Online Physics Quiz 2020 For B. Sc. Sem VI Organized By Department Of Physics, Kamla Nehru MahaVIdyalaya, Nagpur
B. Sc. Sem VI
Instructions: The Quiz is based on the R. T. M. Nagpur University Syllabus of B. Sc. (Physics). The Quiz consist of total 50 questions. Question no. 1 to 25 based on Physics paper I and Question no. 26 to 50 based on Physics Paper II. All Questions are Compulsory. No negative marking Has a time limit of 120 minutes Has a pass mark of 40% You can download certificate after finishing the quiz.
Questions and Answers
- 1.
A frame of reference has four coordinates, x, y, z, and t is referred to as the_____________
- A.
Inertial frame of reference
- B.
Non-inertial frame of reference
- C.
Space-time reference
- D.
Four-dimensional plane
Correct Answer
C. Space-time referenceExplanation
The term "space-time reference" refers to a frame of reference that includes both spatial coordinates (x, y, z) and time (t). This concept is a fundamental aspect of Einstein's theory of relativity, which states that space and time are interconnected and should be considered together as a four-dimensional continuum. In a space-time reference frame, the position and motion of objects can be described using all four coordinates, allowing for a more complete understanding of their behavior in relation to each other.Rate this question:
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- 2.
According to Einstein’s Special Theory of Relativity, laws of physics can be formulated based on ____________
- A.
Inertial Frame of Reference
- B.
Non-Inertial Frame of Reference
- C.
Both Inertial and Non-Inertial Frame of Reference
- D.
Quantum State
Correct Answer
A. Inertial Frame of ReferenceExplanation
According to Einstein's Special Theory of Relativity, laws of physics can be formulated based on the Inertial Frame of Reference. This means that the laws of physics remain the same in frames of reference that are not accelerating or experiencing any net force. Inertial frames are important because they provide a consistent and reliable framework for understanding the behavior of objects and phenomena in the universe.Rate this question:
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- 3.
The equation E = mc2 means that
- A.
Mass is really a bundle of energy traveling at the speed of light.
- B.
Mass and energy when combined travel at the speed of light.
- C.
Mass and energy when combined travel at twice the speed of light.
- D.
Energy and mass are different forms of the same thing.
Correct Answer
D. Energy and mass are different forms of the same thing.Explanation
The equation E = mc^2, derived by Albert Einstein, states that energy (E) and mass (m) are interchangeable and can be converted into each other. This equation shows that energy and mass are not separate entities but rather different forms of the same thing.Rate this question:
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- 4.
The purpose of the Michelson-Morley experiment was to
- A.
Determine the velocity of light.
- B.
Detect possible motion of the Earth relative to the sun.
- C.
Detect possible motion of the Earth relative to the ether.
- D.
Detect possible motion of the sun relative to the ether.
Correct Answer
C. Detect possible motion of the Earth relative to the ether.Explanation
The Michelson-Morley experiment was conducted to detect any possible motion of the Earth relative to the ether. The ether was a hypothetical substance believed to fill the empty space and serve as a medium for the propagation of light waves. The experiment aimed to measure the interference patterns of light waves traveling in different directions to determine if there was any variation caused by the Earth's motion through the ether. However, the experiment yielded unexpected results, showing no evidence of the Earth's motion relative to the ether. This experiment played a crucial role in the development of the theory of relativity.Rate this question:
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- 5.
Consider the list of physical properties below. According to special relativity, which ones are dependent on the observer speed?
- A.
Length
- B.
Energy
- C.
Time
- D.
All of these
Correct Answer
D. All of these Explanation
According to special relativity, all of the listed physical properties (length, energy, and time) are dependent on the observer's speed. This is because special relativity states that the laws of physics are the same for all observers in uniform motion relative to each other. As an observer's speed approaches the speed of light, these properties can change and are perceived differently by different observers. Therefore, all of these physical properties are influenced by the observer's speed.Rate this question:
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- 6.
