Electronics & Communication Quiz - 1

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  • 1/113 Questions

    What is the unit of current?

    • Coulombs
    • Coul/sec=Ampere
    • Volt
    • Ohms
Please wait...
About This Quiz

This is a very elementary Quiz containing questions from Solid State Devices, Basic Electronics, etc

Electronics & Communication Quiz - 1 - Quiz

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  • 2. 

    What is the unit of Inductor ?

    • Ohms

    • Henry

    • Farad

    • Radians

    Correct Answer
    A. Henry
    Explanation
    The unit of an inductor is Henry. Henry is the SI unit of inductance, named after Joseph Henry, an American scientist. Inductance is a property of an electrical circuit that opposes changes in current flow. It is measured in Henry and represents the ratio of the induced electromotive force to the rate of change of current. Ohms is the unit of electrical resistance, Farad is the unit of capacitance, and Radians is the unit of angular measurement.

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  • 3. 

    What is the unit of capacitance ?

    • Ohms

    • Henry

    • Farad

    • Radians

    Correct Answer
    A. Farad
    Explanation
    The unit of capacitance is the farad. Capacitance is a measure of an object's ability to store electrical charge. The farad is a unit of measurement for capacitance and is defined as one coulomb of charge per volt of potential difference. It is named after the English physicist Michael Faraday.

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  • 4. 

    What is the unit of energy ?

    • Watt

    • Joules

    • V/m

    • C/m^2

    Correct Answer
    A. Joules
    Explanation
    Joules is the correct answer because it is the standard unit of energy in the International System of Units (SI). Energy is defined as the capacity to do work or produce heat, and joules measure the amount of energy transferred or converted. Watts, V/m, and C/m^2 are not units of energy, but rather units of power, electric field intensity, and electric charge density, respectively.

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  • 5. 

    What is the unit of resistance?

    • Ohms

    • Henry

    • Farad

    • Radians

    Correct Answer
    A. Ohms
    Explanation
    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 the measure of how much a material or device opposes the flow of electric current. It is represented by the symbol Ω. Henry is the unit of inductance, Farad is the unit of capacitance, and Radians is the unit of angular measurement.

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  • 6. 

    Value of µo is 

    • 1H/m

    • 2H/m

    • 4π×10^-7 H/m

    • 5H/m

    Correct Answer
    A. 4π×10^-7 H/m
    Explanation
    The value of µo, also known as the permeability of free space, is 4π×10^-7 H/m. This value represents the ability of a material to allow magnetic fields to pass through it. It is a fundamental constant in physics and is used in various calculations involving electromagnetism.

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  • 7. 

    Who invented Telephone?

    • Alexander Graham Bell

    • John Ambrose Fleming

    • De Lee Forest

    • Thomas Alva Edison

    Correct Answer
    A. Alexander Graham Bell
    Explanation
    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 telephone revolutionized communication by allowing people to talk to each other over long distances. His invention laid the foundation for the development of the modern telephone system and had a profound impact on society, transforming the way people communicate.

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  • 8. 

    Who discovered Electron?

    • Thomas Alva Edison

    • Michael Faraday

    • Alexander G. Bell

    • J. J. Thomson

    Correct Answer
    A. J. J. Thomson
    Explanation
    J. J. Thomson is credited with the discovery of the electron. In 1897, he conducted experiments using cathode rays and discovered that they were composed of negatively charged particles, which he called electrons. This discovery revolutionized the understanding of atomic structure and laid the foundation for the development of modern physics. Thomas Alva Edison, Michael Faraday, and Alexander G. Bell made significant contributions in their respective fields, but they were not the ones who discovered the electron.

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  • 9. 

    What Statistics is followed by electron?

    • Bose-Einstein

    • Fermi-Dirac

    • Gaussian

    • None

    Correct Answer
    A. Fermi-Dirac
    Explanation
    Fermi-Dirac statistics is followed by electrons. This statistical distribution describes the behavior of particles with half-integer spin, such as electrons, under the laws of quantum mechanics. It determines the probability of finding electrons in different energy states within a system, taking into account the Pauli exclusion principle, which states that no two electrons can occupy the same quantum state simultaneously. This statistical model is essential in understanding the behavior of electrons in various physical systems, such as metals and semiconductors.

