Q. What is an energy gap ?
1) The energy equal to the energy acquired by an electron passing a IV electric field
2) Energy difference between conduction band and valence band
3) An energy level at which an electron can exist
4) The space between two orbital shell
Q. A potentiometer may be used for -
1) Measurement of energy
2) Measurement of resistance
3) Calibration of ammeter and voltmeter
4) Measurement of current
Q. As compared to oscillators an inverter provides -
1) low voltage output
2) noiseless output
3) noiseoless output
4) distortionless output
Q. The multiplier and the meter coil in a voltmeter are connected in -
1) No connection
2) Mixed
3) Series
4) Parallel
Q. A coil having an inductance of 75 H is carrying a current of 100 A. If the current is reduced to zero in 0.2 second, the self-inductance e.m.f. will be -
1) 375 V
2) 500 V
3) 125 V
4) 750 V
Q. Which semi-conductor deice acts like a diode and two resistors ?
1) SCR
2) Diac
3) Triac
4) UJT
Q. What type of magnetic behaviours is observed in a type I superconductor ?
1) perfect diamagnetism
2) perfect ferrimagnetism
3) perfect ferromagnetism
4) perfect paramagnetism
Q. Step-up transformers are used for-
1) increasing electrical power
2) decreasing electrical power
3) decreasing voltage
4) increasing voltage
Q. Which one of the following statements about energy is correct ?
1) Energy can be created as well as destroyed
2) Energy can be created but not destroyed
3) Energy can neither be created nor destroyed
4) Energy cannot be created but can be destroyed
Q. Which one among the following waves carries the maximum energy per photon ?
1) X-rays
2) Radio waves
3) Light waves
4) Microwaves
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