ECAT Pre General Science Online Test With Answers

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ECAT Pre General Science Online Test

Sr. # Questions Answers Choice
1 Light year is a unit of Time Distance Velocity Intensity of light
2 Silicon can be obtained from Lead Uranium An isotope of oxygen Sand
3 The values 1 and 0 are designated as: Continuous values Binary values Boolean values Decimal values Either (B) and (C)
4 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
5 In describing function of digital systems, 1 represents: Closed switch True Statement Lighted bulb Only (B) and (C) All are true
6 Which of the following is most suitable as the core of transformer Soft iron Alinco Steel None of these
7 The practical application of the phenomenon of Mutual induction is Transformers Generator Motor All of these
8 Inverter is the name given to: NOT gate OR gate NOR gate AND gate XOR gate
9 A device which converts Electrical energy into mechanical energy is called as Transformer Generator Motor All of these
10 A.C. can be measure with the help of Nuclear effect Magnetic effect Chemical effect Heating effect
11 An LED emits light when it is: Forward biased Reverse biased Operated without battery Operated with heat source None of these
12 Split rings act as Vibrator Resistor Motor Commulator
13 The work is stored in the inductor as Electric potential energy Elastic potential energy Magnetic energy Absolute potential energy
14 .Depletion region contains: Protons Positive ions Negative ions Both (B) and (C) Both (A) and (C)
15 Self inducede e.m.f. is also called Motional e.m.f. Thermistor Electrostatic induction Back e.m.f
16 A potential barrier of 0.7V exists across p-n junction made from: Germanium Silicon Arsenic Gallium Indium
17 The ratio of average e.m.f in the coil tot he time rate of change of current in the same coil is called Mutual induction Mutual inductance Capacitance Self inductance
18 Depletion region contains: Protons Positive ions Negative ions Both (B) and (C) Both (A) and (C)
19 Lens's law deals with the Magnitude of induced current Magnitude of induced e.m.f Direction of induced e.m.f Direction of induced current
20 The motional e.m.f depends upon the Length of a conductor Strength of a magnet Speed of the conductor All of the above
21 Back emf is produced due to Self induction Mutual induction A.C Lenz's law
22 The SI unit of magnetic induction is Weber Weber/meter Henry Tesla
23 Computer chips are made from: Iron Silicon Helium Stontium Aluminium
24 Transformer is used to Increase alternating current Increase d.c voltage Increase & Decrease emf All answers are right
25 Lenz's law is the consequence of Mass Energy conservation Momentum conservation Charge
26 The change of magnetic flux through a circuit will produce Magnetic Field Electric Field emf a.c
27 Whenever a covalent bond breaks, it creates: An electron A hole An electron-hole pair A positron All of these
28 Which of the following substances has got positive temperature coefficient of resistance? Carbon Germanium Silicon Aluminium None of these
29 A thermistor is a resistor which is: Light Sensitive Heat Sensitive Sound Sensitive All of these None of these
30 Thermistors are prepared under High pressure and low temperature High pressure and high temperature Low pressure and low temperature Low pressure and high temprature None of these
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