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Physics 1 Marks Question

Physical World · Haryana Board (HBSE) STD 11 Science (Haryana - English Medium). 48 questions.

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Question 11 Mark
Textbooks on science may give you a wrong impression that studying science is dry and all too serious and that scientists are absent-minded introverts who never laugh or grin. This image of science and scientists is patently false. Scientists, like any other group of humans, have their share of humorists, and many have led their lives with a great sense of fun and adventure, even as they seriously pursued their scientific work. Two great physicists of this genre are Gamow and Feynman. You will enjoy reading their books listed in the Bibliography.
Answer
It is not an exercise as such but is a statement of fact. We can add the name of other scientist who were humorists along with being physicists. They are C.V. Raman, Homi Jahangir Bhabha, Einstein and Bohr. India have several politicians like M.M. Joshi, V.P. singh etc. who are physicists. President A.P.J. Kalam is also a great nuclear scientist.
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Question 21 Mark
Science, like any knowledge, can be put to good or bad use, depending on the user. Given below are some of the applications of science. Formulate your views on whether the particular application is good, bad or something that cannot be so clearly categorised:
  1. Mass vaccination against small pox to curb and finally eradicate this disease from the population. $($This has already been successfully done in India$).$
  2. Television for eradication of illiteracy and for mass communication of news and ideas.
  3. Prenatal sex determination.
  4. Computers for increase in work efficiency.
  5. Putting artificial satellites into orbits around the Earth.
  6. Development of nuclear weapons.
  7. Development of new and powerful techniques of chemical and biological warfare.
  8. Purification of water for drinking.
  9. Plastic surgery.
  10. Cloning.
Answer
  1. The small pox virus kills so many human beings and survivors have permanent effects. Thus, the mass vaccination against smallpox is good for society.
  2. Television for the eradication of literacy and for mass communication of news and ideas is good.
  3. Parental sex determination is considered to be bad because it leads to gender imbalance and it is banned legally in many countries.
  4. Computers are helpful to do a work in an efficient manner and in an effective way. It results in globalization and increases connectivity between people around the world. Thus, Computers are considered to be good.
  5. Launching of artificial satellites is good because the internet, television, a Global positioning system $\text{(GPS)}$ and many other bridges between human across the great seas are based on this artificial satellite.
  6. Even though Development of nuclear physics leads to effective generations of electricity it is considered to be bad. Because, it gives rise to the destruction of human colonies during wars, insert permanent changes to genes of living beings and cause environmental changes.
  7. Development of new and powerful techniques of chemical and biological warfare is bad. It can be simply misused by terrorists, anti$-$government societies, etc.
  8. Purification of Drinking water is good. It is the main problem that we are facing nowadays.
  9. Plastic surgery is considered to be good. Because, it gives new life to victims of acid drop, fire accidents, and many others.
  10. Cloning is cannot be categorized. Because, reproduction of new organs using cloning is good but, production of whole human being leads to so many social and security problems.
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Question 31 Mark
Name the scientist and the country of his origin whose field of work was 'cosmic rays'.
Answer
Hess, Austria.
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Question 41 Mark
What do you mean by mass-energy equivalence? Give example.
Answer
According to Albert Einstein, energy and mass are interconvertible. Example: An $\mathrm{e}^{-}$(electron) collides with an $\mathrm{e}^{+}$ (positron) and the two annihilate giving two photons. The total mass of $\mathrm{e}^{-}$and $\mathrm{e}^{+}$is converted into energy.
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Question 71 Mark
Which scientist received Nobel prize for his work on Molecular spectra?
Answer
C.V. Raman (the great Indian scientist) received Nobel prize for his work on molecular spectra.
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Question 81 Mark
What is unified field theory?
Answer
The theory with which scientists try to unify all forces is called unified field theory.
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Question 91 Mark
Can gravitational force exist without any physical contact between acting bodies?
Answer
Yes, gravitational force exist without any physical contact between acting bodies.