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  • 10. 

    Relative permittivity of air is 

    • 4

    • 3

    • 2

    • 1

    Correct Answer
    A. 1
    Explanation
    The relative permittivity of air is 1. Relative permittivity, also known as dielectric constant, is a measure of how well a material can store electrical energy in an electric field. Air has a relative permittivity of 1 because it is a non-polar substance with no permanent electric dipole moment. This means that air does not have the ability to store electrical energy efficiently compared to other materials.

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  • 11. 

    (1/2)mv^2

    • Kinetic energy

    • Potential energy

    • Thermal energy

    • None

    Correct Answer
    A. Kinetic energy
    Explanation
    The equation (1/2)mv^2 represents the formula for kinetic energy, which is the energy possessed by an object due to its motion. The variables m and v represent the mass and velocity of the object, respectively. Therefore, the correct answer is kinetic energy.

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  • 12. 

    Current × Resistance

    • Electric Field

    • Magnetic Field

    • Voltage drop

    • None

    Correct Answer
    A. Voltage drop
    Explanation
    Voltage drop refers to the decrease in electric potential across a component or circuit due to the resistance encountered by the current flowing through it. It is a result of Ohm's law, which states that the voltage drop across a resistor is directly proportional to the current flowing through it and the resistance of the resistor. Therefore, when current flows through a resistor, a voltage drop occurs across it.

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  • 13. 

    Mgh

    • Kinetic energy

    • Potential energy

    • Thermal energy

    • None

    Correct Answer
    A. Potential energy
    Explanation
    The given answer, potential energy, is correct because "mgh" represents the formula for gravitational potential energy. "m" refers to the mass of an object, "g" represents the acceleration due to gravity, and "h" indicates the height of the object. When an object is lifted against gravity, work is done on it and it gains potential energy. Therefore, potential energy is the most appropriate choice among the given options.

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  • 14. 

    What is the polarity of Cathode

    • Negative

    • Positive

    • Neutral

    • Not applicable

    Correct Answer
    A. Negative
    Explanation
    The polarity of the cathode is negative because in an electrical circuit, the cathode is the electrode where electrons flow out of. Electrons are negatively charged particles, so when they flow out of the cathode, it gives the cathode a negative polarity.

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  • 15. 

    µo is 

    • Absolute permittivity

    • Absolute permeability

    • Absolute reluctance

    • None

    Correct Answer
    A. Absolute permeability
    Explanation
    The correct answer is "absolute permeability." This refers to the measure of a material's ability to allow the flow of magnetic flux. It is a property of the material and is denoted by the symbol µo. It is a fundamental constant in electromagnetism and is used in calculations involving magnetic fields and induction. Absolute permeability is different for different materials and is often measured in henries per meter (H/m).

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  • 16. 

    What is 1 eV of energy?

    • 1Joules

    • 0.1Joules

    • 0.001Joules

    • 1.6*10^-19Joules

    Correct Answer
    A. 1.6*10^-19Joules
    Explanation
    1 eV of energy is equal to 1.6*10^-19 Joules. The electron volt (eV) is a unit of energy commonly used in physics and chemistry to describe the energy of subatomic particles. It is defined as the amount of energy gained or lost by an electron when it moves through an electric potential difference of one volt. The conversion factor between eV and Joules is 1 eV = 1.6*10^-19 Joules. Therefore, the correct answer is 1.6*10^-19 Joules.

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  • 17. 

    B magnetic flux density is equal to 

    • εE

    • µH

    • µε

    • None

    Correct Answer
    A. µH
    Explanation
    The correct answer is µH. This is because magnetic flux density (B) is equal to the product of the permeability of the medium (µ) and the magnetic field strength (H). Therefore, B = µH.

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  • 18. 

