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Recent questions tagged ncert
Questions
A series LCR circuit with $L= 0.12 H,C= 480\;nF,R= 23 \Omega $ is connected to a $230\;v$ variable frequency supply .What is the source frequency for which average power absorbed by the circuit is maximum ? obtain the value of this mass power
cbse
class12
physics
ch7
sec-b
ncert
medium
asked
Sep 19, 2016
by
meena.p
1
answer
A series LCR circuit with $L= 0.12 H,C= 480\;nF,R= 23 \Omega $ is connected to a $230\;v$ variable frequency supply .
cbse
class12
physics
ch7
sec-a
ncert
medium
asked
Sep 19, 2016
by
meena.p
1
answer
Suppose a circuit containing 80 mH and a $60 \mu F$ capacitor in series is connected to a $230\;V, 50 \;Hz$ Supply . The resistance in the circuit is negligible . obtain the average power transferred to each element of the circuit , and the total power absorbed .
cbse
class12
physics
ch7
sec-a
ncert
medium
asked
Sep 19, 2016
by
meena.p
1
answer
A circuit containing a $80\;mH$ inductor and a $60 \mu F$ capacitor in series is connected to a $230\;v,50\;Hz$ supply . The resistance in the circuit is negligible. What is the total average power absorbed by the circuit ?
cbse
class12
physics
ch7
sec-a
ncert
easy
asked
Sep 19, 2016
by
meena.p
1
answer
A circuit containing a $80\;mH$ inductor and a $60 \mu F$ capacitor in series is connected to a $230\;v,50\;Hz$ supply . The resistance in the circuit is negligible. What is the average power transferred to capacitor ?
cbse
class12
physics
ch7
sec-a
ncert
easy
asked
Sep 16, 2016
by
meena.p
1
answer
A circuit containing a $80\;mH$ inductor and a $60 \mu F$ capacitor in series is connected to a $230\;v,50\;Hz$ supply . The resistance in the circuit is negligible. What is the average power transferred to inductor ?
cbse
class12
physics
ch7
sec-a
ncert
easy
asked
Sep 16, 2016
by
meena.p
1
answer
A circuit containing a $80\;mH$ inductor and a $60 \mu F$ capacitor in series is connected to a $230\;v,50\;Hz$ supply . The resistance in the circuit is negligible. obtain the current amplitude and V.M.S value of potential drop across each element .
cbse
class12
physics
ch7
sec-b
ncert
medium
asked
Sep 16, 2016
by
meena.p
1
answer
A circuit containing a $80\;mH$ inductor and a $60 \mu F$ capacitor in series is connected to a $230\;v,50\;Hz$ supply . The resistance in the circuit is negligible. obtain the current amplitude and V.M.S value
cbse
class12
physics
ch7
sec-b
ncert
medium
asked
Sep 15, 2016
by
meena.p
1
answer
Keeping the source frequency equal to the resonating frequency of the series LCR circuit , if the three elements L,C and R , an arranged in parallel , show that the total current in the parallel LCR circuit, is a minimum at this frequency . obtain the r.m.s value of current in each branch of the circuit for the elements and source whose values are $L= 5.0 \;H,C= 80\;\mu F, R= 40 \Omega$ for this frequency
cbse
class12
physics
ch7
sec-b
ncert
medium
asked
Sep 15, 2016
by
meena.p
1
answer
A $100 \mu F$ capacitor in series with a $40 \Omega$ resistance is connected to a $110\;v,12\;kHz$ supply's Is the statement that a capacitor is a conductor at very high frequencies . True or false ?
cbse
class12
physics
ch7
sec-c
ncert
difficult
asked
Sep 15, 2016
by
meena.p
1
answer
A $100 \mu F$ capacitor in series with a $40 \Omega$ resistance is connected to a $110\;V,60Hz$ supply , What is the time lag between maximum and voltage maximum ?
cbse
class12
physics
ch7
sec-b
ncert
medium
asked
Sep 15, 2016
by
meena.p
1
answer
A $100 \mu F$ capacitor in series with a $40 \Omega$ resistance is connected to a $110\;V,60Hz$ supply , What is the maximum current in the circuit ?
cbse
class12
physics
ch7
sec-b
ncert
medium
asked
Sep 15, 2016
by
meena.p
1
answer
How does an inductor behave in a d.c circuit after the steady state ?
cbse
class12
physics
ch7
sec-a
ncert
easy
asked
Sep 15, 2016
by
meena.p
1
answer
A coil of inductance $0.50\;H$ and resistance $100 \Omega$ is connected to a $240\;v,50\;Hz$ a.c supply. If the circuit is connected to a high frequency supply (240 v, 10 kHz) then at very frequency , inductor is that circuit nearly amounts to open circuit. Is this statement true or false ?
cbse
class12
physics
ch7
sec-c
ncert
difficult
asked
Sep 15, 2016
by
meena.p
1
answer
A coil of inductance $0.50\;H$ and resistance $100 \Omega$ is connected to a $240\;v,50\;Hz$ a.c supply What is the time lag between the voltage maximum and current maximum?
