ECAT Physics Online Test With Answers

ECAT Physics Online Test

Sr. # Questions Answers Choice
1 Michael Faraday is known by his work on Nuclear strong force Gravitational force Nuclear weak force Electric force None of these
2 The concept of electric field theory was introduced by Michael Faraday Newton Dalton Kepler Einstein
3 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.
4 If the distance between two charges is doubled, the force between them will become Double Half Three times One fourth One third
5 In a transistor, collector current is controlled by Collector voltage Base current Collector resistance All of the above
6 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
7 When transistors are used in digital circuits they usually operate in the Active region Breakdown region Saturation and cutoff regions Linear region
8 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
9 The reverse saturation current in a PN junction diode is only due to Majority carriers Minority Carriers Acceptor ions Donor ions
10 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
11 The induced current in a conductor depends upon Resistance of the loop Speed with which the conductor moves Any of these Both A and B None of these
12 The Phenomenon of generation of induced emf is called Electrostatic induction Magnetic induction Electromagnetic induction Electric induction Both A and B
13 An induced current can be produced by Constant magnetic field Changing magnetic field Varying electric field Constant electric field None of these
14 An emf is set up in a conductor when it Is kept in a magnetic field Is kept in an electric field Moves across a magnetic field Both A and B None of these
15 The current produced by moving a loop of wire across a magnetic field is called Direct current Magnetic current Alternating current Induced current None of these
16 The charge carriers in an electrolyte are Positive ions Negative ions Either A or B Both A and B Neither A nor B
17 In case of metallic conductors, the charge carriers are Protons Electrons Antiprotons Positrons Both A and B
18 SI unit of current describes the flow of charge at the rate of One ampere per second One coulomb per second One electron per second 6.25 x 10<sup>18</sup>electrons per second Both B and D
19 The current that flows through the coil of a motor causes Its shaft to revolve Its brushes to rotate Motor to move Its shaft to rotate None of these
20 Most practical applications of electricity involve Charges at rest Charges in motion Electrons at rest Atoms in motion Molecules in motion
21 The values 1 and 0 are designated as: Continuous values Binary values Boolean values Decimal values Either (B) and (C)
22 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
23 In describing function of digital systems, 1 represents: Closed switch True Statement Lighted bulb Only (B) and (C) All are true
24 Which of the following is most suitable as the core of transformer Soft iron Alinco Steel None of these
25 The practical application of the phenomenon of Mutual induction is Transformers Generator Motor All of these
26 Inverter is the name given to: NOT gate OR gate NOR gate AND gate XOR gate
27 A device which converts Electrical energy into mechanical energy is called as Transformer Generator Motor All of these
28 A.C. can be measure with the help of Nuclear effect Magnetic effect Chemical effect Heating effect
29 An LED emits light when it is: Forward biased Reverse biased Operated without battery Operated with heat source None of these
30 Split rings act as Vibrator Resistor Motor Commulator
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