# Online Preliminary Examination-may,2020 For B.Sc.-VI Semester,Organized By Department Of Physics,Sgmm Hingna,Dist-naGPur

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Quizzes Created: 2 | Total Attempts: 208
Questions: 25 | Attempts: 101

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B. Sc. Sem-VI Instructions for examination:
The Quiz is based on the R. T. M. Nagpur University Syllabus of B. Sc. (Physics).
B. Sc. Final Year (Semester VI)
Course-PHYSICS - Paper-I (601)
(Relativity, Nuclear physics and Bio Physics)
The Quiz consist of total 25 multiple choice questions.
Each question carry TWO marks
All Questions are Compulsory.
No negative marking
Has a time limit of 120 minutes
Has a pass mark of 50%
You can download certificate after finishing the quiz.

Questions and Answers
• 1.

### According to variation of mass with velocity the relativistic mass m is given by (where m0 is rest mass of an object)

Correct Answer
C.
Explanation
The correct answer is m = m0/sqrt(1 - v^2/c^2). This equation represents the variation of mass with velocity, known as relativistic mass. It shows that as an object's velocity approaches the speed of light (c), its mass increases. The denominator term (1 - v^2/c^2) accounts for the relativistic effects of time dilation and length contraction, ensuring that mass cannot exceed infinity. This equation is a fundamental concept in special relativity and helps explain the behavior of particles at high speeds.

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• 2.

### A frame of reference has four coordinates, x, y, z, and t is referred to as the_____________

• A.

Space-time reference

• B.

Four-dimensional plane

• C.

Non-inertial frame of reference

• D.

Inertial frame of reference

Correct Answer
A. Space-time reference
Explanation
A frame of reference with four coordinates, x, y, z, and t, is referred to as a space-time reference. This term combines the three dimensions of space (x, y, and z) with the dimension of time (t) to describe the position and motion of objects in a four-dimensional framework. It is used in the theory of relativity to understand how space and time are interconnected and how they affect the behavior of objects.

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• 3.

### Consider the list of physical properties below. According to special relativity, which ones are dependent on the observer speed?

• A.

Time

• B.

Energy

• C.

Length

• D.

All of these

Correct Answer
D. All of these
Explanation
According to special relativity, all of the listed physical properties - time, energy, and length - are dependent on the observer's speed. This is because special relativity states that as an observer's speed approaches the speed of light, time slows down, energy increases, and length contracts. Therefore, the observer's speed has an impact on all of these properties.

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• 4.

### The purpose of the Michelson-Morley experiment was to

• A.

Detect possible motion of the sun relative to the ether.

• B.

Detect possible motion of the Earth relative to the sun.

• C.

Determine the velocity of light.

• D.

Detect possible motion of the Earth relative to the ether.

Correct Answer
D. Detect possible motion of the Earth relative to the ether.
Explanation
The Michelson-Morley experiment was conducted to detect the possible motion of the Earth relative to the ether. The experiment aimed to measure the change in the speed of light in different directions as the Earth moved through the hypothetical ether medium. The null result of the experiment, which showed no variation in the speed of light, led to the rejection of the concept of the ether and had significant implications for the development of Einstein's theory of relativity.

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• 5.

### The equation E = mc2 means that

• A.

Mass and energy when combined travel at the speed of light.

• B.

Mass is really a bundle of energy traveling at the speed of light.

• C.

Energy and mass are different forms of the same thing.

• D.

Mass and energy when combined travel at twice the speed of light.

Correct Answer
C. Energy and mass are different forms of the same thing.
Explanation
The equation E = mc2, derived by Albert Einstein, states that energy (E) is equal to mass (m) multiplied by the speed of light squared (c2). This equation shows that mass and energy are interchangeable and can be converted into one another. It implies that mass is a form of energy and vice versa, highlighting the concept of mass-energy equivalence. Therefore, the correct answer is that energy and mass are different forms of the same thing.

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• 6.

### In Nuclear fission reaction?

• A.

A neutron is split into a neutron and proton.

• B.

Two light nuclei are combined into a heavier one.

• C.

A heavy nucleus is fragmented into lighter ones.

• D.

A proton is split into three quarks.

Correct Answer
C. 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 large amount of energy.

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• 7.

### Which of the following particle is not accelerated by cyclotron?

• A.

Electron

• B.

Alpha particle

• C.

Proton

• D.

Neutron

Correct Answer
D. Neutron
Explanation
Neutrons are not accelerated by cyclotrons because they do not carry an electric charge. Cyclotrons work by using an alternating electric field to accelerate charged particles in a circular path. Since neutrons are electrically neutral, they do not experience a force in the electric field and therefore do not get accelerated.

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• 8.

### Cyclotron was invented by

• A.

Sir Ernest Lawrence

• B.

Sir Stephen Poplawski

• C.

Sir Arthur Wynne

• D.

Sir John Biggins

Correct Answer
A. Sir Ernest Lawrence
Explanation
The correct answer is Sir Ernest Lawrence. He was an American physicist who invented the cyclotron in 1929. 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. His work earned him the Nobel Prize in Physics in 1939.

