ECAT Pre Engineering Physics Chapter 16 online mcq test with answers for chapter 16 (Alternating Current)

Physics ECAT Pre Engineering Chapter 16 Alternating Current Online Test

Sr. #	Questions	Answers Choice
1	When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency	9.4 kHz 940 kHz 94 kHz None of these
2	In free space, the speed of electromagnetic waves is	3 x 10<sup>8</sup>ms<sup>-1</sup> 3 x 10<sup>6</sup>ms<sup>-1</sup> 4 x 10<sup>7</sup>ms<sup>-1</sup> 3 x 10<sup>9</sup>ms<sup>-1</sup>
3	Transmitting antenna emits	Magnetic waves Electric waves Electromagnetic waves Sound waves
4	Electromagnetic waves transmit energy equal to	1/2 mv<sup>2</sup> m<sub>o</sub>c<sup>2</sup> hf/c hf
5	Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length	X-rays Ultraviolet rays y-rays Cosmic rays
6	Chock consumes externally small	Charge Current Power Potential
7	Which one of the following waves belongs to electromagnetic spectrum	Radio and TV waves Radar waves Micro waves All of them
8	In frequency modulation (FM), the carrier waves amplitude	Remains constant Increase Decreases None of these
9	If the value of C in a series RLC circuit is increased, the resonant frequency	Is not affected Increase Remains the same Decreases
10	The phase angle of a series RLC circuit at resonance is	180<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 90<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 0<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> None of the these
11	The total reactance of a series RLC circuit at resonance is	zero Equal to the resistance Infinity Capacitive
12	SI unit of impedance is	hertz henry ampere ohms
13	In series RC circuit when R=X_c, then the phase angle is	0<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 90<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 70<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 45<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
14	An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current	Decreases Increases Does not change Momentarily goes to zero
15	At resonance frequency the impedance of parallel resonance circuit is	Maximum Minimum Zero None of the above

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