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Question 101 Mark
Arrange four types of basic forces in the order of increasing strength in code using $a, b, c$ and $d:$
  1. Gravitational forces.
  2. Electromagnetic forces.
  3. Nuclear forces.
  4. Electrostatic forces.
Answer
  1. Electromagnetic forces.
  1. Electrostatic forces.
  1. Nuclear forces.
  1. Gravitational forces.
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Question 111 Mark
What do you understand by the term scientific method?
Answer
The systematic observations, reasoning, mathematical modelling and theoretical prediction form the scientific method.
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Question 121 Mark
Name the force which builds the universe.
Answer
Quark - Quark force caused by the exchange of particles called 'gluons' is the basic force.
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Question 131 Mark
Give two areas in which Physics and Technology are closely interlinked.
Answer
Laser and micro electronics.
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Question 141 Mark
What is the basic mechanism behind all forces?
Answer
Exchange of particles is responsible for the attractive or interactive forces.
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Question 161 Mark
Name the force which builds the universe.
Answer
Quark Quark force caused by the exchange of particles called 'gluons' is the basic force.
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Question 171 Mark
How much stronger nuclear force is compared to electromagnetic force?
Answer
A strong nuclear force is 100 times stronger than the electromagnetic force in strength.
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Question 181 Mark
What is unified field theory?
Answer
The theory with which scientists try to unify all forces is called unified field theory.
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Question 191 Mark
Give the nature of work for which Prof. Einstein was awarded Nobel Prize in Physics.
Answer
Einstein's photoelectric equation.
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MCQ 201 Mark
Who discovered cosmic radiations?
  • A
    Curie.
  • B
    Hubble.
  • ✓
    $\text{P.M.S}$. Blackett.
  • D
    Maxwell.
Answer
Correct option: C.
$\text{P.M.S}$. Blackett.
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Question 221 Mark
How many electrons would weigh 1kg? [Given mass of one electron $= 9.11 \times 10^{-31} \text{kg}$
Answer
Mass of 1 electron $= 9.11 \times 10^{-31} \text{kg}$ For, $\text{n}\times9.11\times10^{-31}=1\text{kg}$ $\therefore\text{n}=\frac{1}{9.11\times10^{-31}}\approx1.1\times10^{30}$
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Question 241 Mark
Name the two most important contributions of Albert Einstein.
Answer
The two most important contributions of Albert Einstein are 'theory of relativity' and 'explanation of photoelectric effect’.
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Question 251 Mark
Define binding energy.
Answer
The energy used in the process of binding masses together is called binding energy.
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Question 271 Mark
Give one major discovery resulted due to basic laws of electricity and magnetism.
Answer
Wireless communication technology was a major discovery due to laws of electricity and magnetism.
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Question 311 Mark
Name the scientist and the country of his origin whose field of work was 'elasticity'.
Answer
Robert Hooke, England.
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Question 321 Mark
Which group of Physics has recently came into existence?
Answer
An intermediate group of Physics namely mesoscopic Physics has recently came into existence.
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Question 331 Mark
Why do we call Physics an exact Science?
Answer
Most of measurement in Physics are made with high precise and accuracy, so it is called an exact Science.
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Question 341 Mark
How many nanometer constitute 4 metre?
Answer
$\mathrm{n} \times 10^{-9}=4\left(\right.$ As $\left.1 \mathrm{~nm}=10^{-9} \mathrm{~m}.\right) \mathrm{n}=4 \times 10^9$
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Question 351 Mark
What is the relation between bar and torr?
Answer
Both are units of measuring pressure. $1 \mathrm{bar}=1 \mathrm{~atm}$. pressure $=760 \mathrm{~mm}$ of Hg column
$=10^5 \mathrm{Nm}^{-2}$
and 1 torr $=1 \mathrm{~mm}$ of Hg column
Clearly, 1 bar = 760 torr.
