Test Preparation on UGC NET Electronic Science Mock Test-1
Assertion (A) : Brewster angle isthe angle of incidence at whichthere is no reflection.Reason (R) : For parallelpolarisation, Brewster angle isgiven by following expression :
Assertion (A) : An EDFA is usuallypumped at 980 nm wavelength,which means that Erbium ionsat ground level absorb energy.Reason (R) : This absorbedenergy is transferred to highfrequency signals to boost up.
Assertion (A) : D-flip-flops areused as buffer register.Reason (R) : Flip-flops are freefrom ?race-around? condition.
Assertion (A) : Routh Hurwitzcriterion gives both absolute aswell as relative stability usingcharacteristic equation.Reason (R) : For a system to bestable all roots of characteristicequation must lie in left half ofs-plane.
Assertion (A) : Considering twop-n-p and n-p-n transistors ofidentical construction as far asshape, size and doping areconcerned, the n-p-n transistorwill have a better frequencyresponse.Reason (R) : The electronmobility is higher than that ofthe hole mobility.