cbse
class12
physics
ch7
sec-a
ncert
medium
asked
Sep 14, 2016
by
meena.p
1
answer
A coil of inductance $0.50\;H$ and resistance is connected to a $240\;v,50\;Hz$ a.c supply What is the maximum current in the coil ?
cbse
class12
physics
ch7
sec-a
ncert
medium
asked
Sep 14, 2016
by
meena.p
1
answer
An LC circuit a $20\;mH$ inductor and a $50 \mu F$ capacitor with an initial charge of $10\;mc$ The resistance of the circuit is negligible. if a resistor is inserted in the circuit , how many energy is eventually dissipated as heat ?
cbse
class12
physics
ch7
sec-a
ncert
medium
asked
Sep 14, 2016
by
meena.p
1
answer
An LC circuit a $20\;mH$ inductor and a $50 \mu F$ capacitor with an initial charge of $10\;mc$ The resistance of the circuit is negligible. Let the instant the circuit is closed be $t=0$, At what time is the total energy should equally between the inductor and the capacitor?
cbse
class12
physics
ch7
sec-b
ncert
medium
asked
Sep 14, 2016
by
meena.p
1
answer
An LC circuit a $20\;mH$ inductor and a $50 \mu F$ capacitor with an initial charge of $10\;mc$ The resistance of the circuit is negligible. Let the instant the circuit is closed be $t=0$, At what time is the energy stored ? (i) Completely electrical? (ii) Completely magnetic ?
cbse
class12
physics
ch7
sec-c
ncert
medium
asked
Sep 12, 2016
by
meena.p
1
answer
An LC circuit a $20\;mH$ inductor and a $50 \mu F$ capacitor with an initial charge of $10\;mc$ The resistance of the circuit is negligible. Let the instant the circuit is closed be $t=0$, What is the natural frequency of the circuit ?
cbse
class12
physics
ch7
sec-c
ncert
medium
asked
Sep 12, 2016
by
meena.p
1
answer
An LC circuit a $20\;mH$ inductor and a $50 \mu F$ capacitor with an initial charge of $10\;mc$ The resistance of the circuit is negligible. Let the instant the circuit is closed be $t=0$, What is the total energy stored initially ? Is it conserved during the oscillations ?
cbse
class12
physics
ch7
sec-c
ncert
medium
asked
Sep 12, 2016
by
meena.p
1
answer
A series LCR circuit connected to a variable frequency $230\;v$ Source has $L= 5.0\;H,c=80 \mu F,R= 40 \Omega$ as shown in the figure. Determine the r.m.s potential drops across the three elements of the circuit . What is the potential drop across the LC combination at the resonating frequency .
cbse
class12
physics
ch7
sec-c
ncert
medium
asked
Sep 12, 2016
by
meena.p
1
answer
A series LCR circuit connected to a variable frequency $230\;v$ Source has $L= 5.0\;H,c=80 \mu F,R= 40 \Omega$ as shown in the figure. obtain the impedance of the circuit and amplitude of current at the resonating frequency.
cbse
class12
physics
ch7
sec-c
ncert
easy
asked
Sep 12, 2016
by
meena.p
1
answer
A series LCR circuit connected to a variable frequency $230\;v$ Source has $L= 5.0\;H,c=80 \mu F,R= 40 \Omega$ as shown in the figure
cbse
class12
physics
ch7
sec-c
ncert
easy
asked
Sep 12, 2016
by
meena.p
1
answer
A radio can tune over the frequency range of a portion of MW broadcast band (800 kHz to 1200 kHz) If its LC circuit has an effective inductance of $200\;\mu H$, What must be the range of its variable capacitor ?
cbse
class12
physics
ch7
sec-c
ncert
medium
asked
Sep 9, 2016
by
meena.p
1
answer
A series LCR circuit with $R= 20\; \Omega, L= 1.5\;H$ and $C= 35\;\mu F$ is connected to a variable frequency 200 v a.c supply. when the frequency of the supply equals the natural frequency of the circuit, what is the average power transferred to the circuit in one complete cycle ?
cbse
class12
physics
ch7
sec-a
ncert
easy
asked
Sep 9, 2016
by
meena.p
1
answer
A changed $30 \;\mu F$ capacitor is connected to a $27\;mH$ inductor. Suppose the initial charge on the capacitor is $6\;mc$ what is the total energy stored in the capacitor initially ? What is the total energy at later time ?
cbse
class12
physics
ch7
sec-a
ncert
easy
asked
Sep 9, 2016
by
meena.p
1
answer
Which of the following frequency will be suitable for beyond the horizon communication using sky waves.
cbse
class12
physics
ch15
sec-a
ncert
easy
asked
Sep 9, 2016
by
meena.p
1
answer
A changed $30 \mu F$ capacitor is connected to a $27 mH$ inductor . What is the angular frequency of free oscillation of the circuit ?
cbse
class12
physics
ch7
sec-a
ncert
easy
asked
Aug 23, 2016
by
meena.p
1
answer
obtain the resonant frequency $(w_r)$ of a series LCR circuit with $L=2.0 \;H,c=32\;\mu F$ and $R= 100 hm$ What is the Q value of this circuit ?