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Question 361 Mark
Textbooks on science may give you a wrong impression that studying science is dry and all too serious and that scientists are absent-minded introverts who never laugh or grin. This image of science and scientists is patently false. Scientists, like any other group of humans, have their share of humorists, and many have led their lives with a great sense of fun and adventure, even as they seriously pursued their scientific work. Two great physicists of this genre are Gamow and Feynman. You will enjoy reading their books listed in the Bibliography.
Answer
It is not an exercise as such but is a statement of fact. We can add the name of other scientist who were humorists along with being physicists. They are C.V. Raman, Homi Jahangir Bhabha, Einstein and Bohr. India have several politicians like M.M. Joshi, V.P. singh etc. who are physicists. President A.P.J. Kalam is also a great nuclear scientist.
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Question 371 Mark
Name two Indian born physicists who have been awarded Nobel Prize in physics.
Answer
Dr. Sir C.V. Raman and Subramanium Chandrasekhar.
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Question 391 Mark
Give two approaches to study Physics.
Answer
Two approaches to study Physics are unification and reduction.
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Question 401 Mark
What is a scientific method?
Answer
A scientific method consists of observations, proposal of a theory, tests, and modification of theory etc.
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Question 411 Mark
Name two major groups of Physics.
Answer
The two major groups of Physics are microscopic group and macroscopic group.
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Question 431 Mark
Give two attributes which remain conserved in strong forces besides momentum and energy.
Answer
Parity and strangeness.
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Question 451 Mark
Name the contribution made by the following physicists :
  1. Maxwell.
  2. Max Planck.
  3. $C.V$. Raman.
  4. de Broglie.
Answer
  1. Maxwell: Electromagnetic theory.
  2. Max Planck: Quantum theory.
  3. $C.V$. Raman: Raman effect.
  4. De Broglie: Wave nature of particles.
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Question 461 Mark
What do you mean by conserved quantities?
Answer
Conserved quantities are those physical quantities that remain unchanged in a process.
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Question 471 Mark
Science, like any knowledge, can be put to good or bad use, depending on the user. Given below are some of the applications of science. Formulate your views on whether the particular application is good, bad or something that cannot be so clearly categorised:
  1. Mass vaccination against small pox to curb and finally eradicate this disease from the population. $($This has already been successfully done in India$)$.
  2. Television for eradication of illiteracy and for mass communication of news and ideas.
  3. Prenatal sex determination.
  4. Computers for increase in work efficiency.
  5. Putting artificial satellites into orbits around the Earth.
  6. Development of nuclear weapons.
  7. Development of new and powerful techniques of chemical and biological warfare.
  8. Purification of water for drinking.
  9. Plastic surgery.
  10. Cloning.
Answer
  1. The small pox virus kills so many human beings and survivors have permanent effects. Thus, the mass vaccination against smallpox is good for society.
  2. Television for the eradication of literacy and for mass communication of news and ideas is good.
  3. Parental sex determination is considered to be bad because it leads to gender imbalance and it is banned legally in many countries.
  4. Computers are helpful to do a work in an efficient manner and in an effective way. It results in globalization and increases connectivity between people around the world. Thus, Computers are considered to be good.
  5. Launching of artificial satellites is good because the internet, television, a Global positioning system $\text{(GPS)}$ and many other bridges between human across the great seas are based on this artificial satellite.
  6. Even though Development of nuclear physics leads to effective generations of electricity it is considered to be bad. Because, it gives rise to the destruction of human colonies during wars, insert permanent changes to genes of living beings and cause environmental changes.
  7. Development of new and powerful techniques of chemical and biological warfare is bad. It can be simply misused by terrorists, anti$-$government societies, etc.
  8. Purification of Drinking water is good. It is the main problem that we are facing nowadays.
  9. Plastic surgery is considered to be good. Because, it gives new life to victims of acid drop, fire accidents, and many others.
  10. Cloning is cannot be categorized. Because, reproduction of new organs using cloning is good but, production of whole human being leads to so many social and security problems.
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Question 481 Mark
Name the scientific principle behind the technology, 'nuclear reactor.'
Answer
Controlled nuclear fission is the scientific principle behind the technology of steam engine.
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