ECAT Pre General Science Physics Chapter 18 Electronics Online Test With Answers

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ECAT Pre General Science Physics Chapter 18 Electronics Online Test

Sr. # Questions Answers Choice
1 Electric lines of force Intersect each other Are always parallel Are always anti-parallel Never intersect None of these
2 The electric field lines start from Positive charge Negative charge Either A or B Neutron An atom
3 The SI unit of charge is Ampere Watt Coulomb Volt Joule
4 The intensity at a point due to a charge is inversely proportional to Amount of charge Size of the charge Distance between charge and the point Square of the distance from the charge None of these
5 Electric intensity at a place due to a charged conductor is a Scalar quantity Vector quantity Semi vector and semi scalar Dimensionless quantity Both A and D are true
6 Electric field strength is defined as Work done on unit charge Force exerted on unit charge Distance covered by unit charge Power exerted by unit charge None of these
7 Michael Faraday is known by his work on Nuclear strong force Gravitational force Nuclear weak force Electric force None of these
8 The concept of electric field theory was introduced by Michael Faraday Newton Dalton Kepler Einstein
9 Origin of the electric and the gravitational forces Was known in 1911 A.D. Was known in 1811 A.D. Was known in 1711 A.D. is still unknown Was known in 1611 A.D.
10 If the distance between two charges is doubled, the force between them will become Double Half Three times One fourth One third
11 In a transistor, collector current is controlled by Collector voltage Base current Collector resistance All of the above
12 Most of the electrons in the base of an NPN transistor flow Out of the base lead Into the collector Into the emit Into the base supply
13 When transistors are used in digital circuits they usually operate in the Active region Breakdown region Saturation and cutoff regions Linear region
14 Improper biasing of a transistor circuit produces Heavy loading of emitter current Distortion in the output signal Excessive heat at collector terminal Faulty location of load line
15 The reverse saturation current in a PN junction diode is only due to Majority carriers Minority Carriers Acceptor ions Donor ions
16 In an N-type silicon, which of the following statement is true Electrons are majority carriers and trivalent atoms are the dopants Electrons are minority carriers and pentavalent atoms are the dopants Holes are minority carriers and pentavalent atoms are the dopants Holes are majority carriers and trivalent atoms are the dopants
17 The values 1 and 0 are designated as: Continuous values Binary values Boolean values Decimal values Either (B) and (C)
18 The value of LDR depends upon intensity of: Sound falling on it Current passing through it Magnetic field surrounding it Light falling on it Non of these
19 In describing function of digital systems, 1 represents: Closed switch True Statement Lighted bulb Only (B) and (C) All are true
20 Inverter is the name given to: NOT gate OR gate NOR gate AND gate XOR gate
21 An LED emits light when it is: Forward biased Reverse biased Operated without battery Operated with heat source None of these
22 .Depletion region contains: Protons Positive ions Negative ions Both (B) and (C) Both (A) and (C)
23 A potential barrier of 0.7V exists across p-n junction made from: Germanium Silicon Arsenic Gallium Indium
24 Depletion region contains: Protons Positive ions Negative ions Both (B) and (C) Both (A) and (C)
25 Computer chips are made from: Iron Silicon Helium Stontium Aluminium
26 Whenever a covalent bond breaks, it creates: An electron A hole An electron-hole pair A positron All of these
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