    Relative permeability of air is 

    • 1

    • 2

    • 3

    • 4

    Correct Answer
    A. 1
    Explanation
    The relative permeability of air is 1 because air is considered to be a non-magnetic material. Relative permeability is a measure of how easily a material can be magnetized in the presence of a magnetic field compared to a vacuum. Since air does not possess magnetic properties, it cannot be easily magnetized and therefore has a relative permeability of 1.

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  • 19. 

    Who invented Incandescent Lamp?

    • J. J. Thomson

    • John Ambrose Fleming

    • De Lee Forest

    • Thomas Alva Edison

    Correct Answer
    A. Thomas Alva Edison
    Explanation
    Thomas Alva Edison is the correct answer because he is widely credited with inventing the incandescent lamp. Edison's version of the incandescent lamp, known as the Edison bulb, was the first practical and commercially successful electric light bulb. He developed a carbon filament that could glow for extended periods of time, leading to the widespread adoption of electric lighting. Edison's invention revolutionized the way we illuminate our homes and paved the way for the modern lighting industry.

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  • 20. 

    What is Third Information Revolution?

    • Invention of Super Computer

    • Invention of Computers

    • Invention of Rotating Printing Press

    • Invention of Alphabets

    Correct Answer
    A. Invention of Computers
    Explanation
    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, data analysis, and automation in various industries and sectors. The invention of computers has paved the way for advancements in technology, such as the internet, artificial intelligence, and big data, leading to significant changes in society and the economy.

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  • 21. 

    (1/2)I×ω^2

    • Linear kinetic energy

    • Rotational Kinetic Energy

    • Potential energy

    • None

    Correct Answer
    A. Rotational Kinetic Energy
    Explanation
    The given expression, I×ω^2, represents the rotational kinetic energy. The variable I represents the moment of inertia, which is a measure of an object's resistance to rotational motion. The variable ω represents the angular velocity, which is the rate at which an object rotates. When these two values are multiplied and squared, it gives us the rotational kinetic energy, which is the energy associated with the object's rotational motion.

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  • 22. 

    What was the first online-utility service in the world?

    • Online railway reservation in India

    • Online banking

    • French MINITEL system

    • None of these

    Correct Answer
    A. French MINITEL system
    Explanation
    The correct answer is the French MINITEL system. The MINITEL system was launched in France in 1982 and was the world's first online-utility service. It provided users with a wide range of services such as online banking, shopping, information retrieval, and email. The system was widely used in France until it was discontinued in 2012.

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  • 23. 

    What is Internet ?

    • Local area Network of computers

    • Metropolitan Area Network

    • World Wide Network of computers

    • Wide Area Network

    Correct Answer
    A. World Wide Network of computers
    Explanation
    The correct answer is "World Wide Network of computers". This answer accurately describes the internet as a global network that connects millions of computers and devices worldwide. It allows for the exchange of information, communication, and access to various online services and resources.

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  • 24. 

    What is the polarity of Anode

    • Negative

    • Positive

    • Neutral

    • Not applicable

    Correct Answer
    A. Positive
    Explanation
    The anode is the positively charged electrode in an electrical circuit. It attracts negatively charged particles, such as electrons, and facilitates the flow of current. Therefore, the correct answer is positive.

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  • 25. 

    What is the number of electrodes in TRIODE

    • 2

    • 3

    • 4

    • 5

    Correct Answer
    A. 3
    Explanation
    The number of electrodes in a TRIODE is 3. A TRIODE is a type of vacuum tube that consists of three electrodes: a cathode, a control grid, and a plate. The cathode emits electrons, the control grid controls the flow of electrons, and the plate collects the electrons. These three electrodes work together to amplify or control electrical signals.

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  • 26. 

    What is the Work Function of StBaCuO?

    • 0.5eV

    • 1eV

    • 2eV

    • 3eV

    Correct Answer
    A. 1eV
    Explanation
    The work function of a material is the amount of energy required to remove an electron from the material's surface. In this case, the work function of StBaCuO is 1eV, meaning that it takes 1 electron volt of energy to remove an electron from the surface of StBaCuO.

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  • 27. 