According to variation of mass with velocity the relativistic mass m is given by (where m0 is rest mass of an object)
- A.
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- B.
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- C.
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- D.
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Correct Answer
A.Explanation
According to the theory of relativity, the relativistic mass of an object is given by the equation m = m0 / sqrt(1 - v^2/c^2), where m0 is the rest mass of the object, v is its velocity, and c is the speed of light. This equation shows that as the velocity of an object approaches the speed of light, its relativistic mass increases. This is due to the time dilation and length contraction effects predicted by relativity, which cause an increase in mass as an object's velocity increases.Rate this question:
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- 7.
‘Ionization of gas is produced when nuclear radiations pass through it’. This is the principle of which of the following detectors?
- A.
Liqud crystal counter
- B.
Flow counter
- C.
Geiger Muller counter
- D.
None of the above
Correct Answer
C. Geiger Muller counterExplanation
The principle of the Geiger Muller counter is based on the ionization of gas when nuclear radiations pass through it. This means that when the radiations interact with the gas molecules, they cause the gas atoms to lose electrons, creating positively charged ions. The Geiger Muller counter detects these ionizations by using a gas-filled chamber and measuring the electrical current produced when the ions move towards the electrodes. This principle allows the Geiger Muller counter to effectively detect and measure nuclear radiation levels.Rate this question:
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- 8.
Cyclotron was invented by
- A.
Sir Stephen Poplawski
- B.
Sir Ernest Lawrence
- C.
Sir Arthur Wynne
- D.
Sir John Biggins
Correct Answer
B. Sir Ernest LawrenceExplanation
Sir Ernest Lawrence is the correct answer because he is credited with inventing the cyclotron. Lawrence was an American physicist who developed the cyclotron in the 1930s. The cyclotron is a type of particle accelerator that uses a magnetic field to accelerate charged particles in a spiral path. Lawrence's invention revolutionized the field of nuclear physics and paved the way for further advancements in particle physics research.Rate this question:
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- 9.
Which of the following particle is not accelerated by cyclotron?
- A.
Electron
- B.
Alpha particle
- C.
Neutron
- D.
Proton
Correct Answer
C. NeutronExplanation
Neutrons are not accelerated by a cyclotron because they have no charge. Cyclotrons work by using an electric field to accelerate charged particles, such as electrons or protons, in a circular path. Since neutrons are electrically neutral, they do not experience a force in an electric field and therefore cannot be accelerated by a cyclotron.Rate this question:
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- 10.
In Nuclear fission reaction?
- A.
A heavy nucleus is fragmented into lighter ones.
- B.
A neutron is split into a neutron and proton.
- C.
Two light nuclei are combined into a heavier one.
- D.
A proton is split into three quarks.
Correct Answer
A. A heavy nucleus is fragmented into lighter ones.Explanation
In a nuclear fission reaction, a heavy nucleus is fragmented into lighter ones. This process releases a significant amount of energy.Rate this question:
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- 11.
In Nuclear reactor which of the following element used as Fuel
- A.
Uranium
- B.
Plutonium
- C.
Radium
- D.
None of the mentioned
Correct Answer
A. UraniumExplanation
Uranium is used as fuel in a nuclear reactor. Uranium is a naturally occurring element that can undergo nuclear fission, releasing a large amount of energy. This energy is harnessed in a nuclear reactor to generate electricity. Plutonium can also be used as fuel in certain types of reactors, but uranium is the most commonly used fuel in nuclear power plants. Radium is not used as fuel in nuclear reactors.Rate this question:
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- 12.
In Nuclear fusion reaction –
- A.
Two heavy nuclei of low mass to produce a light nucleus
- B.
Two light nuclei of low mass to produce a heavy nucleus
- C.
Two light nuclei of low mass to produce a light nucleus
- D.
