ECAT Pre Engineering Physics Chapter 18 online mcq test with answers for chapter 18 (Electronics)

Physics ECAT Pre Engineering Chapter 18 Electronics Physics Online Test

Sr. #	Questions	Answers Choice
1	A diode which can turn its current ON and OFF in nono seconds is called:	LED Photodiode An ordinary diode. Both (A) and (B) Both (B) and (C)
2	In full wave rectification, simultaneous action is that:	Two diodes conduct and two do not. One diode conduct and three do not. Three diodes conduct and one does not. All the four diodes conduct None of these
3	In reverse-biased p-n junction, the reverse current is due to flow of:	Minority charge carriers Majority charge carriers Free electrons from p to n-region Holes from n to p-region all are true except (B)
4	In the forward biases situation, the current flowing across the p-n junction is a few:	amperes Milli amperes Micro amperes Pico amperes None of these
5	A potential barrier of 0.7 V exists across p-n junction made from:	Germanium Silicon Arsenic Gallium Indium
6	A hole in p-type my be due to:	Trivalent impurity Breking of some covalent bond Pentavalent impurity Germanium Either (A) or (B)
7	Majority charge carriers in the p-region of p-n junction are:	electrons positrons Holes Neutrons None of these
8	All the valence electrons present in a crystal of silicon are bound in their orbits by	Ionic bond covalent bond Molecular bond Both (A) and (B) Both (B) and (C)
9	Crystal of germanium or silicon in its pure form at absolute zero acts as:	A conductor A semiconductor an insulator Both (A) and (C) Both (A) and (B)
10	The use of chips in electrons is described in the form of:	Yellow boxes Black boxes Red boxes White boxes Orange boxes
11	Silicon is one of the mot commonly used:	onductor Dielectric Insulator Semiconduction Both (B) and (C)
12	Field lines are closer to each other in the region where the filed is	Stronger Weaker Much weaker Absent None of these
13	Electric field lines emerge from the charges in	One dimension Two dimensions Three dimensions Four dimensions None of these
14	The value of relative permittivity of different dielectrics are	Equal Different Greater than one Smaller than one Both B and C
15	By placing a dielectric in between the charges, the electrostatic force between them	Is always reduced Is always increased Is not affected Is increased one million times None of these

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