    Who were the founders of INTEL in 1968

    • Thomson,Fleming,Lee de'Forest

    • Shockley, Bardeen, Braittain

    • Robert Noyce, Gordon Moore, A. Grove

    • Faraday,Bell,Edison

    Correct Answer
    A. Robert Noyce, Gordon Moore, A. Grove
    Explanation
    Robert Noyce, Gordon Moore, and A. Grove were the founders of INTEL in 1968. These individuals played a crucial role in establishing the company and shaping its future. Noyce, known as the "Mayor of Silicon Valley," was a co-inventor of the integrated circuit and had a vision for the potential of microprocessors. Moore, who later formulated Moore's Law, provided strategic leadership and helped INTEL become a dominant force in the semiconductor industry. A. Grove, the company's first president, contributed to its early success and growth. Together, these founders laid the foundation for INTEL's innovation and technological advancements.

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  • 28. 

    When was Integrated Circuit invented?

    • 1903

    • 1949

    • 1959

    • 1971

    Correct Answer
    A. 1959
    Explanation
    The correct answer is 1959. This is the year when the integrated circuit was invented. The integrated circuit, also known as a microchip, is a crucial component in modern electronics. It revolutionized the field of electronics by enabling the miniaturization of electronic devices and increasing their performance. The invention of the integrated circuit paved the way for the development of computers, smartphones, and numerous other electronic devices that we use today.

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  • 29. 

    In 1977 complete stand-alone Personal Computer was marketed. What are the models?

    • PDP1

    • Apple II, IBM 5100

    • PDP8

    • UNIVACII

    Correct Answer
    A. Apple II, IBM 5100
    Explanation
    In 1977, the Apple II and IBM 5100 were marketed as complete stand-alone personal computers. These models were among the first to be widely available to the general public and played a significant role in popularizing personal computing. The PDP1, PDP8, and UNIVAC II were not complete stand-alone personal computers marketed in 1977, making them incorrect choices.

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  • 30. 

    What is the function of filament in a VT?

    • No function

    • To cause thermionic emission

    • To cause photo-ionic emission

    • To cause high field emission

    Correct Answer
    A. To cause thermionic emission
    Explanation
    The function of the filament in a VT (vacuum tube) is to cause thermionic emission. Thermionic emission is the process by which electrons are emitted from a heated filament, creating a flow of current in the vacuum tube. The filament acts as a source of heat, causing the electrons to gain enough energy to overcome the work function and escape from the surface of the filament. This emission of electrons is essential for the operation of the vacuum tube.

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  • 31. 

    When 1 Coulomb of Charge falls through 1V

    • 0.1J gained

    • 1J gained

    • 10J gained

    • 100J gained

    Correct Answer
    A. 1J gained
    Explanation
    When 1 Coulomb of charge falls through 1V, 1J of energy is gained. This is because the energy gained or lost by a charge can be calculated using the formula E = qV, where E is the energy, q is the charge, and V is the voltage. In this case, the charge is 1 Coulomb and the voltage is 1V, so the energy gained is 1J.

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  • 32. 

    Newton×Meter

    • Joule

    • Watt

    • Derivative of Watt

    • None

    Correct Answer
    A. Joule
    Explanation
    The correct answer is Joule. Joule is a unit of energy in the International System of Units (SI), equal to the work done by a one newton force acting over a one meter distance. It is commonly used to measure energy and work. In this context, Newton×Meter is another way of expressing Joule, as it represents a force of one newton applied over a distance of one meter. Therefore, the answer is Joule.

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  • 33. 

    Moment of Inertia×Angular Acceleration=

    • Linear force

    • Torque=Rotational Force

    • Angular velocity

    • None

    Correct Answer
    A. Torque=Rotational Force
    Explanation
    The equation Moment of Inertia × Angular Acceleration = Torque represents the relationship between the moment of inertia, angular acceleration, and torque in rotational motion. Torque is the rotational force that causes an object to rotate around an axis, and it is directly proportional to the product of the moment of inertia and angular acceleration. Therefore, the given answer correctly identifies that torque is equal to rotational force in this equation.

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  • 34. 

    What atomic model did Thomson propose?

