[{"id":15619,"question":"When we apply reverse bias to a junction diode it","choices":[{"text":"Lowers the potential barrier","value":"A"},{"text":"Raises the potential barrier","value":"B"},{"text":"Increase the majority carrier current","value":"C"},{"text":"Decrease the majority carrier current","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":15618,"question":"In a common base transistor circuit the current gain is 0.98.On changing the emitter current by 5.00 mA, the change in collector current is:","choices":[{"text":"0.196 mA","value":"A"},{"text":"2.45 mA","value":"B"},{"text":"4.9 mA","value":"C"},{"text":"5.1 mA","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":15617,"question":"In case of p-n junction diode at high value of reverse bias the current rises sharply The value of reverse bias is known as","choices":[{"text":"Cut off voltage","value":"A"},{"text":"Zener voltage","value":"B"},{"text":"Inverse voltage","value":"C"},{"text":"Critical voltage","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":15616,"question":"A cable breaks if stretched by more than 2 mm it is cut into two equal parts how much either part can be stretched without breaking?","choices":[{"text":"0.25 m","value":"A"},{"text":"0.5 m","value":"B"},{"text":"1 mm","value":"C"},{"text":"2 mm","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":15615,"question":"For obtaining appreciable extension the wire should be","choices":[{"text":"Short and thin","value":"A"},{"text":"Long and thin","value":"B"},{"text":"Short and tick","value":"C"},{"text":"Long and thick","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":15614,"question":"According to the Hooke's law the force required to change the length of a wire by '1' is proportional to","choices":[{"text":"1<sup>-2</sup>","value":"A"},{"text":"1<sup>-1</sup>","value":"B"},{"text":"1","value":"C"},{"text":"1<sup>2</sup>","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":15613,"question":"A wire is stretched to double of its length.The strain is","choices":[{"text":"2","value":"A"},{"text":"1","value":"B"},{"text":"Zero","value":"C"},{"text":"0.5","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":15612,"question":"How does the Young's modulus vary with the increase of temperature?","choices":[{"text":"Decrease","value":"A"},{"text":"Increase","value":"B"},{"text":"Remains constant","value":"C"},{"text":"First increases and then decreases","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":15611,"question":"The modulus of rigidity of a liquid is","choices":[{"text":"Zero","value":"A"},{"text":"1","value":"B"},{"text":"Infinity","value":"C"},{"text":"A value not one of those mentioned above","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":15610,"question":"Steel is preferred for making springs over copper.Whey?","choices":[{"text":"Steel is cheaper","value":"A"},{"text":"Young's modulus of steel is more than that of copper","value":"B"},{"text":"Young's modulus of copper is more than that of steel","value":"C"},{"text":"Steel is less likely to be oxidized","value":"D"},{"value":"E"}],"correctAnswer":2}]