[{"id":111028,"question":"When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency","choices":[{"text":"9.4 kHz","value":"A"},{"text":"940 kHz","value":"B"},{"text":"94 kHz","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111026,"question":"In free space, the speed of electromagnetic waves is","choices":[{"text":"3 x 10<sup>8</sup>ms<sup>-1</sup>","value":"A"},{"text":"3 x 10<sup>6</sup>ms<sup>-1</sup>","value":"B"},{"text":"4 x 10<sup>7</sup>ms<sup>-1</sup>","value":"C"},{"text":"3 x 10<sup>9</sup>ms<sup>-1</sup>","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111024,"question":"Transmitting antenna emits","choices":[{"text":"Magnetic waves","value":"A"},{"text":"Electric waves","value":"B"},{"text":"Electromagnetic waves","value":"C"},{"text":"Sound waves","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111023,"question":"Electromagnetic waves transmit energy equal to","choices":[{"text":"1/2 mv<sup>2</sup>","value":"A"},{"text":"m<sub>o</sub>c<sup>2</sup>","value":"B"},{"text":"hf/c","value":"C"},{"text":"hf","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111022,"question":"Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length","choices":[{"text":"X-rays","value":"A"},{"text":"Ultraviolet rays","value":"B"},{"text":"y-rays","value":"C"},{"text":"Cosmic rays","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111021,"question":"Chock consumes externally small","choices":[{"text":"Charge","value":"A"},{"text":"Current","value":"B"},{"text":"Power","value":"C"},{"text":"Potential","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111020,"question":"Which one of the following waves belongs to electromagnetic spectrum","choices":[{"text":"Radio and TV waves","value":"A"},{"text":"Radar waves","value":"B"},{"text":"Micro waves","value":"C"},{"text":"All of them","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111019,"question":"In frequency modulation (FM), the carrier waves amplitude","choices":[{"text":"Remains constant","value":"A"},{"text":"Increase","value":"B"},{"text":"Decreases","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111017,"question":"If the value of C in a series RLC circuit is increased, the resonant frequency","choices":[{"text":"Is not affected","value":"A"},{"text":"Increase","value":"B"},{"text":"Remains the same","value":"C"},{"text":"Decreases","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111016,"question":"The phase angle of a series RLC circuit at resonance is","choices":[{"text":"180<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"A"},{"text":"90<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"B"},{"text":"0<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"C"},{"text":"None of the these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111015,"question":"The total reactance of a series RLC circuit at resonance is","choices":[{"text":"zero","value":"A"},{"text":"Equal to the resistance","value":"B"},{"text":"Infinity","value":"C"},{"text":"Capacitive","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111014,"question":"SI unit of impedance is","choices":[{"text":"hertz","value":"A"},{"text":"henry","value":"B"},{"text":"ampere","value":"C"},{"text":"ohms","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111013,"question":"In series RC circuit when R=X<sub>c</sub>, then the phase angle is","choices":[{"text":"0<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"A"},{"text":"90<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"B"},{"text":"70<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"C"},{"text":"45<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111012,"question":"An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current","choices":[{"text":"Decreases","value":"A"},{"text":"Increases","value":"B"},{"text":"Does not change","value":"C"},{"text":"Momentarily goes to zero","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111009,"question":"At resonance frequency the impedance of parallel resonance circuit is","choices":[{"text":"Maximum","value":"A"},{"text":"Minimum","value":"B"},{"text":"Zero","value":"C"},{"text":"None of the above","value":"D"},{"value":"E"}],"correctAnswer":1}]