ECAT Physics Online Test With Answers

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ECAT Physics Online Test

Sr. # Questions Answers Choice
1 The work is stored in the inductor as Electric potential energy Elastic potential energy Magnetic energy Absolute potential energy
2 .Depletion region contains: Protons Positive ions Negative ions Both (B) and (C) Both (A) and (C)
3 Self inducede e.m.f. is also called Motional e.m.f. Thermistor Electrostatic induction Back e.m.f
4 A potential barrier of 0.7V exists across p-n junction made from: Germanium Silicon Arsenic Gallium Indium
5 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
6 Depletion region contains: Protons Positive ions Negative ions Both (B) and (C) Both (A) and (C)
7 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
8 The motional e.m.f depends upon the Length of a conductor Strength of a magnet Speed of the conductor All of the above
9 Back emf is produced due to Self induction Mutual induction A.C Lenz's law
10 The SI unit of magnetic induction is Weber Weber/meter Henry Tesla
11 Computer chips are made from: Iron Silicon Helium Stontium Aluminium
12 Transformer is used to Increase alternating current Increase d.c voltage Increase & Decrease emf All answers are right
13 Lenz's law is the consequence of Mass Energy conservation Momentum conservation Charge
14 The change of magnetic flux through a circuit will produce Magnetic Field Electric Field emf a.c
15 Whenever a covalent bond breaks, it creates: An electron A hole An electron-hole pair A positron All of these
16 Which of the following substances has got positive temperature coefficient of resistance? Carbon Germanium Silicon Aluminium None of these
17 A thermistor is a resistor which is: Light Sensitive Heat Sensitive Sound Sensitive All of these None of these
18 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
19 The emf is measured in: Newton Volt J/C Both A and B Both B and C
20 The quantity having the same unit as that of emf is: Force Energy Potential Current Charge
21 Which instrument is expensive and difficult to use? Voltmeter Potentiometer CRO Both A and C Both A and B
22 An ideal voltmeter has: Zero resistance Small resistance Large resistance Infinite resistance Both A and B
23 Kirchhoff's first rule is also called: Loop rule Thumb rule Point rule Right hand rule None of these
24 The third band of the colour code: Gives the number of zeroes Is decimal multiplier Gives the resistance tolerance Gives the third digit Both (A) and (B)
25 A rheostat can e used: As variable resistor As potential divider For varying the current All of these None of these
26 The best conductor is: Silver Copper Aluminimum Both B and C None of them
27 As the current flows through the wire It generates heat in the wire It produces sound in the wire Resistance of the wire decrease Voltage across the ends is the increase None of these
28 The fourth band is a: Silver band Red band Gold band Either A or C Either A or B
29 The value of resistivity is the least for: Copper Aluminimum Silver Tungsten Iron
30 In a metal, the valence electrons are: Attached to individual atoms Not attached to individual atoms Free to move within the metal Both A and B Both A and C
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