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• 9.

### 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 counter
Explanation
The correct answer is Geiger Muller counter. This type of detector operates based on the principle that when nuclear radiations pass through a gas, it causes ionization of the gas. The Geiger Muller counter detects these ionizations and produces an electrical pulse, which can be counted and measured. This principle is used in Geiger Muller counters to detect and measure the intensity of nuclear radiations.

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• 10.

### Mass defect and binding energy are equivalent

• A.

True

• B.

False

• C.

May be

• D.

None of the above

Correct Answer
A. True
Explanation
Mass defect and binding energy are equivalent because they both refer to the difference in mass between a nucleus and its individual nucleons. The mass defect is the difference between the mass of a nucleus and the sum of the masses of its protons and neutrons. This mass difference is converted into binding energy, which is the energy required to hold the nucleus together. Therefore, the two concepts are interconnected and can be considered equivalent.

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• 11.

### Gamma-ray photons have:

• A.

No mass and an electric charge of +1

• B.

No mass and an electric charge of +2

• C.

No mass and an electric charge of -1

• D.

No mass and no electric charge

Correct Answer
D. No mass and no electric charge
Explanation
Gamma-ray photons are particles of electromagnetic radiation. They are massless because they travel at the speed of light and have no rest mass. Additionally, gamma-ray photons have no electric charge because they are not composed of charged particles. Therefore, the correct answer is that gamma-ray photons have no mass and no electric charge.

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• 12.

### A helium nucleus is also known as

• A.

Beta particle.

• B.

Gamma particle

• C.

Alpha particle.

• D.

None of the above

Correct Answer
C. AlpHa particle.
Explanation
The correct answer is Alpha particle. A helium nucleus consists of two protons and two neutrons, which gives it a charge of +2. It is emitted during certain types of radioactive decay, such as alpha decay. Alpha particles have a high ionizing power and can be stopped by a few centimeters of air or a sheet of paper. They are commonly used in medical and industrial applications, as well as in particle physics research.

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• 13.

### What type of Reaction takes place in sun?

• A.

Double beta decay

• B.

Spontaneous fission

• C.

Nuclear fission

• D.

Nuclear fusion

Correct Answer
D. Nuclear fusion
Explanation
Nuclear fusion is the correct answer because it is the type of reaction that takes place in the sun. Nuclear fusion is the process in which two or more atomic nuclei combine to form a heavier nucleus, releasing a large amount of energy in the process. In the sun, hydrogen nuclei combine to form helium nuclei, releasing a tremendous amount of energy in the form of light and heat. This fusion reaction is what powers the sun and enables it to emit light and heat.

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• 14.

### In Nuclear fusion reaction –

• A.

Two light nuclei of low mass to produce a light nucleus

• B.

Two heavy nuclei of low mass to produce a light nucleus

• C.

Two light nuclei of low mass to produce a heavy nucleus

• D.

None of the above

Correct Answer
C. Two light nuclei of low mass to produce a heavy nucleus
Explanation
Nuclear fusion is a reaction in which two light nuclei 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 or more lighter nuclei. Therefore, the correct answer is "Two light nuclei of low mass to produce a heavy nucleus."

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• 15.

### In Nuclear reactor which of the following element used as Fuel

• A.

Radium

• B.

Plutonium

• C.

Uranium

• D.

None of the mentioned

Correct Answer
C. Uranium
Explanation
Uranium is used as fuel in nuclear reactors. Uranium-235 is the most commonly used isotope for nuclear fission reactions. It undergoes a process called nuclear fission, where the nucleus of the uranium atom is split into two smaller nuclei, releasing a large amount of energy. This energy is harnessed to generate electricity in nuclear power plants. Radium and plutonium are not typically used as fuel in nuclear reactors.

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• 16.

### Biophysics is the branch of science which deals with the study of

• A.

Biological principles involved in Physics.

• B.

Chemical principles involved in biology.

• C.

Physical principles involved in biology.

• D.

None of the above

Correct Answer
C. pHysical principles involved in biology.
Explanation
Biophysics is the branch of science that focuses on understanding the physical principles that govern biological systems. It involves the application of physics principles and techniques to study biological phenomena, such as the mechanics of cell membranes, the behavior of proteins, and the electrical properties of neurons. By studying the physical aspects of biological processes, biophysicists aim to gain a deeper understanding of how living organisms function. Therefore, the correct answer is "Physical principles involved in biology."

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• 17.

### Which one of the following radiations are more penetrating (more Energetic)

• A.

Alpha Radiations

• B.

Beta Radiation

• C.

Gamma Radiation

• D.