None of the above
Correct Answer
B. Two light nuclei of low mass to produce a heavy nucleusExplanation
In a nuclear fusion reaction, two light nuclei of low mass combine to form a heavier nucleus. This process releases a large amount of energy. This is different from nuclear fission, where a heavy nucleus is split into two lighter nuclei. Fusion reactions are the process that powers the sun and other stars, and scientists are trying to replicate this process on Earth as a potential source of clean and abundant energy.Rate this question:
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- 13.
What type of Reaction takes place in sun?
- A.
Nuclear fusion
- B.
Nuclear fission
- C.
Spontaneous fission
- D.
Double beta decay
Correct Answer
A. Nuclear fusionExplanation
In the sun, nuclear fusion takes place. This is a process where two or more atomic nuclei combine to form a larger nucleus, releasing a large amount of energy in the process. In the sun's core, hydrogen atoms combine to form helium through nuclear fusion, releasing vast amounts of energy in the form of light and heat. This process is what powers the sun and allows it to emit heat and light.Rate this question:
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- 14.
A helium nucleus is also known as
- A.
Beta particle.
- B.
Alpha particle.
- C.
Gama particle
- D.
None of the above
Correct Answer
B. Alpha particle.Explanation
An alpha particle is the correct answer because a helium nucleus consists of two protons and two neutrons, which is the same composition as an alpha particle. Beta particles are high-energy electrons or positrons, and gamma particles are high-energy photons. None of the above options accurately describe a helium nucleus.Rate this question:
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- 15.
Gamma-ray photons have:
- A.
No mass and no electric charge
- B.
No mass and an electric charge of +1
- C.
No mass and an electric charge of +2
- D.
No mass and an electric charge of -1
Correct Answer
A. No mass and no electric chargeExplanation
Gamma-ray photons have no mass and no electric charge. Gamma rays are a form of electromagnetic radiation, just like visible light, but with much higher energy. Photons are the particles that make up electromagnetic radiation, and they have no mass and no electric charge. This means that gamma-ray photons are neutral and do not interact with electric or magnetic fields. They can travel long distances through space and penetrate matter easily due to their lack of charge and mass.Rate this question:
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- 16.
The short-lived isotopes of radioactive element emit more energetic alpha particles than long-lived ones. This is the statement of which law
- A.
Neutrino theory
- B.
Geiger Nuttal law
- C.
Gamow’s theory
- D.
None of the above
Correct Answer
B. Geiger Nuttal lawExplanation
The Geiger Nuttal law states that the more energetic alpha particles are emitted by short-lived isotopes of a radioactive element compared to long-lived ones. This law provides a correlation between the half-life of a radioactive isotope and the energy of the alpha particles it emits. The law suggests that as the half-life increases, the energy of the emitted alpha particles decreases. Therefore, the given statement aligns with the Geiger Nuttal law.Rate this question:
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- 17.
The particles which are also emitted during Beta decay are
- A.
Neutrinos
- B.
Neutron
- C.
Proton
- D.
Electrons
Correct Answer
A. NeutrinosExplanation
During beta decay, a neutron in the nucleus transforms into a proton and emits an electron (beta particle) and an antineutrino. The antineutrino is a neutral particle with extremely low mass and interacts weakly with matter. It carries away some of the energy and angular momentum from the decay process. Therefore, the correct answer is neutrinos, as they are emitted during beta decay along with electrons.Rate this question:
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- 18.
Who discovered radioactivity?
- A.
Louis Pasteur
- B.
Pierre Curie
- C.
Henri Becquerel
- D.
Antoine Lavoisier
Correct Answer
C. Henri BecquerelExplanation
Henri Becquerel discovered radioactivity. He made this discovery in 1896 while studying the effects of uranium salts on photographic plates. Becquerel accidentally left a uranium compound near the plates and noticed that they were still exposed, even though they were kept in a dark drawer. This led him to conclude that uranium emitted a form of radiation that could penetrate matter and affect photographic plates. Becquerel's discovery laid the foundation for further research on radioactivity by other scientists, including Marie and Pierre Curie.Rate this question:
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- 19.
