Electronics & Communication Quiz - 2
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Relative permeability of air is
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1
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2
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3
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4
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This is a very elementary Quiz containing questions from Solid State Devices, Basic Electronics, etc
Quiz Preview
- 2.
Who discovered Electron?
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Thomas Alva Edison
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Michael Faraday
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Alexander G. Bell
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J. J. Thomson
Correct Answer
A. J. J. ThomsonExplanation
J. J. Thomson discovered the electron. He conducted experiments using cathode ray tubes and observed that they emitted negatively charged particles. He concluded that these particles were fundamental units of electricity, which he named electrons. Thomson's discovery of the electron revolutionized the understanding of atomic structure and laid the foundation for the development of modern physics.Rate this question:
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- 3.
What is the unit of Inductor ?
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Ohms
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Henry
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Farad
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Radians
Correct Answer
A. HenryExplanation
The unit of inductor is Henry. An inductor is a passive electronic component that stores energy in its magnetic field when an electric current flows through it. The unit Henry is named after Joseph Henry, an American scientist who made significant contributions to the study of electromagnetism. It represents the amount of inductance, which is a measure of how much magnetic flux is generated for a given current.Rate this question:
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- 4.
What is the unit of energy ?
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Watt
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Joules
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V/m
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C/m^2
Correct Answer
A. JoulesExplanation
Joules is the correct answer for the unit of energy. Energy is measured in joules, which is a derived unit in the International System of Units (SI). It is named after James Prescott Joule, a British physicist who made significant contributions to the study of energy. The joule is defined as the amount of energy transferred when a force of one newton is applied over a distance of one meter. It is commonly used to measure various forms of energy such as mechanical, electrical, and thermal energy.Rate this question:
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- 5.
What is 1 eV of energy?
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1Joules
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0.1Joules
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0.001Joules
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1.6*10^-19Joules
Correct Answer
A. 1.6*10^-19JoulesExplanation
1 eV of energy is equal to 1.6*10^-19 Joules. The electronvolt (eV) is a unit of energy commonly used in atomic and nuclear physics. It represents the amount of energy gained or lost by an electron when it moves through an electric potential difference of 1 volt. The conversion factor between eV and Joules is 1 eV = 1.6*10^-19 Joules. Therefore, 1 eV is equal to 1.6*10^-19 Joules.Rate this question:
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- 6.
Value of µo is
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1H/m
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2H/m
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4π×10^-7 H/m
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5H/m
Correct Answer
A. 4π×10^-7 H/mExplanation
The value of µo is 4π×10^-7 H/m. This is because µo, also known as the permeability of free space, is a constant that represents the magnetic permeability of a vacuum. It is defined as the ratio of the magnetic field strength to the magnetic flux density. In the SI system, the value of µo is approximately equal to 4π×10^-7 H/m.Rate this question:
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- 7.
(1/2)mv^2
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Kinetic energy
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Potential energy
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Thermal energy
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None
Correct Answer
A. Kinetic energyExplanation
The equation (1/2)mv^2 represents the formula for calculating kinetic energy. Kinetic energy is the energy possessed by an object due to its motion. The equation takes into account the mass (m) of the object and its velocity (v). The factor of 1/2 is included to account for the relationship between the object's mass and velocity. Therefore, the correct answer is kinetic energy.Rate this question:
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- 8.
Current × Resistance
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Electric Field
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Magnetic Field
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Voltage drop
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None
Correct Answer
A. Voltage dropExplanation
Voltage drop is the correct answer because it is the term used to describe the decrease in electric potential across a component or circuit element. When current flows through a resistor, for example, there is a drop in voltage due to the resistance encountered. This drop in voltage is essential for the proper functioning of electrical circuits and can be calculated using Ohm's law.Rate this question:
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- 9.