cbse
class12
physics
ch7
sec-a
ncert
easy
asked
Aug 23, 2016
by
meena.p
1
answer
A $60 \mu F$ capacitor is connected to a $110\;v,60\;Hz$ a.c supply what is the net power absorbed by reach circuit over a completed cycle ? explain your answer
cbse
class12
physics
ch7
sec-a
ncert
easy
asked
Aug 23, 2016
by
meena.p
1
answer
A $44\;mH$ inductor is connected to $220\;v, 50Hz$a.c supply . What is the net power absorbed by each circuit over a complete cyde ? Explain your answer
cbse
class12
physics
ch7
sec-a
ncert
easy
asked
Aug 23, 2016
by
meena.p
1
answer
A $44\;mH$ inductor is connected to $220\;v,50\;Hz$ a.c supply . Determine the r.m.s value of current in the circuit .
cbse
class12
physics
ch7
sec-a
ncert
easy
asked
Aug 23, 2016
by
meena.p
1
answer
The rms value of current in the ac circuit is $10\;A$ What is the peak current ?
cbse
class12
physics
ch7
sec-a
ncert
easy
asked
Aug 23, 2016
by
meena.p
1
answer
The peak voltage at an ac supply is $300 \;v$ What is the rms voltage ?
cbse
class12
physics
ch7
sec-a
ncert
easy
asked
Aug 23, 2016
by
meena.p
1
answer
A $100 \Omega$ resistor is connected to a $220\;v,50\;Hz$ ac supply. What is the net power consumed over a full cycle ?
cbse
class12
physics
ch7
sec-a
ncert
easy
asked
Aug 23, 2016
by
meena.p
1
answer
A $100 \Omega$ resistor is connected to a $220 \;v, 50 Hz$ ac supply . What is the rms values of current in the circuit ?
cbse
class12
physics
ch7
sec-a
ncert
easy
asked
Aug 23, 2016
by
meena.p
1
answer
Some scientists have predicted that a global nuclear war on the earth would be followed by a severe nuclear winter with a devastating effect on life on earth. What might be the basis of their prediction ?
cbse
class12
physics
ch8
sec-a
ncert
easy
asked
Aug 18, 2016
by
meena.p
1
answer
If the earth did not have atmosphere would its average temperature be higher or lower than it is now ?
cbse
class12
physics
ch8
sec-a
ncert
easy
asked
Aug 18, 2016
by
meena.p
1
answer
The small ozone layer on the top of the atmosphere is for human survival on why ?
cbse
class12
physics
ch8
sec-a
ncert
easy
asked
Aug 18, 2016
by
meena.p
1
answer
Optical and radio telescopes are built on the ground but x- ray astronomy is possible only from satellite orbiting the earth . why ?
cbse
class12
physics
ch8
sec-a
ncert
easy
asked
Aug 18, 2016
by
meena.p
1
answer
It is necessary to use satellites for long distance T.V transmission . Why ?
cbse
class12
physics
ch8
sec-a
ncert
easy
asked
Aug 18, 2016
by
meena.p
1
answer
Long distance ratio broad casts use short wave bands why ?
cbse
class12
physics
ch8
sec-a
ncert
easy
asked
Aug 18, 2016
by
meena.p
1
answer
State the parts of e.m spectrum to which $14.4\;kev$ (energy of a particular transition $Cn Fe^{57} $ nucleus associated with a famous high resolution spectroscopic method Massbauer spectroscopy ]
cbse
class12
physics
ch8
sec-a
ncert
easy
asked
Aug 18, 2016
by
meena.p
1
answer
State the parts of e.m spectrum to which $5890^{\circ} A - 5896 ^{\circ} A$ (double lines of sodium).
cbse
class12
physics
ch8
sec-a
ncert
easy
asked
Aug 18, 2016
by
meena.p
1
answer
State the parts of e.m spectrum to which $2.7 \;k$ (temperature with isotropic radiation filly all space - through to be a relic of the big bang origin of the universe ).
cbse
class12
physics
ch8
sec-a
ncert
easy
asked
Aug 18, 2016
by
meena.p
1
answer
State the part of the spectrum to which $1057\;MHz$ [frequency of radiation arising from two close energy levels in hydrogen known as lamb shift .
cbse
class12
physics
ch8
sec-a
ncert
easy
asked
Aug 18, 2016
by
meena.p
1
answer
State the part of the spectrum to which $21\;cm$ (wave length emitted by atomic hydrogen in interstellar space)
cbse
class12
physics
ch8
sec-a
ncert
easy
asked
Aug 18, 2016
by
meena.p
1
answer
About $5\%$ of the power of a low light bulb is converted to visible radiation . What is the average intensity of visible radiation , at a distance of $10\;m$. Assume that the radiation is emitted isotropic-ally and neglect reflection .
cbse
class12
physics
ch8
sec-a
ncert
easy
asked
Aug 18, 2016
by
meena.p
1
answer
About $5\%$ of the power of a low light bulb is converted to visible radiation . What is the average intensity of visible radiation , at a distance of 1m from the bulb ?
cbse
class12
physics
ch8
sec-a
ncert
easy
asked
Aug 18, 2016
by
meena.p
1
answer
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