Which one of the following radiations are more penetrating (more Energetic)
- A.
Alpha Radiations
- B.
Beta Radiation
- C.
Gamma Radiation
- D.
None of the above
Correct Answer
C. Gamma RadiationExplanation
Gamma radiation is more penetrating and energetic compared to alpha and beta radiations. Alpha radiation consists of helium nuclei and is the least penetrating due to its large size and positive charge. Beta radiation consists of fast-moving electrons or positrons and is more penetrating than alpha radiation but less penetrating than gamma radiation. Gamma radiation consists of high-energy photons and is the most penetrating and energetic of the three types of radiation.Rate this question:
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- 20.
Biophysics is the branch of science which deals with the study of
- A.
Physical principles involved in biology.
- B.
Chemical principles involved in biology.
- C.
Biological principles involved in Physics.
- D.
None of the above
Correct Answer
A. Physical principles involved in biology.Explanation
Biophysics is the branch of science that focuses on the application of physical principles to understand biological systems. It involves studying the physical properties and processes that occur in living organisms, such as the mechanics of cell membranes, the behavior of proteins, and the forces involved in DNA replication. By investigating the physical aspects of biological phenomena, biophysicists aim to gain a deeper understanding of how living organisms function at a molecular level. Therefore, the answer "Physical principles involved in biology" accurately describes the subject matter of biophysics.Rate this question:
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- 21.
Biopotential at cellular level is due to
- A.
Depolarization and repolarization of the Muscles
- B.
Depolarization and repolarization of the cell
- C.
Dissociation and association of the cell
- D.
Dissociation and association of the Muscles
Correct Answer
B. Depolarization and repolarization of the cell -
- 22.
The main function of _________system is to supply pure blood to the body parts and collect impure blood from the body
- A.
Cardiographic
- B.
Carcinogenetic
- C.
Cardionuclear
- D.
Cardiovascular
Correct Answer
D. CardiovascularExplanation
The cardiovascular system is responsible for supplying oxygenated blood to different parts of the body and collecting deoxygenated blood from the body. It consists of the heart, blood vessels, and blood. The heart pumps the blood, while the blood vessels act as the transportation network, carrying the blood to various organs and tissues. The cardiovascular system plays a crucial role in maintaining the body's overall function and ensuring the delivery of nutrients and oxygen to all cells.Rate this question:
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- 23.
In normal ECG, P wave signifies
- A.
Arterial deionization
- B.
Muscular depolarization
- C.
Arterial depolarization
- D.
Muscular deionization
Correct Answer
C. Arterial depolarizationExplanation
The correct answer is arterial depolarization. In a normal ECG, the P wave represents the depolarization of the atria, specifically the contraction of the atrial muscle. This electrical activity spreads through the atria, causing them to contract and pump blood into the ventricles. The depolarization of the atria is an important step in the cardiac cycle and is reflected as the P wave on an ECG.Rate this question:
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- 24.
The study and analysis of signals arising due to Electrical activity of brain is called as
- A.
Electroencephalogram or EEG
- B.
Electrocardiogram or ECG
- C.
Electro-orthogram or EOG
- D.
Electro-kidneygram or EKG
Correct Answer
A. Electroencephalogram or EEGExplanation
The correct answer is Electroencephalogram or EEG. This is because the study and analysis of signals arising due to electrical activity of the brain is specifically known as EEG. This technique involves placing electrodes on the scalp to measure and record the electrical activity of the brain, which can help diagnose various neurological disorders and study brain function. Electrocardiogram (ECG) is used to measure the electrical activity of the heart, while Electro-orthogram (EOG) and Electro-kidneygram (EKG) are not valid terms in the context of studying brain signals.Rate this question:
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- 25.