Who were the founders of INTEL in 1968
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Thomson,Fleming,Lee de'Forest
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Shockley, Bardeen, Braittain
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Robert Noyce, Gordon Moore, A. Grove
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Faraday,Bell,Edison
Correct Answer
A. Robert Noyce, Gordon Moore, A. GroveExplanation
Robert Noyce, Gordon Moore, and A. Grove were the founders of INTEL in 1968. These individuals played a crucial role in the establishment of the company, which has since become a leading manufacturer of computer processors and other technology products. Noyce and Moore were both pioneers in the field of semiconductor technology, and their expertise and vision were instrumental in the early success of INTEL. A. Grove, who later became the company's CEO, also played a significant role in shaping the company's direction and growth. Together, these three founders laid the foundation for INTEL's success in the technology industry.Rate this question:
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- 10.
What is the number of electrodes in TRIODE
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2
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3
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4
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5
Correct Answer
A. 3Explanation
A triode is a type of vacuum tube that contains three electrodes - a cathode, an anode, and a control grid. The cathode emits electrons, the anode collects them, and the control grid regulates the flow of electrons. Therefore, the correct answer is 3.Rate this question:
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- 11.
What is the unit of resistance?
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Ohms
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Henry
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Farad
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Radians
Correct Answer
A. OhmsExplanation
The unit of resistance is Ohms. Ohms is the standard unit of electrical resistance in the International System of Units (SI). It is named after the German physicist Georg Simon Ohm, who formulated Ohm's law. Resistance is a measure of how much a material or device opposes the flow of electric current. It is represented by the symbol Ω (omega). Henry is the unit of inductance, Farad is the unit of capacitance, and Radians is the unit of angular measurement.Rate this question:
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- 12.
What is the unit of capacitance ?
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Ohms
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Henry
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Farad
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Radians
Correct Answer
A. FaradExplanation
The unit of capacitance is the Farad. The Farad is a unit of electrical capacitance, measuring the ability of a capacitor to store an electric charge. It is named after the English physicist Michael Faraday.Rate this question:
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- 13.
Mgh
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Kinetic energy
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Potential energy
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Thermal energy
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None
Correct Answer
A. Potential energyExplanation
The equation "mgh" represents the potential energy of an object. "m" represents the mass of the object, "g" represents the acceleration due to gravity, and "h" represents the height of the object above a reference point. Potential energy is the energy possessed by an object due to its position or condition, and it can be converted into other forms of energy. In this case, the equation indicates that the object has potential energy based on its mass and height.Rate this question:
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- 14.
What Statistics is followed by electron?
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Bose-Einstein
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Fermi-Dirac
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Gaussian
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None
Correct Answer
A. Fermi-DiracExplanation
Fermi-Dirac statistics is followed by electrons. This statistical model describes the behavior of particles with half-integer spin, such as electrons, in a system with many available energy levels. It determines the probability distribution of these particles occupying different energy levels, taking into account the Pauli exclusion principle, which states that no two identical fermions can occupy the same quantum state simultaneously. Therefore, electrons, being fermions, follow Fermi-Dirac statistics.Rate this question:
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- 15.
Relative permittivity of air is
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4
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3
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2
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1
Correct Answer
A. 1Explanation
The relative permittivity of air is 1. Relative permittivity, also known as dielectric constant, is a measure of a material's ability to store electrical energy in an electric field. Air has a relative permittivity of 1 because it has a very low ability to store electrical energy compared to other materials. This means that air is a poor electrical insulator and allows electric charges to move through it easily.Rate this question:
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- 16.
Electric Field is
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Positive potential grad
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Negative potential grad.
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Second derivative of potential
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None
Correct Answer
A. Negative potential grad.Explanation
The correct answer is "negative potential grad." This is because the electric field is defined as the negative gradient of the electric potential. The electric potential represents the amount of electric potential energy per unit charge at a given point in space. The negative sign indicates that the electric field points in the direction of decreasing potential, which is from higher potential to lower potential.Rate this question:
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- 17.
Who invented Telephone?
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Alexander Graham Bell
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John Ambrose Fleming
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De Lee Forest
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Thomas Alva Edison
Correct Answer
A. Alexander Graham BellExplanation
Alexander Graham Bell is credited with inventing the telephone. He was a Scottish-born scientist and inventor who patented his invention in 1876. Bell's invention revolutionized communication by allowing people to transmit sound over long distances. He is widely recognized as the inventor of the telephone and his contribution to the field of telecommunications is significant.Rate this question:
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- 18.