All of the above

Correct Answer
C. Gamma Radiation
Explanation
Gamma radiation is more penetrating and energetic than beta radiation and alpha radiation. Gamma radiation consists of high-energy photons that can easily pass through most materials, including thick layers of concrete and lead. Beta radiation consists of high-energy electrons or positrons, which have less penetrating power than gamma radiation and can be stopped by a few millimeters of aluminum or a few centimeters of plastic. Alpha radiation consists of helium nuclei, which have the least penetrating power and can be stopped by a sheet of paper or a few centimeters of air. Therefore, gamma radiation is the most energetic and penetrating out of the given options.

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• 18.

### Who discovered radioactivity?

• A.

Henri Becquerel

• B.

Louis Pasteur

• C.

Pierre Curie

• D.

Antoine Lavoisier

Correct Answer
A. Henri Becquerel
Explanation
Henri Becquerel discovered radioactivity. He accidentally discovered this phenomenon while conducting experiments with uranium salts. Becquerel noticed that a photographic plate, which he had left near the uranium salts, had been exposed without any external source of energy. This led him to conclude that uranium emits a form of radiation that can penetrate matter and affect photographic plates. This groundbreaking discovery paved the way for further research by scientists like Marie and Pierre Curie, who later expanded our understanding of radioactivity.

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• 19.

### The particles which are also emitted during Beta decay are

• A.

Neutron

• B.

Proton

• C.

Electrons

• D.

Neutrinos

Correct Answer
D. Neutrinos
Explanation
During beta decay, a neutron in the nucleus of an atom is converted into a proton, and an electron (beta particle) and an antineutrino are emitted. The antineutrino is often referred to as a neutrino, as both particles are very similar in nature but have opposite charges. Therefore, the correct answer is neutrinos.

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• 20.

### 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.

Gamow’s theory

• C.

Geiger Nuttal law

• D.

None of the above

Correct Answer
C. Geiger Nuttal law
Explanation
The Geiger Nuttal law states that the shorter the half-life of a radioactive isotope, the more energetic its emitted alpha particles will be. This law is based on the observation that as the half-life decreases, the probability of alpha decay increases, leading to more energetic alpha particles being emitted. Therefore, the correct answer is Geiger Nuttal law.

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• 21.

### What is the principle of ultrasonography?

• A.

Medical imaging technique that uses high 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 medium frequency sound waves and their echoes

• D.

Medical imaging technique that uses ultra-low frequency sound waves and their echoes

Correct Answer
A. Medical imaging technique that uses high frequency sound waves and their echoes
Explanation
Ultrasonography is a medical imaging technique that uses high frequency sound waves and their echoes. These high frequency sound waves are sent into the body and when they encounter different tissues or organs, they bounce back as echoes. These echoes are then used to create images of the internal structures of the body, allowing healthcare professionals to diagnose and monitor various conditions. The high frequency of the sound waves used in ultrasonography allows for better resolution and detailed imaging of the body's structures.

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• 22.

### 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 EEG
Explanation
The correct answer is Electroencephalogram or EEG. This is the study and analysis of signals that arise due to the electrical activity of the brain. EEG is commonly used in medical and research settings to monitor brain activity and diagnose various neurological conditions. It involves placing electrodes on the scalp to detect and record the electrical impulses produced by the brain.

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• 23.

### In normal ECG, P wave signifies

• A.

Arterial deionization

• B.

Arterial depolarization

• C.

Muscular depolarization

• D.

Muscular deionization

Correct Answer
B. Arterial depolarization
Explanation
The P wave in a normal ECG signifies arterial depolarization. Depolarization refers to the contraction of the heart muscle, and the P wave represents the depolarization of the atria. This electrical signal initiates the contraction of the atria, allowing them to pump blood into the ventricles. Therefore, the correct answer is arterial depolarization.

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• 24.

### The main function of _________system is to supply pure blood to the body parts and collect impure blood from the body

• A.

Cardiovascular

• B.

Cardiographic

• C.

Carcinogenetic

• D.

Cardionuclear

Correct Answer
A. Cardiovascular
Explanation
The cardiovascular system is responsible for supplying oxygenated blood to the body's tissues and organs and removing deoxygenated blood from them. It consists of the heart, blood vessels, and blood. The heart pumps the blood, while the blood vessels transport it throughout the body. This system plays a crucial role in maintaining the body's overall function and ensuring that all organs receive the necessary nutrients and oxygen for their proper functioning.

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• 25.

### Biopotential at cellular level is due to

• A.

Depolarization and repolarization of the cell

• B.

Depolarization and repolarization of the Muscles

• C.

Dissociation and association of the Muscles

• D.

Dissociation and association of the cell

Correct Answer
A. Depolarization and repolarization of the cell
Explanation
The biopotential at the cellular level is due to depolarization and repolarization of the cell. Depolarization refers to the change in the cell's membrane potential, where the inside of the cell becomes less negative. This change is caused by the influx of positive ions into the cell. Repolarization, on the other hand, is the process of restoring the cell's membrane potential back to its resting state. This is achieved by the efflux of positive ions from the cell. These processes of depolarization and repolarization are essential for generating electrical signals in cells, which play a crucial role in various physiological processes.

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• Mar 20, 2023
Quiz Edited by
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• May 13, 2020
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