What is the principle of ultrasonography?
- A.
Medical imaging technique that uses medium frequency sound waves and their echoes
- B.
Medical imaging technique that uses low frequency sound waves and their echoes
- C.
Medical imaging technique that uses high frequency sound waves and their echoes
- D.
Medical imaging technique that uses ultra-low frequency sound waves and their echoes
Correct Answer
C. Medical imaging technique that uses high frequency sound waves and their echoesExplanation
Ultrasonography is a medical imaging technique that uses high frequency sound waves and their echoes. The high frequency of the sound waves allows for detailed imaging of internal organs and structures. The sound waves are emitted from a transducer and then bounce back as echoes when they encounter different tissues or structures in the body. These echoes are then used to create a visual representation of the internal structures, which can be used for diagnostic purposes.Rate this question:
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- 26.
An ideal Op-Amp has the characteristic –
- A.
Infinite voltage gain
- B.
Zero bandwidth
- C.
Infinite output resistance
- D.
None of the above
Correct Answer
A. Infinite voltage gainExplanation
An ideal Op-Amp is defined as having infinite voltage gain. This means that the output voltage of the Op-Amp will be infinitely larger than the input voltage. In practical terms, this means that the Op-Amp can amplify very small input signals to a much larger output signal. This characteristic makes the Op-Amp a versatile and powerful tool in many electronic applications.Rate this question:
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- 27.
In Op-Amp, the maximum rate of change in output voltage per unit time is defined as
- A.
Output impedance
- B.
Zero drift
- C.
The Slew Rate
- D.
Input impedance
Correct Answer
C. The Slew RateExplanation
The Slew Rate is the correct answer because it refers to the maximum rate of change in the output voltage per unit time in an operational amplifier (Op-Amp). It measures how quickly the output voltage can respond to changes in the input signal. A higher slew rate indicates a faster response time and better performance of the Op-Amp.Rate this question:
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- 28.
Voltage gain of inverting amplifier is given by (Where R1 and R0 are input resistance and output resistance respectively)
- A.
–R0 / R1
- B.
R1 / R0
- C.
R0 / R1
- D.
–R1 / R0
Correct Answer
A. –R0 / R1Explanation
The voltage gain of an inverting amplifier is determined by the ratio of the output resistance (R0) to the input resistance (R1), with a negative sign. This means that the correct answer is -R0 / R1.Rate this question:
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- 29.
The output voltage of Op-Amp as integrator is given by
- A.
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- B.
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- C.
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- D.
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Correct Answer
D.Explanation
The output voltage of an Op-Amp as an integrator is determined by the input voltage and the feedback capacitor. The input voltage is integrated over time by the capacitor, resulting in an output voltage that is proportional to the integral of the input voltage. This is achieved by connecting the input voltage to the inverting terminal of the Op-Amp and the feedback capacitor between the output and the inverting terminal. The integration function of the Op-Amp can be represented by the equation Vout = -1/(Rf*Cf) * ∫(Vin) dt, where Vout is the output voltage, Vin is the input voltage, Rf is the feedback resistor, Cf is the feedback capacitor, and ∫(Vin) dt represents the integral of the input voltage over time.Rate this question:
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- 30.
The voltage gain of an amplifier can be reduced by applying
- A.
A Positive feedback
- B.
Negative feedback
- C.
No feedback
- D.
Both Positive and Negative feedback
Correct Answer
B. Negative feedbackExplanation
Negative feedback is a technique used in amplifiers to reduce the voltage gain. It involves feeding back a portion of the output signal to the input in such a way that it opposes the input signal. This helps in stabilizing the amplifier's gain and reducing distortion. By introducing negative feedback, the overall gain of the amplifier is reduced, resulting in a more controlled and accurate amplification of the input signal.Rate this question:
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- 31.
Hartley oscillator is commonly used in ………………
- A.
Radio receivers
- B.