What is Third Information Revolution?
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Invention of Super Computer
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Invention of Computers
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Invention of Rotating Printing Press
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Invention of Alphabets
Correct Answer
A. Invention of ComputersExplanation
The third information revolution refers to the invention of computers. Computers have revolutionized the way information is processed, stored, and accessed. They have greatly enhanced communication, automation, and data analysis, leading to significant advancements in various fields such as science, technology, business, and education. Computers have become an integral part of our daily lives, transforming the way we work, communicate, and access information.Rate this question:
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- 19.
What is the polarity of Cathode
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Negative
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Positive
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Neutral
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Not applicable
Correct Answer
A. NegativeExplanation
The polarity of the cathode is negative because it is the electrode where electrons are received or reduction occurs in an electrochemical cell or device. The cathode attracts positively charged ions or cations and is connected to the negative terminal of a power source.Rate this question:
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- 20.
What is the charge of electron?
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1.6*10^-19
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=-1.6*10^-19
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0
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None
Correct Answer
A. =-1.6*10^-19Explanation
The charge of an electron is -1.6*10^-19. This value represents the fundamental unit of negative electric charge carried by an electron. The negative sign indicates that electrons have a negative charge, while protons, which have an equal but opposite charge, have a positive charge. The magnitude of the charge, 1.6*10^-19, is extremely small but plays a crucial role in determining the behavior of atoms and the interactions between particles in the field of electromagnetism.Rate this question:
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- 21.
What is the unit of current?
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Coulombs
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Coul/sec=Ampere
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Volt
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Ohms
Correct Answer
A. Coul/sec=AmpereExplanation
The unit of current is Ampere, which is represented by the symbol A. Ampere is defined as one coulomb of charge passing through a point in one second. Therefore, the correct answer is Coul/sec=Ampere.Rate this question:
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- 22.
Newton×Meter
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Joule
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Watt
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Derivative of Watt
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None
Correct Answer
A. JouleExplanation
The correct answer is Joule because Joule is the SI unit of energy and work, which is equal to the work done by a one newton force acting over a one-meter distance. Newton-meter is another unit of energy, but it is equivalent to Joule, so it is not a separate option. Watt is the SI unit of power, which is the rate at which work is done or energy is transferred. The derivative of Watt is not a valid unit of measurement in this context.Rate this question:
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- 23.
Q coulomb charge creates D(R) electric flux density
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Q/(R^2)
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Q/(4Ï€R^2)
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Q/(8Ï€R^2)
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Q/(16Ï€R^2)
Correct Answer
A. Q/(4Ï€R^2)Explanation
The electric flux density created by a coulomb charge is given by Q/(4Ï€R^2). This is because the electric flux density is inversely proportional to the square of the distance from the charge (R^2), and directly proportional to the magnitude of the charge (Q). The factor of 4Ï€ is included to account for the spherical nature of the electric field, as the flux density spreads out uniformly in all directions around the charge. Therefore, the correct answer is Q/(4Ï€R^2).Rate this question:
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- 24.
What atomic model did Thomson propose?
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Solar-System Model
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Plum-Pudding Model
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Bohr's Model
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None
Correct Answer
A. Plum-Pudding ModelExplanation
Thomson proposed the Plum-Pudding Model of the atom. In this model, the atom is compared to a plum pudding, with the positive charge spread uniformly throughout the atom and the negatively charged electrons embedded within it. This model suggested that the atom is composed of a positively charged substance with negatively charged electrons scattered within it, similar to the distribution of raisins in a plum pudding. However, later experiments led to the discovery of the nucleus and the development of new atomic models.Rate this question:
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- 25.
Who invented Incandescent Lamp?
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J. J. Thomson
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John Ambrose Fleming
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De Lee Forest
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Thomas Alva Edison
Correct Answer
A. Thomas Alva EdisonExplanation
Thomas Alva Edison is the correct answer because he is widely recognized as the inventor of the incandescent lamp. Edison's contribution to the development of the light bulb was significant, as he successfully created a practical and commercially viable version of the lamp. His invention revolutionized the way we illuminate our homes and has had a lasting impact on society.Rate this question:
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- 26.
