[{"id":111085,"question":"The electric field intensity at a point due to a point charge","choices":[{"text":"Falls off inversely as the distance","value":"A"},{"text":"Falls off inversely as the square of distance","value":"B"},{"text":"Remains unchanged with distance","value":"C"},{"text":"Increase directly as square of distance","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111082,"question":"Coulomb's force between two point charges depends upon","choices":[{"text":"Magnitude of charges","value":"A"},{"text":"Distance between them","value":"B"},{"text":"Medium in which they are located","value":"C"},{"text":"All of the above","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111080,"question":"The concept of field theory was put forward by","choices":[{"text":"Franklin","value":"A"},{"text":"Kepler","value":"B"},{"text":"Oersted","value":"C"},{"text":"Michael Faraday","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111079,"question":"The value of electrical constant of proportionality k is","choices":[{"text":"9 x 10<sup>9</sup>Nm<sup>2</sup>C<sup>-2</sup>","value":"A"},{"text":"9 x 10<sup>-9</sup>Nm<sup>2</sup>C<sup>-2</sup>","value":"B"},{"text":"9 x 10<sup>10</sup>Nm<sup>2</sup>C<sup>2</sup>","value":"C"},{"text":"9.85 x 10<sup>-12</sup>N<sup>-1</sup>C<sup>-2</sup>","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111077,"question":"The SI unit of permitivity is","choices":[{"text":"Nm<sup>2</sup>C<sup>2</sup>","value":"A"},{"text":"N<sup>-1</sup>m<sup>-2</sup>C<sup>2</sup>","value":"B"},{"text":"NmC<sup>2</sup>","value":"C"},{"text":"Nm<sup>2</sup>C<sup>-1</sup>","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111076,"question":"If the two charges in Coulomb's law have double distance between them, then electric force","choices":[{"text":"Becomes two-fold","value":"A"},{"text":"Becomes four-fold","value":"B"},{"text":"Remains the same","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111066,"question":"Which of the following diode is used for the detection of light","choices":[{"text":"photo diode","value":"A"},{"text":"light emitting diode","value":"B"},{"text":"photo voltaic cell","value":"C"},{"text":"all of them","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111060,"question":"In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.","choices":[{"text":"photo diode","value":"A"},{"text":"light emitting diode","value":"B"},{"text":"photo voltaic cell","value":"C"},{"text":"all of them","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111055,"question":"In which of the following components, pn-junction is used","choices":[{"text":"light emitting diode","value":"A"},{"text":"photo diode","value":"B"},{"text":"photo voltaic cell","value":"C"},{"text":"all of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111054,"question":"The circuit which is used to smooth the output voltage of the full-wave rectification is known as","choices":[{"text":"transformer","value":"A"},{"text":"rectifier","value":"B"},{"text":"filter","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111053,"question":"The bridge circuit of full wave rectification uses","choices":[{"text":"one diode","value":"A"},{"text":"two diode","value":"B"},{"text":"three diode","value":"C"},{"text":"four diode","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111051,"question":"In half wave rectification","choices":[{"text":"both halves of the input voltage is used","value":"A"},{"text":"only one half of the input voltage is used","value":"B"},{"text":"either of these","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111050,"question":"During the negative half-cycle of the half-wave rectification, the diode","choices":[{"text":"does not conduct","value":"A"},{"text":"conducts","value":"B"},{"text":"either of these","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111048,"question":"During the positive half-cycle in the half-wave rectification,the diode","choices":[{"text":"does not conduct","value":"A"},{"text":"conducts","value":"B"},{"text":"either of these","value":"C"},{"text":"neither of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111045,"question":"The output voltage of half wave rectification is in the form of","choices":[{"text":"a smooth curve","value":"A"},{"text":"a smooth wave","value":"B"},{"text":"pulses","value":"C"},{"text":"all of the above","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111043,"question":"Conversion of alternating current into direct current is called","choices":[{"text":"amplification","value":"A"},{"text":"rectification","value":"B"},{"text":"conduction","value":"C"},{"text":"polarization","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111042,"question":"A diode characteristic curve is a plot between","choices":[{"text":"current and time","value":"A"},{"text":"voltage and time","value":"B"},{"text":"voltage and current","value":"C"},{"text":"forward voltage and reversed voltage","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111040,"question":"When the pn-junction is connected reversed biased, its resistance is of the order of","choices":[{"text":"few ohms","value":"A"},{"text":"few kilo-ohms","value":"B"},{"text":"few mega-ohms","value":"C"},{"text":"few mili-ohms","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111037,"question":"When the pn-junction is in reversed biased, current flows through the junction due to the","choices":[{"text":"majority carriers","value":"A"},{"text":"minority carriers","value":"B"},{"text":"either of them","value":"C"},{"text":"none of them","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111035,"question":"When the pn-junction is forward biased. the current flows through it is of the order of","choices":[{"text":"mili-amperes","value":"A"},{"text":"amperes","value":"B"},{"text":"nano-amperes","value":"C"},{"text":"micro-amperes","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111034,"question":"When the p-n junction is forward biased its resistance is of the order of","choices":[{"text":"few mega ohms","value":"A"},{"text":"few kilo ohms","value":"B"},{"text":"few ohms","value":"C"},{"text":"few milli ohms","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111033,"question":"The value of the potential difference across the depletion region for the case of germanium is","choices":[{"text":"0.3 V","value":"A"},{"text":"0.5 V","value":"B"},{"text":"0.7 V","value":"C"},{"text":"0.9 V","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111032,"question":"A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from","choices":[{"text":"2nd group","value":"A"},{"text":"fourth group","value":"B"},{"text":"fifth group","value":"C"},{"text":"sixth group","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111030,"question":"Average value of A.C voltage during one cycle is","choices":[{"text":"1","value":"A"},{"text":"Zero","value":"B"},{"text":"Maximum","value":"C"},{"text":"Variable","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111029,"question":"A changing magnetic flux creates around itself","choices":[{"text":"An electromotive force","value":"A"},{"text":"An electric field (changing electric flux)","value":"B"},{"text":"Magnetic field","value":"C"},{"text":"None of the above","value":"D"},{"value":"E"}],"correctAnswer":2},{"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}]