Radio transmitters
- C.
TV receivers
- D.
None of the above
Correct Answer
A. Radio receiversExplanation
The Hartley oscillator is commonly used in radio receivers. This oscillator circuit generates a continuous wave signal that can be used for tuning and amplifying radio frequency signals. It is specifically designed for use in radio receivers to provide a stable and reliable oscillating signal for proper functioning of the receiver.Rate this question:
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- 32.
How many inductors are there in the tank circuit of Colpitt’s oscillator?
- A.
1
- B.
2
- C.
3
- D.
0
Correct Answer
A. 1Explanation
There is only one inductor in the tank circuit of Colpitt's oscillator. The tank circuit is a combination of an inductor and a capacitor that determines the frequency of oscillation. In the case of Colpitt's oscillator, the tank circuit consists of a single inductor and a capacitor. Therefore, the correct answer is 1.Rate this question:
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- 33.
Fibre optical cables work on the principle of
- A.
Reflection of light
- B.
Total internal reflection
- C.
Total Internal refraction
- D.
Interference
Correct Answer
B. Total internal reflectionExplanation
Fibre optical cables work on the principle of total internal reflection. This phenomenon occurs when light traveling through a medium with a higher refractive index encounters a boundary with a medium of lower refractive index at an angle greater than the critical angle. Instead of refracting out of the medium, the light reflects back inside, allowing it to travel through the cable without significant loss of signal. Total internal reflection is crucial for transmitting data through fibre optic cables, as it ensures that the light signals remain confined within the cable and can travel long distances without significant degradation.Rate this question:
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- 34.
Outer optical material surrounding the core that reflects the light back into fibre optic cable is called as
- A.
Sheath
- B.
Axis
- C.
Cladding
- D.
Core
Correct Answer
C. CladdingExplanation
The outer optical material surrounding the core of a fibre optic cable is called cladding. Cladding is designed to have a lower refractive index than the core, which allows it to reflect the light back into the core through total internal reflection. This ensures that the light signal travels along the core without significant loss of signal strength. The cladding acts as a protective layer for the core, preventing external interference and maintaining the integrity of the optical signal.Rate this question:
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- 35.
In the fiber optic cable, the refractive index of cladding is always _______the refractive index of core.
- A.
Less than
- B.
Equal to
- C.
Greater than
- D.
None of the above
Correct Answer
A. Less thanExplanation
In fiber optic cables, the refractive index of the cladding is always less than the refractive index of the core. This is because the cladding is designed to have a lower refractive index in order to create total internal reflection within the core. This ensures that the light signals transmitted through the core are effectively contained and guided along the fiber without significant loss or dispersion.Rate this question:
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- 36.
The numerical aperture (NA) is the measure of how much light the fiber can collect. The expression for NA is (where θa is acceptance angle)
- A.
NA = sin θa
- B.
NA = cos θa
- C.
NA = tan θa
- D.
NA = sec θa
Correct Answer
A. NA = sin θaExplanation
The correct answer is NA = sin θa. The numerical aperture (NA) is a measure of the light-gathering ability of a fiber. It is determined by the acceptance angle (θa) of the fiber. The expression NA = sin θa indicates that the numerical aperture is equal to the sine of the acceptance angle. This means that the NA increases as the acceptance angle increases, allowing the fiber to collect more light.Rate this question:
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- 37.
‘Attenuation’ of light signal while traveling through the fiber optic cable is
- A.
The gain in signal power
- B.
The loss in signal power
- C.
The loss in signal phase
- D.
None of the above
Correct Answer
B. The loss in signal powerExplanation
Attenuation refers to the reduction in the intensity or power of a light signal as it travels through a fiber optic cable. Therefore, the correct answer is "The loss in signal power."Rate this question:
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- 38.
The angle at which the light must be transmitted through fiber optic cable in order to get maximum reflection is called as
- A.
Brewster’s angle
- B.
