Test Details

Revision Test-1

Do all questions

Nov 08, 6:00 PM

60 minutes

Nov 08, 7:00 PM

30.0 marks

MCQ

30 questions

Prateek Singh

Simplified Teacher

Class Details

Physics

Class -12

Physics

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Question Text

Question 1 :
The square root ofthe product ofinductance and capacitance has dimensions of

Question 2 :
For L-C-R, A.C circuit resonance frequency is $600Hz$ and frequencies at half power points are $550Hz$ and $650Hz$. What will be the Q-factor?

Question 3 :
If $V=100 \sin 100t$ volt, and $I=100 \sin(100t+\dfrac {\pi}{6})A$. then find the watt less power in watt?

Question 4 :
Whenthe values of inductance and capacitance in an $L-C$ circuit are $0.5\ H$ and $8\ \mu$F respectively then currentinthe circuit is maximum. The angular frequency ofalternatinge.m.f. applied in the circuit will be

Question 5 :
What do we name the  device which increases the emf ?

Question 6 :
An ideal transformer has 500 and 5000 turns inprimary and secondary winding respectively. If theprimary coil is connected to a 6 V battery then thesecondary voltage is :

Question 7 :
The number of turns in primary and secondary coils of a transformer is 50 and 200 respectively. If the current in the primary coil is 4A, then the current in the secondary coil is :

Question 9 :
In an ac circuit with voltage V and current I, the power dissipated is

Question 11 :
If a stepup transformer develops 400V in secondary coil for an input of 200V A.C, then the current in the transformer is :

Question 12 :
The correct formula for the angular frequency $\omega_0$ of an $L-C$ resonant circuit is

Question 13 :
In a circuit $LC = 10^{-3}H, C = 10^{-3} F$. Find angular frequency.

Question 15 :
A certain series resonant circuit has a bandwidth of $2 kHz$. If the existing coil is replaced with one having a higher value of $Q$, the bandwidth will

Question 16 :
A transformer steps up an $AC$supply from$220 V$to$2200V$. If the secondary coil of the transformer has$2000$turns, the number of turns in its primary coil will be:

Question 17 :
Assertion: A step up transformer can also be used as a step down transformer. Reason: This is because $\cfrac { { E }_{ p } }{ { E }_{ s } } =\cfrac { { n }_{ s } }{ { n }_{ p } } $

Question 19 :
An inductance, a capacitance and a resistance are connected in series across a source of alternating voltages. At resonance, the applied voltage and the current flowing through the circuit will have a phase difference of

Question 20 :
The ratio of the secondary to the primary turns in a transformer is $3:2$ and the output power is $P$. Neglecting all power losses, the input power must be:

Question 22 :
Thesharpness of resonance in a series $L-C-R$ resonantcircuit,as the resistance of the circuit is increased,goeson

Question 24 :
The self inductance of the motor of an electric fan is 10 H. In order to impart maximum powr of 50 Hz, it should be connected to a capacitance of

Question 26 :
In an ideal parallel LC circuit, the capacitor is charged by connecting it to a DC source which is then disconnected. The current in the circuit

Question 27 :
In a step-down transformer the secondary coil has .............. number of turns.

Question 28 :
A device that increases the voltage of an alternating current is called a(n)

Question 30 :
A step-down transformer reduces the voltage of a transmission line from $2200\ V$ to $220\ V$. The power delivered by it is $880\ W$ and its efficiency is $88$%. The input current is :

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