[{"id":146138,"question":"When boron is added as an impurity to silicon, the resulting material is.","choices":[{"text":"n type conductor","value":"A"},{"text":"n type semiconductor","value":"B"},{"text":"p-type conductor","value":"C"},{"text":"p-type semiconductor","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":146137,"question":"When we apply reverse bias to a junction diode, it","choices":[{"text":"Lowers the potential barrier","value":"A"},{"text":"Raise the potential barrier","value":"B"},{"text":"Increase the majority carrier current","value":"C"},{"text":"Increase the minority carrier current","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":146136,"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":"0.916 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":146135,"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":146134,"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":146133,"question":"A cable that can support a load W is cut into two equal parts. The maximum load that can be supported by either part is:","choices":[{"text":"W/4","value":"A"},{"text":"W/2","value":"B"},{"text":"W","value":"C"},{"text":"2W","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":146132,"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 thick","value":"C"},{"text":"Long and thick","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":146131,"question":"According to the Hooke's law the force required to change the length of a wire by 'I' is proportional to","choices":[{"text":"I<sup>-2</sup>","value":"A"},{"text":"I<sup>-1</sup>","value":"B"},{"text":"I","value":"C"},{"text":"I<sup>2</sup>","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":146130,"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":146129,"question":"How does the Young's modulus vary with the increase of temperature?","choices":[{"text":"Decrease","value":"A"},{"text":"Increases","value":"B"},{"text":"Remains constant","value":"C"},{"text":"First increases and then decreases","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":146128,"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":146127,"question":"Steel is preferred for making springs over copper. Why?","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 ot be oxidized","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":146126,"question":"Which of the modulus of elasticity is involved in compression a rod to decrease its length?","choices":[{"text":"Young's modulus","value":"A"},{"text":"Bulk modulus","value":"B"},{"text":"Modulus of rigidity","value":"C"},{"text":"None of the above","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":146125,"question":"The dimensional formula for the modulus of elasticity is same as that for:","choices":[{"text":"Stress","value":"A"},{"text":"Strain","value":"B"},{"text":"Velocity","value":"C"},{"text":"Surface tension","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":146124,"question":"The henry is the unit for","choices":[{"text":"Resistance","value":"A"},{"text":"Magnetic flux","value":"B"},{"text":"Magnetic field","value":"C"},{"text":"Inductance","value":"D"},{"value":"E"}],"correctAnswer":4}]