    • Solar-System Model

    • Plum-Pudding Model

    • Bohr's Model

    • None

    Correct Answer
    A. Plum-Pudding Model
    Explanation
    Thomson proposed the Plum-Pudding Model of the atom. This model suggests that the atom is composed of a positively charged "pudding" with negatively charged electrons embedded within it, resembling plums in a pudding. This model was proposed in 1904 and was later disproven by the experiments of Rutherford, leading to the development of the nuclear model of the atom.

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  • 35. 

    What is the fifth electrode in a PENTODE

    • Cathode

    • Grid

    • Screen

    • Suppressor

    Correct Answer
    A. Suppressor
    Explanation
    The fifth electrode in a pentode is called the suppressor. The suppressor electrode is placed between the screen grid and the anode, and its purpose is to prevent secondary emission of electrons from the anode. It acts as a barrier to stop these electrons from reaching the screen grid and causing distortion or other issues in the amplifier circuit. The suppressor helps to improve the overall performance and efficiency of the pentode by maintaining a stable electron flow.

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  • 36. 

    What is the function of Cathode in VT?

    • No function

    • To emit electrons

    • To capture electrons

    • To suppress electrons

    Correct Answer
    A. To emit electrons
    Explanation
    The function of the cathode in a vacuum tube (VT) is to emit electrons. The cathode is a heated element that releases electrons through a process called thermionic emission. These emitted electrons then flow towards the anode, creating an electric current within the vacuum tube.

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  • 37. 

    Q coulomb charge creates D(R) electric flux density

    • Q/(R^2)

    • Q/(4Ï€R^2)

    • Q/(8Ï€R^2)

    • Q/(16Ï€R^2)

    Correct Answer
    A. Q/(4Ï€R^2)
    Explanation
    The electric flux density created by a coulomb charge is inversely proportional to the square of the distance from the charge. This is represented by the formula Q/(4Ï€R^2), where Q is the charge and R is the distance. As the distance increases, the electric flux density decreases. The factor of 4Ï€ in the denominator is derived from the formula for the surface area of a sphere, which represents the spreading out of the flux over the surface area. Therefore, the correct answer is Q/(4Ï€R^2).

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  • 38. 

    When did Solid State Era start?

    • 1903

    • 1949

    • 1959

    • 1971

    Correct Answer
    A. 1949
    Explanation
    The Solid State Era started in 1949. This is because in that year, the first practical point-contact transistor was invented by John Bardeen and Walter Brattain at Bell Laboratories. This invention marked a significant milestone in the development of solid-state electronics, as transistors replaced vacuum tubes and became the building blocks of modern electronic devices.

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  • 39. 

    Who were the inventors of Bipolar Junction Transistor?

    • Faraday,Bell,Edison

    • Thomson,Fleming,Lee de'Forest

    • Shockley,Bardeen,Braittain

    • Robert Noyce,Jack Kilby

    Correct Answer
    A. Shockley,Bardeen,Braittain
    Explanation
    The inventors of the Bipolar Junction Transistor were Shockley, Bardeen, and Brattain. This invention revolutionized the field of electronics and paved the way for the development of modern transistors. These three scientists jointly received the Nobel Prize in Physics in 1956 for their groundbreaking work on the transistor.

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  • 40. 

    1V into 1 Amp is equal to 

    • 1 Joule

    • 1 Joule/s=1W

    • 10W

    • 100W

    Correct Answer
    A. 1 Joule/s=1W
    Explanation
    The unit of power is watt (W), which is defined as the rate at which work is done or energy is transferred. One joule per second (J/s) is equal to one watt (W). Therefore, 1V (volt) into 1 Amp (ampere) is equal to 1 watt (W).

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  • 41. 

    1Coulomb is subjected to 1V/m electric field

    • 10 N Force developed

    • 1 N force developed

    • (1/10)N developed

    • 100N developed

    Correct Answer
    A. 1 N force developed
    Explanation
    The given information states that 1 Coulomb is subjected to a 1V/m electric field. According to Coulomb's law, the force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. Since the electric field strength is given as 1V/m, we can infer that the force developed is 1 Newton (N).

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  • 42. 

