Test Details

Important

BOARD based

Nov 19, 8:15 AM

45 minutes

Nov 19, 9:05 AM

40.0 marks

MCQ

20 questions

ajay verma

ajay veram MSc physics 20 year experience of teaching . I served as physics faculty in different institutes like dronacharya academy New Delhi mentor Patna, Vidya classes Patna

Class Details

Physics

12th

Physics

12th cbse and bihar board At ONE STEP PHYSICS, we are focused on providing better education services with the highest levels of students satisfaction – we will do everything we can to meet your goal. We’re sure you’ll be happy learning with us. Look around our website and if you have any comments or questions, please feel free to contact us. We hope to see

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Question Text

Question 1 :
Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication?

Question 2 :
In an LCR circuit inductance is changed from $L$ to $\dfrac{L}{2}$. To keep the same resonance frequency, $C$ should be changed to

Question 3 :
A current $i_0$ is flowing through an $L-R$circuit of time constant $t_0$. The source of the current is switched off at time $t = 0$. Let $r$be the value of $(-di/dt)$at time $t=0$. Assuming this rate to be constant, the current will reduce to zero in a time interval of:

Question 4 :
Assertion: In a series RLC circuit, if $V_R, V_L $ and $V_C$ denote ems voltage across $R, L$ and $C$, respectively, and $V_s$ is the rms voltage across the source, then $V_S = V_R + V_L + V_C$. Reason: In ac circuits, Kitchoff's voltage law is correct at every instant of time.

Question 5 :
In a certain loaded transformer, the secondary voltage is one-fourth the primary voltage. The secondary current is

Question 6 :
In an LCR circuit $ R=100 \Omega $ when capacitance C is removed, the current lags behind the voltage by $ \pi / 3 $. when inductance L is removed, the current leads the voltage by $ \pi / 3 $. the imoedance of the circuit is

Question 7 :
Thevalues of $L, C$ and $R$ in an $L-C-R$ series circuit are $4 mH,40 pF$ and $100 \Omega$ respectively. The quality factorofthe current is

Question 8 :
For the given transformer, the ratio of number of turns in primary and secondary coils is $1:7$. If the input voltage and current are $50$ V and $5$ A respectively then the value of output current is ____A.

Question 9 :
The ratio of no. of coils in the secondary to primary  step up transformer is $4:1$. If a current of $4\ $ $A$ is applied to the primary, the current in secondary will be:

Question 10 :
In a black box of unknown elements $(L$ or $R$ or any other combination$)$, an ac voltage $E = E_0\sin(\omega t + \phi)$ is applied and current in the circuit was found to be $I = I_0\sin[\omega t + \phi + (\pi/4)]$. Then the unknown elements in the box may be

Question 11 :
A resonant A.C. circuit contains a capacitor of capacitance ${ 10 }^{ -6 }$ F and an inductor of ${ 10 }^{ -4 }$ H. The frequency of oscillations will be :

Question 12 :
If $25 W$ of power are applied to the primary of an ideal transformer with a turns ratio of $10$, the power delivered to the secondary load is

Question 13 :
In a step-up transformer, if ratio of truns of primary to secondary is $1 : 10$ and primary voltage is $230\ V$. If the load current is $2\ A$, then the current in primary is

Question 14 :
What is the value of inductance $L$ for which the current flowing is maximum in a series LCR circuit with $C = 10 \mu F$ and $\omega = 1000 {s}^{-1}$ ?

Question 15 :
The time taken by the current to rise to $0.63$ of its maximum value in a d.C circuit containing inductance $(L)$ and resistance $(R)$ depends on

Question 16 :
The power loss in an AC circuit can be minimized by.

Question 17 :
Which of the following components of a LCR circuit, with ac supply ,dissipates energy

Question 18 :
In an A.C. circuit, containing an inductance and a capacitor in series, the current is found to be maximum when the value of the inductance is 0.5 Henry and capacitance is 8$\mu $F . The angular frequency of the input A.C. voltage must be equal to

Question 19 :
For an ideal step-down transformer, the quantity which is constant for both the coils will be

Question 20 :
An inductance $L$, a capacitance $C$ and a resistance $R$ may be connected to an AC source of angular frequency $\omega$ , in three different combinations of RC, RL and LC in series. Assume that $\omega L=\dfrac{1}{\omega C} $ . The power drawn by the three combinations are $P_{1},P_{2},P_{3}$ respectively. Then,

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