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Alternating Current Physics - Alternating Current

Rajasthan Board (RBSE) - STD 12 Science - Physics (Rajasthan - English Medium). 122 questions in this chapter.

Question types

Alternating Current question types

122 questions across 7 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

122
Questions
7
Question groups
5
Question types
Sample Questions

Alternating Current questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark
Peak value of applied alternating voltage in a LR cir- cuit is 5 V. If magnitude of maximum voltage across the ends of resistor is 3 V. then maximum value of voltage across the inductor is
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Q 5M.C.Q (1 Marks)1 Mark
The number of turns in primary and secondary coils of a transformer are 100 and 300 respectively. If in- put power is 60 W, then output power will be:
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Q 61 Marks Question1 Mark
The instantaneous magnitudes of current and voltage in an ac circuit are given as $I =10 \sin 314 t A$ and $V =50 \sin \left(314 t +\frac{\pi}{2}\right) \quad V$ respectively. What is the dissipation of average power in the circuit?
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Q 91 Marks Question1 Mark
In an ac circuit, instantaneous current and voltage are $I = I _0 \sin 300 t A$ and $V =200 \sin 300 t$ respectively. What is average power dissipated in the circuit?
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Q 112 Marks Questions2 Marks
Sunita and her friends went to an exhibition. The guard standing there asked them to pass through a metal detector. Sunita's friends were first afraid but when Sunita told them the reason and explain its working.
Answer the following questions :
(a) State the principle on which metal detector works.
(b) If a person passing through metal detector has some metallic object then why does it produces sound?
(c) Tell two qualities of Sunita which she showed while explaining the reason for passing through it.
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Q 142 Marks Questions2 Marks
A series LCR circuit with R = 20 Ω L = 1.5 H and $C=35 \mu F$ is connected to a variable frequency 200 V ac 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?
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Q 183 Marks Question3 Marks
An electric bulb is marked $220 V, 100 W$. Calculate : (i) resistance of the bulb (ii) peak voltage of the source (iii) rms current flowing through the bulb.
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Q 193 Marks Question3 Marks
A capacitor and a resistor are joined in series with an ac source. If voltage across the ends of $C$ and $R$ be 120 V and 90 V respectively and root mean square value of current is 3 A , then calculate (i) impedance (ii) power factor of the circuit.
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Q 203 Marks Question3 Marks
An ac circuit is made from series combination of components of circuits X and Y . Current is ahead of voltage by $\frac{\pi}{4}$. If component $X$ is pure resistor whose value is $100 \Omega$ then (i) what is the name of component $Y$ ? (ii) If root mean square value of voltage is 141 V , then find the root mean square value of the current.
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Q 225 Marks Questions5 Marks
(a) Prove that the peak value ( $I_m$ ) of an alternating current is $\sqrt{2}$ times its root mean square ( rms ) value.(b) If alternating current $I=4 sin \omega t$ of and voltage $V =200 \sin (\omega t+\pi / 3)$, calculate the dissipated average power in the circuit.
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Q 235 Marks Questions5 Marks
(a) Prove that the mean power supplied to the inductor in a complete cycle is zero. (b) If in an LCR alternatin current circuit $R =$ $24 \Omega, X _{ L }=110 \Omega$, and $X _{ C }=110 \Omega$, then find the impednce of the current.
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Q 245 Marks Questions5 Marks
(a) Obtain an expression for current flowing through an ideal inductor joined with an ac source of voltage $v=v_0 \sin \omega t$ by using phasor diagram. Draw a graph between (i) voltage applied and (ii) current as a function of (wt.).
(b) Obtain an expression for average power dissipation in any series LCR circuit.
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Q 265 Marks Questions5 Marks
Explain ac voltage applied on inductor and explain that when only pure inductor is joined in a circuit, the current lags emf by a phase angle of $\frac{\pi}{2}$.
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