    Torque×angle

    • Watt

    • Angular acceleration

    • Rotational energy

    • None

    Correct Answer
    A. Rotational energy
    Explanation
    Rotational energy refers to the energy possessed by an object due to its rotation. It is dependent on both torque and angle. Torque is the force that causes an object to rotate, while angle represents the distance through which the object rotates. The product of torque and angle determines the amount of rotational energy. Therefore, rotational energy is the correct answer as it encompasses both torque and angle in the context of rotational motion.

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  • 43. 

    What is Second Information Revolution?

    • Invention of Super Computer

    • Invention of Computers

    • Invention of Rotating Printing Press

    • Invention of Alphabets

    Correct Answer
    A. Invention of Rotating Printing Press
    Explanation
    The Second Information Revolution refers to the invention of the rotating printing press. This innovation, credited to German printer Johannes Gutenberg in the 15th century, revolutionized the dissemination of information by making it faster and more accessible. The rotating printing press allowed for the mass production of books and other printed materials, leading to a significant increase in literacy rates and the spread of knowledge. This invention laid the foundation for the modern printing industry and paved the way for the democratization of information.

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  • 44. 

    Medium Scale Integrated Circuit Chip is….

    • Less than 30:RTL Chip

    • 30 to 100 components:Magnitude Comparator Chip

    • >100,000components:μP4004

    • >1 million components:Pentium IV

    Correct Answer
    A. 30 to 100 components:Magnitude Comparator Chip
    Explanation
    A Medium Scale Integrated Circuit Chip refers to a chip that contains a moderate number of components. In this context, a chip with 30 to 100 components is classified as a Magnitude Comparator Chip. This type of chip is designed to compare the relative magnitudes of two binary numbers. It is used in digital systems to determine if one number is greater than, equal to, or less than another number.

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  • 45. 

    In 2004, who discovered Graphene

    • Faraday,Bell,Edison

    • Thomson,Fleming,Lee de'Forest

    • Shockley,Bardeen,Braittain

    • Andre K. Geim and K.S. Novoselov,

    Correct Answer
    A. Andre K. Geim and K.S. Novoselov,
    Explanation
    In 2004, Andre K. Geim and K.S. Novoselov discovered Graphene.

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  • 46. 

    What is the number of electrodes in Pentode

    • 5

    • 4

    • 3

    • 2

    Correct Answer
    A. 5
    Explanation
    A pentode is a type of vacuum tube that has five electrodes. These electrodes are the cathode, control grid, screen grid, suppressor grid, and plate. Each electrode plays a specific role in the amplification and control of the electron flow within the tube. Therefore, the correct answer is 5.

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  • 47. 

    D electric flux density is equal to 

    • εE

    • µH

    • µε

    • None

    Correct Answer
    A. εE
    Explanation
    The correct answer is εE because electric flux density (D) is defined as the amount of electric flux passing through a given area per unit area. It is directly proportional to the electric field (E) and the proportionality constant is ε, which represents the permittivity of the medium. Therefore, D = εE.

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  • 48. 

    Electric Field is 

    • Positive potential grad

    • Negative potential grad.

    • Second derivative of potential

    • 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 describes the amount of electric potential energy per unit charge at a given point in space. The negative sign in front of the gradient indicates that the electric field points in the direction of decreasing potential. Therefore, the electric field is in the opposite direction of the potential gradient and is considered negative.

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  • 49. 

    I (moment of inertia)×ω(radians/sec)

    • Energy

    • P(linear momentum)

    • J(angular momentum)

    • None

    Correct Answer
    A. J(angular momentum)
    Explanation
    The equation I * ω represents the rotational kinetic energy of an object, where I is the moment of inertia and ω is the angular velocity in radians per second. The equation p represents linear momentum, which is the product of an object's mass and its linear velocity. The equation J represents angular momentum, which is the product of an object's moment of inertia and its angular velocity. Therefore, the correct answer is J, as it represents angular momentum.

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  • Mar 16, 2023
    Quiz Edited by
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  • Nov 24, 2013
    Quiz Created by
    Sohailalam2

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