Electricity and Magnetism Practice Quiz 09

Electricity and Magnetism Practice Quiz 09

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.
  • The correct answer will be reveal after you have chosen your answer for every questions
  • 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.
  • You can re-take the quiz as many times as you want or until you are satisfied of your rating.
  • Comment us your thoughts, scores, ratings, and questions about the quiz in the comments section below!

Choose the letter of the best answer in each questions.

A negatively charge body has
deficit of electrons
excess of protons
excess of electrons
deficit of neutrons

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 200-watt lamp working for 24 hours will consume approximately ________ units.
50
5
24
0.5

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!

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!

________ is a substance of whose molecules consist of the same kind of atom.
Mixture
Compound
Element
Isotope

Correct!

Wrong!

The electrons in the last orbit of an atom are called _______ electrons.
free
valence
bound
thermionic

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!

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!

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 eureka is
positive
negative
almost zero
infinite

Correct!

Wrong!

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!

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!

Ohm’s law cannot be applied to which material?
Copper
Silver
Silicon carbide
Aluminum

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 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!

The temperature coefficient of resistance of a conductor _________ with an increase in temperature.
increases
decreases
remains the same
becomes negative

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!

What is the SI unit of conductance?
Siemens
Mhos
Ohms
1/Ohms

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!

Core materials of a good relay have ________ hysteresis loop.
large
narrow
very large
very narrow

Correct!

Wrong!

The mass of proton is ________ the mass of an electron.
equal to
about 1837 times
less than
200 times

Correct!

Wrong!

What is the SI unit of conductivity?
Ohms/m
Ohms-m
Siemens-m
Siemens/m

Correct!

Wrong!

Under ordinary conditions, a body is considered
positively charged
neutral
negatively charged
stable

Correct!

Wrong!

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Electricity and Magnetism – Quiz 09

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