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All questions of Physical World for NEET Exam
Can you explain the answer of this question below:The phenomenon of Photoelectric effect is used in
- A:
Photocell
- B:
Sonar
- C:
Electron Microscope
- D:
Optical fibers
The answer is a.
The phenomenon of Photoelectric effect is used in
Photocell
Sonar
Electron Microscope
Optical fibers
 | Anirban Shah answered |
A photocell is a practical application of the phenomenon of photoelectric effect. When light of frequency greater than the threshold frequency of the cathode material falls on the cathode, photoelectrons are emitted. These electrons are collected by the anode and an electric current starts flowing in the external circuit. The current increases with the increase in the intensity of light. The current would stop, if the light does not fall on the cathode.
Which is the strongest fundamental force of nature?- a)Gravitational force
- b)Weak nuclear force
- c)Strong nuclear force
- d)Electromagnetic force
Correct answer is option 'A'. Can you explain this answer?
Which is the strongest fundamental force of nature?
a)
Gravitational force
b)
Weak nuclear force
c)
Strong nuclear force
d)
Electromagnetic force
 | Geetika Shah answered |
The strong nuclear force, also called the strong nuclear interaction, is the strongest of the four fundamental forces of nature.
Who discovered radioactivity?- a)Einstein
- b)Henri Becquerel
- c)Marie Curie
- d)C.V. Raman
Correct answer is option 'B'. Can you explain this answer?
Who discovered radioactivity?
a)
Einstein
b)
Henri Becquerel
c)
Marie Curie
d)
C.V. Raman
| | Janani Iyer answered |
Discovery of Radioactivity
Radioactivity is the property of certain elements to emit radiation spontaneously without any external influence. The discovery of radioactivity is a significant event in the history of science. It is the result of the cumulative efforts of many scientists over the years.
Henri Becquerel
Henri Becquerel was a French physicist who discovered radioactivity in 1896. He was the first person to observe the phenomenon of natural radioactivity. He was carrying out experiments with uranium salts, which he believed to emit light when exposed to sunlight. He wrapped the salts in black paper and placed them on top of photographic plates. When he developed the plates, he found that they had been exposed to some kind of radiation, even though they had not been exposed to light.
Further Contributions
Becquerel's discovery of radioactivity paved the way for further research into the phenomenon. Marie Curie, a Polish-born French physicist, and her husband Pierre Curie conducted extensive research on radioactivity, which led to the discovery of two new elements, radium, and polonium.
Conclusion
In conclusion, Henri Becquerel is credited with the discovery of radioactivity. His discovery opened up a new field of research in physics and chemistry and led to many important discoveries in the field of nuclear science. Today, radioactivity has many practical applications, including in medical imaging and cancer treatment.
Radioactivity is the property of certain elements to emit radiation spontaneously without any external influence. The discovery of radioactivity is a significant event in the history of science. It is the result of the cumulative efforts of many scientists over the years.
Henri Becquerel
Henri Becquerel was a French physicist who discovered radioactivity in 1896. He was the first person to observe the phenomenon of natural radioactivity. He was carrying out experiments with uranium salts, which he believed to emit light when exposed to sunlight. He wrapped the salts in black paper and placed them on top of photographic plates. When he developed the plates, he found that they had been exposed to some kind of radiation, even though they had not been exposed to light.
Further Contributions
Becquerel's discovery of radioactivity paved the way for further research into the phenomenon. Marie Curie, a Polish-born French physicist, and her husband Pierre Curie conducted extensive research on radioactivity, which led to the discovery of two new elements, radium, and polonium.
Conclusion
In conclusion, Henri Becquerel is credited with the discovery of radioactivity. His discovery opened up a new field of research in physics and chemistry and led to many important discoveries in the field of nuclear science. Today, radioactivity has many practical applications, including in medical imaging and cancer treatment.
Can you explain the answer of this question below:Which is the strongest fundamental force of nature?A:Gravitational forceB:Weak nuclear forceC:Strong nuclear forceD:Electromagnetic forceThe answer is c.
 | Hansa Sharma answered |
The strong nuclear force, also called the strong nuclear interaction, is the strongest of the four fundamental forces of nature.
Can you explain the answer of this question below:Which scientist does not belong to Germany?- A:Hertz
- B:Werner Heisenberg
- C:Roentgen
- D:Niels Bohr
The answer is d.
Which scientist does not belong to Germany?
A:
Hertz
B:
Werner Heisenberg
C:
Roentgen
D:
Niels Bohr
 | Sinjini Shah answered |
Heinrich Rudolf Hertz was a German physicist who first conclusively proved the existence of the electromagnetic waves predicted by James Clerk Maxwell's equations of electromagnetism.
Werner Karl Heisenberg was a German theoretical physicist and one of the key pioneers of quantum mechanics.
Wilhelm Conrad Röntgen was a German mechanical engineer and physicist
Niels Henrik David Bohr was a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922.
Can you explain the answer of this question below:The wave nature of electrons is used in which of the following devices?
- A:
Photocell
- B:
Electron microscope
- C:
Tokamak
- D:
Aeroplane
The answer is b.
The wave nature of electrons is used in which of the following devices?
Photocell
Electron microscope
Tokamak
Aeroplane
| | Geetika Shah answered |
- The electron microscope uses the wave nature of electrons for its functioning.
- It uses a beam of accelerated electrons as a source of illumination.
Electron Microscope:
The phenomenon of Photoelectric effect is used in- a)Photocell
- b)Sonar
- c)Electron Microscope
- d)Optical fibers
Correct answer is option 'A'. Can you explain this answer?