Angle of refraction
- C.
Acceptance angle
- D.
Angle of reflection
Correct Answer
C. Acceptance angleExplanation
The acceptance angle refers to the maximum angle at which light can enter a fiber optic cable and still be transmitted efficiently. This angle is determined by the refractive index of the fiber and the surrounding medium. If the angle of incidence exceeds the acceptance angle, the light will not be effectively transmitted and will experience significant losses. Therefore, the acceptance angle plays a crucial role in ensuring optimal transmission of light through fiber optic cables.Rate this question:
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- 39.
The process by which some characteristic property of high frequency wave is varied in accordance with the instantaneous value of signal is called as
- A.
Maturation
- B.
Moderation
- C.
Rectification
- D.
Modulation
Correct Answer
D. ModulationExplanation
Modulation is the process by which some characteristic property of a high frequency wave, such as amplitude, frequency, or phase, is varied in accordance with the instantaneous value of a signal. This allows the signal to be encoded onto the carrier wave, enabling it to be transmitted over long distances and received by a receiver. Modulation is commonly used in various communication systems, such as radio and television broadcasting, to ensure the accurate transmission and reception of signals.Rate this question:
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- 40.
In amplitude modulation
- A.
Frequency and phase remains constant
- B.
Frequency and phase changes
- C.
Frequency remains constant and phase changes
- D.
Frequency changes and phase remains constant
Correct Answer
A. Frequency and phase remains constantExplanation
In amplitude modulation, the process of varying the amplitude of a carrier signal with the input signal, the frequency and phase of the carrier signal remain constant. Only the amplitude of the carrier signal is modified to carry the information.Rate this question:
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- 41.
Modulation factor (m) of amplitude modulation is defined as (Where Es and Ec are peak voltage of signal wave and carrier wave respectively)
- A.
M = Ec / Es
- B.
M = Ec +Es
- C.
M = Es / Ec
- D.
M = Ec – Es
Correct Answer
C. M = Es / EcExplanation
The correct answer is m = Es / Ec. The modulation factor in amplitude modulation is defined as the ratio of the peak voltage of the signal wave (Es) to the peak voltage of the carrier wave (Ec). This ratio determines the extent to which the carrier wave is modulated by the signal wave. A modulation factor greater than 1 indicates overmodulation, while a value less than 1 indicates undermodulation.Rate this question:
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- 42.
The frequency of Carrier signal in modulation is ______ compared to signal wave
- A.
High
- B.
Low
- C.
Moderate
- D.
None of the above
Correct Answer
A. HighExplanation
In modulation, the frequency of the carrier signal is higher compared to the signal wave. Modulation involves superimposing the signal onto the carrier wave, and the carrier wave must have a higher frequency to carry the information efficiently. This allows for the transmission of the signal over long distances without significant loss or interference. Therefore, the correct answer is "High."Rate this question:
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- 43.
The disadvantage of AM is ___
- A.
Excess bandwidth and less transmitted power
- B.
Less bandwidth and high transmitted power
- C.
Excess bandwidth and high transmitted power
- D.
Less bandwidth and less transmitted power
Correct Answer
C. Excess bandwidth and high transmitted powerExplanation
The disadvantage of AM is excess bandwidth and high transmitted power. This means that AM requires a larger bandwidth to transmit the same amount of information compared to other modulation techniques. Additionally, AM also requires a higher transmitted power, which can lead to increased interference and reduced efficiency in the transmission.Rate this question:
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- 44.
The modulation index of FM is given by
- A.
Modulating frequency/ Carrier frequency
- B.
Modulating frequency /Frequency deviation
- C.
Frequency deviation/ Modulating frequency
- D.
Carrier frequency / Modulating frequency
Correct Answer
C. Frequency deviation/ Modulating frequencyExplanation
The modulation index of FM is given by the ratio of the frequency deviation to the modulating frequency. The frequency deviation refers to the maximum change in the carrier frequency caused by the modulation, while the modulating frequency is the frequency of the modulating signal. The modulation index represents the extent of frequency variation in the carrier signal due to the modulation.Rate this question:
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- 45.
