Welcome to ECE Board Exam Practice Quiz for Electricity and Magnetism Fundamentals. This set of practice quiz 9 will test your competence on the theories, concepts and problem solving involving Electricity and Magnetism. The objectives and goals of this quiz is to help engineering students familiarize concepts and theories as well as develop problem solving skills when answering questions related to the Electricity and Magnetism Fundamentals.
Electricity and Magnetism Test Bank
In this section are compiled practice quiz for Electricity and Magnetism that could be able to enhance your knowledge and skills in your preparation for the ECE Board Exam. The goal is to add thousands of questions for you to be familiarized and hopefully help you to be prepared. I am looking forward that this practice quiz will give you an additional confidence in taking your upcoming Engineering Board Exam.
Guidelines:
- Read and understand each question before choosing the best answer.
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- There is no time limit, answer the questions at your own pace.
- Once all questions are answered, you will be shown your rating.
- You have to get 70% of the total items to pass the quiz.
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Choose the letter of the best answer in each questions.
What is the SI unit of specific resistance or resistivity?
Ohm-circular mil per inch
Ohm-circular mil per foot
Ohm-m
Ohm-cm
Correct!
Wrong!
Under ordinary conditions, a body is considered
positively charged
neutral
negatively charged
stable
Correct!
Wrong!
If the number of valence electrons of an atom is less than 4, then the substance is probably
a metal
an insulator
a non-metal
a semiconductor
Correct!
Wrong!
The temperature coefficient of resistance of a conductor _________ with an increase in temperature.
increases
decreases
remains the same
becomes negative
Correct!
Wrong!
Ohm’s law cannot be applied to which material?
Copper
Silver
Silicon carbide
Aluminum
Correct!
Wrong!
If two similar charges 1 coulomb each are placed 1 m apart in air, then the force of repulsion is
8 × 10^6 N
9 × 10^9 N
10^6 N
5 × 10^6 N
Correct!
Wrong!
The force between two charges placed a given distance apart ______ as the relative permittivity of the medium is increased.
increases
decreases
remains unchanged
becomes infinite
Correct!
Wrong!
The temperature coefficient of resistance of eureka is
positive
negative
almost zero
infinite
Correct!
Wrong!
Hysteresis is a phenomenon of _______ in a magnetic circuit.
setting up constant flux
lagging of H behind B
lagging B behind H
leading B ahead H
Correct!
Wrong!
________ is a substance of whose molecules consist of the same kind of atom.
Mixture
Compound
Element
Isotope
Correct!
Wrong!
A negatively charge body has
deficit of electrons
excess of protons
excess of electrons
deficit of neutrons
Correct!
Wrong!
The electrons in the last orbit of an atom are called _______ electrons.
free
valence
bound
thermionic
Correct!
Wrong!
A 200-watt lamp working for 24 hours will consume approximately ________ units.
50
5
24
0.5
Correct!
Wrong!
Electromotive force in a circuit
causes free electrons to flow
increases the circuit resistance
maintains circuit resistance
is needed to make the circuit complete
Correct!
Wrong!
What is the SI unit of conductance?
Siemens
Mhos
Ohms
1/Ohms
Correct!
Wrong!
The mass of proton is ________ the mass of an electron.
equal to
about 1837 times
less than
200 times
Correct!
Wrong!
If the value of α25 a conductor is 1/255 per °C, then the value of α20 is
1/300 per °C
1/250 per °C
1/230 per °C
1/260 per °C
Correct!
Wrong!
Core materials of a good relay have ________ hysteresis loop.
large
narrow
very large
very narrow
Correct!
Wrong!
If the number of valence electrons of an atom is more than 4, the substance is called
a semiconductor
a conductor
an insulator
a semi-insulator
Correct!
Wrong!
A one cubic cm of copper has how many free electrons at room temperature?
80 × 10^18
8.5 × 10^22
20 × 10^10
50 × 10^20
Correct!
Wrong!
What is the SI unit of conductivity?
Ohms/m
Ohms-m
Siemens-m
Siemens/m
Correct!
Wrong!
What is the value of the absolute permittivity of air?
8.854 μF/m
8.854 × 10^-12 mF/m
8.854 × 10^-12 F/m
8.854 × 10^-12 μF/m
Correct!
Wrong!
The temperature coefficient of resistance of semiconductors is
positive
zero
negative
infinite
Correct!
Wrong!
If the length and area of cross-section of a wire are doubled, then its resistance
becomes four times
becomes sixteen times
remains the same
becomes two times
Correct!
Wrong!
If the magnetic material is located within a coil through which alternating current (60 Hz frequency) flows, then ________ hysteresis loops will be formed every second.
60
120
30
180
Correct!
Wrong!
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Electricity and Magnetism – Quiz 09
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