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Revision Quiz on Alternating Current & Electromagnetic Waves

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Question 1

In a complicated circuit of piezoelectric ultrasound generator, a 64μF capacitor (initially charged) is connected to a 16 mH inductor. What will be the angular frequency of free oscillations of this circuit for generation of ultrasonic sound?

Question 2

As given circuit below in figure what will be the value of inductive reactanceif the source voltage is

Question 3

What will be the reading of the voltmeter across the resistance and ammeter in the circuit shown in the figure?

Question 4

In a series resonant LCR circuit the voltage across resistance (R) is 100 volts and with . The resonant frequency is.
At resonance the voltage across inductor (L) is

Question 5

When an alternating voltage of 220 V is applied across a resistor a current of 0.5 A flows through the circuit and is in phase with the applied voltage. When the same voltage is applied across capacitor the same current flow but it leads the voltage by. When capacitor and resistor are arranged in series combination and the same voltage is applied what is the current in the circuit.

Question 6

When 100 V DC is applied across a solenoid a current of 1 Amp flows in it. When 100 V AC is applied across the same coil the current drop to 0.5 Amp. The frequency of the AC is 50 Hz. What will be the impedance and inductance of the solenoid are

Question 7

A coil, a capacitor and an AC source of voltage 24 V (rms) are connected in series. By varying the frequency of the source a maximum rms current of 6 A is observed. If this coil is connected to a battery of emf 12 V and internal resistance 4 then the current pass through it will be

Question 8

The arrangement shown here are having a capacitance of 40mF and two inductors and If the capacitor initially carries a charge of , then which is incorrect statements

Question 9

When an electric heater is switched On, a bulb in parallel becomes dim . Its dimness after sometime:

Question 10

A parallel beam of light is incident normally on a plane surface absorbing 40% of the light and reflecting the rest. If the incident beam carries 60W of power, the force exerted by it on the surface is

Question 11

If denote microwaves, X rays, infrared, gamma rays, ultra-violet, radio waves and visible parts of the electromagnetic spectrum by M, X, I, G, U, R and V, the following is the arrangement in ascending order of wavelength :

Question 12

Match List I (wavelength range of electromagnetic spectrum) with List II. (Method of production of these waves) and select the correct option from the options given below the lists.
List I List II
(a) 700 nm to 1 nm (i) Vibrations of atoms and molecule
(b) 1 nm to 400 nm (ii) Inner shell electron in atom moving from one energy level to lower level.
(c)  <0.0001 nm (iii) Radioactive decay of the nucleus
(d) 1 mm to 0.1 m (iv) Magnetron value

Question 13

Match List-I (Electromagnetic wave type) with List-II (Its association / application) and select the correct option from the choices given below the lists :

Question 14

A parallel plate air gap capacitor is made up of two plates of areaeach kept at a distance of. A sine wave of amplitude 10 V and frequency 50 Hz is applied across the capacitor as shown in the figure. The amplitude of the displacement current density in between the plates will be closest to

Question 15

A uniform wire of length l and radius r has a resistance of 100 Ω. It is recast into a wire of radius , The resistance of new wire will be:
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Nov 27JEE & BITSAT