Who were the inventors of Bipolar Junction Transistor?
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Faraday,Bell,Edison
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Thomson,Fleming,Lee de'Forest
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Shockley,Bardeen,Braittain
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Robert Noyce,Jack Kilby
Correct Answer
A. Shockley,Bardeen,BraittainExplanation
The correct answer is Shockley, Bardeen, Braittain. Shockley, Bardeen, and Braittain are the inventors of the Bipolar Junction Transistor. They developed the transistor at Bell Labs in the late 1940s and their invention revolutionized the field of electronics. The transistor is a fundamental component of modern electronic devices and is widely used in various applications such as amplification and switching. Robert Noyce and Jack Kilby are known for their contributions to the development of the integrated circuit, not the bipolar junction transistor.Rate this question:
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- 27.
Who were the inventors of Integrated Circuits?
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Faraday,Bell,Edison
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Thomson,Fleming,Lee de'Forest
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Shockley,Bardeen,Braittain
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Robert Noyce,Jack Kilby
Correct Answer
A. Robert Noyce,Jack KilbyExplanation
Robert Noyce and Jack Kilby are credited as the inventors of integrated circuits. Noyce, along with his team at Fairchild Semiconductor, developed the first practical integrated circuit in 1959. This circuit combined multiple electronic components onto a single silicon chip, revolutionizing the field of electronics. Kilby, working independently at Texas Instruments, also developed a similar integrated circuit around the same time. Both of their contributions were significant in paving the way for the miniaturization and increased functionality of electronic devices that we see today.Rate this question:
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- 28.
What is Internet ?
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Local area Network of computers
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Metropolitan Area Network
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World Wide Network of computers
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Wide Area Network
Correct Answer
A. World Wide Network of computersExplanation
The correct answer is "World Wide Network of computers." This option accurately describes the internet as a global network that connects computers and devices from all around the world. It allows for the exchange of information, communication, and access to various resources and services.Rate this question:
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- 29.
What is the function of Cathode in VT?
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No function
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To emit electrons
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To capture electrons
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To suppress electrons
Correct Answer
A. To emit electronsExplanation
The function of the cathode in a vacuum tube (VT) is to emit electrons. The cathode is heated, causing it to release electrons through a process called thermionic emission. These emitted electrons are then attracted towards the anode, creating a flow of current within the vacuum tube. Therefore, the cathode plays a crucial role in the operation of a VT by generating the electron flow necessary for its functioning.Rate this question:
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- 30.
What is the number of electrodes in Pentode
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5
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4
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3
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2
Correct Answer
A. 5Explanation
A pentode is a type of vacuum tube that consists of five electrodes. These electrodes are the cathode, control grid, screen grid, suppressor grid, and plate. Each electrode serves a specific function in the amplification and control of the electron flow within the tube. Therefore, the correct answer is 5.Rate this question:
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- 31.
When 1 Coulomb of Charge falls through 1V
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0.1J gained
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1J gained
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10J gained
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100J gained
Correct Answer
A. 1J gainedExplanation
When 1 Coulomb of charge falls through 1V, 1J of energy is gained. This is because the energy gained or lost by a charged particle can be calculated using the equation E = QV, where E is the energy, Q is the charge, and V is the potential difference. In this case, the charge is 1 Coulomb and the potential difference is 1V, so the energy gained is 1J.Rate this question:
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- 32.
When did Vacuum Tube Era start ?
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1903
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1949
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1959
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1971
Correct Answer
A. 1903Explanation
The Vacuum Tube Era started in 1903. This era refers to the period when vacuum tubes were widely used in electronic devices such as radios, televisions, and early computers. Vacuum tubes were crucial components in these devices as they allowed for the amplification and control of electrical signals. The invention and development of vacuum tubes revolutionized the field of electronics and paved the way for the advancement of technology in the early 20th century.Rate this question:
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- 33.
What is the role of Amplifiers in long distance telephone call?
