Physics ECAT Pre Engineering MCQ's Test For Full Book With Answers

Physics ECAT Pre Engineering MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 Self inducede e.m.f. is also called Motional e.m.f. Thermistor Electrostatic induction Back e.m.f
2 A potential barrier of 0.7V exists across p-n junction made from: Germanium Silicon Arsenic Gallium Indium
3 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
4 Depletion region contains: Protons Positive ions Negative ions Both (B) and (C) Both (A) and (C)
5 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
6 The motional e.m.f depends upon the Length of a conductor Strength of a magnet Speed of the conductor All of the above
7 Back emf is produced due to Self induction Mutual induction A.C Lenz's law
8 The SI unit of magnetic induction is Weber Weber/meter Henry Tesla
9 Computer chips are made from: Iron Silicon Helium Stontium Aluminium
10 Transformer is used to Increase alternating current Increase d.c voltage Increase & Decrease emf All answers are right
11 Lenz's law is the consequence of Mass Energy conservation Momentum conservation Charge
12 The change of magnetic flux through a circuit will produce Magnetic Field Electric Field emf a.c
13 Whenever a covalent bond breaks, it creates: An electron A hole An electron-hole pair A positron All of these
14 Which of the following substances has got positive temperature coefficient of resistance? Carbon Germanium Silicon Aluminium None of these
15 A thermistor is a resistor which is: Light Sensitive Heat Sensitive Sound Sensitive All of these None of these
16 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
17 Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons Frequency Penetrating power Energy Method of creation
18 The emf is measured in: Newton Volt J/C Both A and B Both B and C
19 The quantity having the same unit as that of emf is: Force Energy Potential Current Charge
20 Which instrument is expensive and difficult to use? Voltmeter Potentiometer CRO Both A and C Both A and B
21 An ideal voltmeter has: Zero resistance Small resistance Large resistance Infinite resistance Both A and B
22 Kirchhoff's first rule is also called: Loop rule Thumb rule Point rule Right hand rule None of these
23 X-rays produced in a tube operating at 105V. The speed of X-rays produced is 3 x 10<sup>8</sup>m/s 3.1 x 10<sup>8</sup>m/s 2.8 x 10<sup>8</sup>m/s 1.88 x 10<sup>8</sup>m/s
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 In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is Helium Neon Both None of these
26 A rheostat can e used: As variable resistor As potential divider For varying the current All of these None of these
27 The value of the metastable state for Neon is 20.66eV 20.61eV 19.23eV 18.70eV
28 In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them Small Greater Equal Sometimes
29 The best conductor is: Silver Copper Aluminimum Both B and C None of them
30 X-ray are also known as Roentgen rays Maxwell rays Plank range Einstein rays
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