Junior Scientific Officer Electronics Paper 2016 By UPSC

Directorate General of Aeronautical Quality Assurance Junior Scientific Officer Electronics Engineering Paper 2016 Exam conducted by UPSC
Exam Date – 20th Nov 2016

Above absolute zero Kelvin, silicon in its purest form behaves as
(a) Intrinsic semiconductor
(b) Extrinsic semiconductor
(c) Conductor
(d) An insulator

The core of an electromagnet requires
(a) Hard magnetic material
(b) Piezo resistive material
(c) Soft magnetic material
(d) Polymer polystyrene

The pure iron exists at room temperature as a body-centered-cubic structure. What is its packing factor?
(a) 0.87
(b) 0.74
(c) 0.68
(d) 0.52

In an instrinsic semiconductor, braking of a covalent bond results in the generation of
(a) An electron in the conduction band and a hole in the valence band
(b) An electron in the valence band and a hole in the conduction band
(c) An electron and a hole in the conduction band
(d) An electron and a hole in the valence band

When a group III impurity is doped into silicon
(a) Holes become majority
(b) Electrons become majority
(c) Either holes or electrons may become majority
(d) Concept majority of charge carrier can be decided

An active filter uses
(a) Resistors and inductors
(b) Resistors and capacitors
(c) Inductors only
(d) Capacitors only

In a normal operation of a PNP transistor
(a) Its both junctions are forward biased
(b) Its both junctions are reverse biased
(c) Its emitter base is reverse biased and collector base is forward biased
(d) Its emitter base is forward biased and collector base is reverse biased

If the pahse of a signal x[n] is reversed but its mangitude spectrum remains the same then the signal is
(a) Scaled
(b) Shifted in frequency domain
(c) Shifted in time domain
(d) Folded

In a set of signals, if no signal can be represented as a linear combination of the remaining signals, then such signals are termed as
(a) Linearly independent
(b) Linearly dependent
(c) Orthogonal
(d) Ortho-normal

A system which has a unique relationship between its input and output is called
(a) Linear system
(b) Causal system
(c) Time invariant system
(d) Invertible system