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Removes Freq.Ditortion
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Removes Phase distortion
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Boosts the weak signal
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None
Correct Answer
A. Boosts the weak signalExplanation
Amplifiers play a crucial role in long distance telephone calls by boosting the weak signal. As the signal travels over long distances, it tends to weaken and lose strength. Amplifiers are used to increase the amplitude of the signal, making it stronger and ensuring that it can reach its destination with sufficient strength for clear communication. Amplifiers do not remove frequency distortion or phase distortion, and the answer "none" is not applicable in this context.Rate this question:
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- 34.
What is the polarity of Anode
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Negative
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Positive
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Neutral
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Not applicable
Correct Answer
A. PositiveExplanation
The anode is the positively charged electrode in an electrochemical cell or device. It attracts the negatively charged ions or electrons and is where oxidation occurs. Therefore, the correct answer is positive.Rate this question:
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- 35.
What is the number of electrodes in TETRODE
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2
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3
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4
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5
Correct Answer
A. 4Explanation
A tetrode is a type of vacuum tube that contains four electrodes: a cathode, a control grid, a screen grid, and a plate. These electrodes are used to control the flow of electrons within the tube and amplify electrical signals. Therefore, the correct answer is 4.Rate this question:
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- 36.
I (moment of inertia)×ω(radians/sec)
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Energy
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P(linear momentum)
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J(angular momentum)
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None
Correct Answer
A. J(angular momentum)Explanation
Angular momentum (J) is the correct answer because it is the product of moment of inertia (I) and angular velocity (ω). Angular momentum is a vector quantity that represents the rotational motion of an object. It depends on the distribution of mass around an axis of rotation (moment of inertia) and how fast the object is rotating (angular velocity). The formula for angular momentum is J = Iω. Linear momentum (p) and energy are not directly related to the product of moment of inertia and angular velocity.Rate this question:
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- 37.
Moment of Inertia×Angular Acceleration=
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Linear force
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Torque=Rotational Force
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Angular velocity
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None
Correct Answer
A. Torque=Rotational ForceExplanation
The equation Moment of Inertia multiplied by Angular Acceleration equals Torque. Torque is the rotational force applied to an object, causing it to rotate around an axis. The Moment of Inertia represents an object's resistance to changes in its rotational motion. Angular Acceleration measures how quickly an object's angular velocity changes over time. Therefore, Torque is directly related to the Moment of Inertia and Angular Acceleration, making it the correct answer.Rate this question:
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- 38.
What is the fifth electrode in a PENTODE
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Cathode
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Grid
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Screen
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Suppressor
Correct Answer
A. SuppressorExplanation
The fifth electrode in a pentode is called the suppressor. The suppressor electrode is located between the screen grid and the anode. Its main function is to prevent secondary emission of electrons from the anode back towards the screen grid. By suppressing these secondary emissions, the suppressor electrode helps to improve the overall performance and efficiency of the pentode amplifier.Rate this question:
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- 39.
In 1977 complete stand-alone Personal Computer was marketed. What are the models?
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PDP1
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Apple II, IBM 5100
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PDP8
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UNIVACII
Correct Answer
A. Apple II, IBM 5100Explanation
In 1977, the complete stand-alone Personal Computer was marketed, and two models that were available at that time were the Apple II and IBM 5100. These models were significant in the history of personal computers as they were among the first commercially successful PCs. The Apple II, developed by Apple Inc., was a highly influential model that featured color graphics and an open architecture, making it popular among home users and businesses. The IBM 5100, developed by IBM, was a portable computer that offered advanced features such as a built-in display and keyboard. These models played a crucial role in shaping the future of personal computing.Rate this question:
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- 40.
B magnetic flux density is equal to
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εE
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µH
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µε
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None
Correct Answer
A. µHExplanation
The correct answer is µH. In electromagnetism, magnetic flux density (B) is related to the magnetic field strength (H) by the permeability of the medium (µ). This relationship is given by B = µH. Therefore, the correct answer is µH as it represents the correct equation relating magnetic flux density to magnetic field strength.Rate this question:
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- 41.