Which of the following is not a positional number system?
- A.
Roman Number System
- B.
Octal Number System
- C.
Binary Number System
- D.
Hexadecimal Number System
Correct Answer
A. Roman Number SystemExplanation
The Roman Number System is not a positional number system because it does not follow the concept of place value. In a positional number system, the value of a digit depends on its position in the number. However, in the Roman Number System, the value of a symbol depends on its specific symbol, and there is no positional significance.Rate this question:
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- 46.
Convert hexadecimal number (E)16 in to binary number system
- A.
1011
- B.
1101
- C.
1111
- D.
1110
Correct Answer
D. 1110Explanation
The hexadecimal number (E)16 is equivalent to the binary number 1110. In the binary system, each digit represents a power of 2, starting from the rightmost digit as 2^0. Therefore, starting from the leftmost digit, the first digit represents 2^3, the second digit represents 2^2, the third digit represents 2^1, and the last digit represents 2^0. Adding up the values of these powers of 2 that correspond to the digits in the binary number gives us the decimal equivalent of the hexadecimal number. In this case, 1*2^3 + 1*2^2 + 1*2^1 + 0*2^0 = 8 + 4 + 2 + 0 = 14, which is represented as E in hexadecimal.Rate this question:
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- 47.
Which of the following is also called as universal logic gate?
- A.
NOT
- B.
AND
- C.
EX-OR
- D.
NAND
Correct Answer
D. NANDExplanation
The NAND gate is also known as a universal logic gate because it can be used to implement any other logic gate. It can perform the functions of AND, OR, and NOT gates by simply combining multiple NAND gates. This makes it a versatile and essential component in digital circuit design.Rate this question:
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- 48.
The difference between half adder and full adder is __________
- A.
Half adder has two inputs while full adder has four inputs
- B.
Half adder has one output while full adder has two outputs
- C.
Half adder has two inputs while full adder has three inputs
- D.
All of the Mentioned
Correct Answer
C. Half adder has two inputs while full adder has three inputsExplanation
A half adder is a digital circuit that adds two single-bit binary numbers and has two inputs, one for each bit. It produces a sum and a carry as outputs. On the other hand, a full adder is a digital circuit that adds three single-bit binary numbers, including a carry from a previous addition. It has three inputs, one for each bit and an additional carry input. It produces a sum and a carry as outputs. Therefore, the correct answer is "Half adder has two inputs while full adder has three inputs."Rate this question:
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- 49.
(AB)’ = A’ + B’ and (A + B)’ = A’ * B’. These theorems are known as _________
- A.
DeMorgan’s theorems
- B.
Boolean theorems
- C.
10’s complement theorems
- D.
None of the above
Correct Answer
A. DeMorgan’s theoremsExplanation
DeMorgan's theorems state that the complement of the product of two variables is equal to the sum of the complements of the individual variables, and the complement of the sum of two variables is equal to the product of the complements of the individual variables. These theorems are used in Boolean algebra to simplify logical expressions and manipulate logic gates. Therefore, the correct answer is DeMorgan's theorems.Rate this question:
-
- 50.
Logic gate circuits can be constructed using
- A.
LEDs
- B.
Diodes
- C.
Transistors
- D.
LDRs
Correct Answer
C. TransistorsExplanation
Transistors can be used to construct logic gate circuits. Transistors are semiconductor devices that can amplify or switch electronic signals and are commonly used in digital circuits. They can be used to create logic gates such as AND, OR, and NOT gates, which are the building blocks of digital systems. By combining transistors in different configurations, complex logic circuits can be constructed to perform various computational tasks. Therefore, transistors are a suitable option for constructing logic gate circuits.Rate this question:
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