 2014
by
yamini.v
0
answers
Which of the following expressions corresponds to simple harmonic motion along a straight line , where x is the displacement and a,b,c are positive constants ?
jeemain
physics
2014
set-06
asked
May 23, 2014
by
yamini.v
1
answer
At room temperature a diatomic gas is found to have an r.m.s. speed of $\;1930\;ms^{-1}\;$ .The gas is :
jeemain
physics
2014
set-06
asked
May 23, 2014
by
yamini.v
1
answer
A car not engine absorbs 1000 J of heat energy from a reservoir at $\;127^{0}C\;$ and rejects 600 J of heat energy during each cycle .The efficiency of engine and temperature of sink will be :
jeemain
physics
2014
set-06
asked
May 23, 2014
by
yamini.v
0
answers
Hot water cools from $\;60^{0}\;$ to $\;50^{0}\;$ in the first 10 minutes and to $\;42^{0}\;$ in the next 10 minutes .The temperature of the surroundings is :
jeemain
physics
2014
set-06
asked
May 23, 2014
by
yamini.v
0
answers
Two soap bubbles coalesce to form a single bubble . If V is the subsequent change in volume of contained air and S the change in total surface area , T is the surface tension and P atmospheric pressure ,which of the following relation is correct ?
jeemain
physics
2014
set-06
asked
May 23, 2014
by
yamini.v
1
answer
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