(1/2)I×ω^2
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Linear kinetic energy
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Rotational Kinetic Energy
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Potential energy
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None
Correct Answer
A. Rotational Kinetic EnergyExplanation
The given expression, I×ω^2, represents the rotational kinetic energy. This is because I represents the moment of inertia, which is a measure of an object's resistance to rotational motion, and ω represents the angular velocity, which is the rate at which an object rotates. When these two values are multiplied and squared, it gives the rotational kinetic energy of the object. Therefore, the correct answer is rotational kinetic energy.Rate this question:
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- 42.
What is First Information Revolution?
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Invention of Super Computer
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Invention of Computers
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Invention of Rotating Printing Press
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Invention of Alphabets
Correct Answer
A. Invention of AlphabetsExplanation
The First Information Revolution refers to the invention of alphabets. Alphabets revolutionized communication by providing a written form of language, allowing information to be recorded, transmitted, and preserved over time. This invention laid the foundation for the development of written literature, education, and the dissemination of knowledge. Alphabets enabled humans to communicate complex ideas, share information across distances, and document historical events, leading to significant advancements in human civilization.Rate this question:
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- 43.
In 2004, who discovered Graphene
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Faraday,Bell,Edison
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Thomson,Fleming,Lee de'Forest
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Shockley,Bardeen,Braittain
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Andre K. Geim and K.S. Novoselov,
Correct Answer
A. Andre K. Geim and K.S. Novoselov,Explanation
Andre K. Geim and K.S. Novoselov discovered Graphene in 2004.Rate this question:
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- 44.
What is the function of Anode in VT?
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No function
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To emit electrons
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To capture electrons
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To suppress electrons
Correct Answer
A. To capture electronsExplanation
The function of the anode in VT (vacuum tubes) is to capture electrons. In a vacuum tube, the anode is a positively charged electrode that attracts and collects the electrons emitted by the cathode. This process allows for the flow of current and the amplification of signals in electronic devices such as radios and televisions.Rate this question:
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- 45.
1V into 1 Amp is equal to
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1 Joule
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1 Joule/s=1W
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10W
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100W
Correct Answer
A. 1 Joule/s=1WExplanation
The correct answer is 1 Joule/s=1W because the unit of power is defined as the rate at which work is done or energy is transferred. 1 Volt multiplied by 1 Ampere gives us 1 Watt, which is equivalent to 1 Joule per second.Rate this question:
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- 46.
1Coulomb is subjected to 1V/m electric field
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10 N Force developed
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1 N force developed
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(1/10)N developed
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100N developed
Correct Answer
A. 1 N force developedExplanation
The given information states that 1 Coulomb is subjected to a 1V/m electric field. According to the formula F = qE, where F is the force, q is the charge, and E is the electric field strength, we can calculate the force developed. Since the charge is 1 Coulomb and the electric field strength is 1V/m, the force developed would be 1 N. Therefore, the correct answer is 1 N force developed.Rate this question:
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- 47.
Potential Drop
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Integral of E
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First derivative of E
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Second derivative of E
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None
Correct Answer
A. Integral of EExplanation
The correct answer is "Integral of E" because the integral of a function represents the area under the curve of that function. In this context, "E" likely represents an electric field, and taking the integral of the electric field would give the potential drop, which is a measure of the change in electric potential between two points.Rate this question:
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- 48.
What is the material in Cathode?
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Tungsten
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Copper
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Strontium Barium CuO
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Aluminum
Correct Answer
A. Strontium Barium CuOExplanation
The material in the cathode is Strontium Barium CuO. This is because the cathode is typically made of a material that can emit electrons when heated, and Strontium Barium CuO is known to have good electron emission properties. Tungsten is commonly used in cathodes, but it is not listed as an option. Copper and Aluminum are not suitable materials for cathodes as they do not have the necessary electron emission properties.Rate this question:
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- 49.
When was Integrated Circuit invented?
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1903
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1949
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1959
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1971
Correct Answer
A. 1959Explanation
The correct answer is 1959. This is the year when the integrated circuit was invented. Integrated circuits, also known as microchips, are small electronic devices that contain multiple components such as transistors, resistors, and capacitors on a single chip of semiconductor material. The invention of the integrated circuit revolutionized the field of electronics by making it possible to pack more components into a smaller space, leading to the development of smaller and more powerful electronic devices.Rate this question:
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