The phenomenon of Photoelectric effect is used in
a)
Photocell
b)
Sonar
c)
Electron Microscope
d)
Optical fibers
 | Mira Sharma answered |
A photocell is a practical application of the phenomenon of photoelectric effect.
When light of frequency greater than the threshold frequency of the cathode material falls on the cathode, photoelectrons are emitted. These electrons are collected by the anode and an electric current starts flowing in the external circuit. The current increases with the increase in the intensity of light. The current would stop, if the light does not fall on the cathode.
Electromagnetic force is stronger than gravitational force by a factor of- a)1010
- b)1036
- c)103
- d)100
Correct answer is option 'B'. Can you explain this answer?
Electromagnetic force is stronger than gravitational force by a factor of
a)
1010
b)
1036
c)
103
d)
100
 | Rahul Chaudhary answered |
Gravity is also one of the four fundamental forces which govern all interactions in nature (along with weak nuclear force, strong nuclear force, and electromagnetism). Of these forces, gravity is the weakest, being approximately 1038 times weaker than the strong nuclear force, 1036 times weaker than the electromagnetic force and 1029 times weaker than the weak nuclear force.
What is central to the growth of physics?- a)Qualitative descriptions
- b)Conjectural descriptions
- c)Speculative descriptions
- d)Quantitative measurement
Correct answer is option 'D'. Can you explain this answer?
What is central to the growth of physics?
a)
Qualitative descriptions
b)
Conjectural descriptions
c)
Speculative descriptions
d)
Quantitative measurement
 | Suresh Iyer answered |
Quantitative measurement is central to the growth of physics because Laws of nature happen to be expressible in more precise mathematical equations.
Which is the strongest fundamental force of nature?- a)Gravitational force
- b)Weak nuclear force
- c)Strong nuclear force
- d)Electromagnetic force
Correct answer is 'D'. Can you explain this answer?
Which is the strongest fundamental force of nature?
a)
Gravitational force
b)
Weak nuclear force
c)
Strong nuclear force
d)
Electromagnetic force
 | Krishna Iyer answered |
The strong nuclear force, also called the strong nuclear interaction, is the strongest of the four fundamental forces of nature.
The fundamental force with the shortest range is- a)Gravitational Force
- b)Weak Nuclear Force
- c)Strong Nuclear Force
- d)Electromagnetic Force
Correct answer is option 'B'. Can you explain this answer?
The fundamental force with the shortest range is
a)
Gravitational Force
b)
Weak Nuclear Force
c)
Strong Nuclear Force
d)
Electromagnetic Force
 | Riya Banerjee answered |
There are four fundamental forces in nature which are Gravitational force, Strong force, Weak force and Electromagnetic force.
Gravitational Force: This force is the weakest but has an infinite range.
Strong Nuclear force: This force holds the nucleus of an atom together. It is the strongest of the forces. It acts over a range of about 10-15m.
Weak Nuclear Force: This force is weak compared to the strong force as the name implies and has the shortestrange of 10-18m
Electromagnetic Force: This is the second strongest force after the strong force and it acts on electrically charged particles. It has strength of 1/137 relative to the strong force but has an infinite range.
Physics is a- a)Engineering Science
- b)Mathematical Science
- c)Applied Science
- d)Natural Science
Correct answer is option 'D'. Can you explain this answer?
Physics is a
a)
Engineering Science
b)
Mathematical Science
c)
Applied Science
d)
Natural Science
 | Nandini Patel answered |
Physics is a natural science based on experiments, measurements and mathematical analysis with the purpose of finding quantitative physical laws for everything from the nanoworld of the microcosmos to the planets, solar systems and galaxies that occupy the macrocosmos.
On which laws is the principle of rocket propulsion based?- a)Newton’s first law of motion
- b)Newton’s law of gravitation
- c)Laws of thermodynamics
- d)None of these
Correct answer is option 'D'. Can you explain this answer?
On which laws is the principle of rocket propulsion based?
a)
Newton’s first law of motion
b)
Newton’s law of gravitation
c)
Laws of thermodynamics
d)
None of these
| | Geetika Shah answered |
- Propulsion is the act of moving or pushing an object forward. A propulsion system is an engine that produces thrust to push an object, such as an airplane or rocket, forward.
- The propulsion of all rockets is explained by the same physical principle: Newton’s third law of motion.
- It states that all forces exist in pairs: if one object A exerts a force FA on a second object B, then B simultaneously exerts a force FB on A, and the two forces are equal and opposite: FA = −FB.
- A rocket’s acceleration depends on three major factors: the exhaust velocity, the rate the exhaust is ejected, and the mass of the rocket.
- To achieve the high speeds needed to hop continents, obtain orbit, or escape Earth’s gravity altogether, the mass of the rocket other than fuel must be as small as possible.
Which force operates among the heavier elementary particles?- a)Strong nuclear force
- b)Electromagnetic force
- c)Gravitational force
- d)Weak nuclear force
Correct answer is option 'A'. Can you explain this answer?
Which force operates among the heavier elementary particles?
a)
Strong nuclear force
b)
Electromagnetic force
c)
Gravitational force
d)
Weak nuclear force
| | Geetika Shah answered |
- The strong interaction is the attractive force that brings quarks (elementary particles) together to form nucleons (protons and neutrons).
- Strong nuclear force operates among the heavier elementary particles and the nucleons.
Which force operates among the heavier elementary particles?- a)Strong nuclear force
- b)Electromagnetic force
- c)Gravitational force
- d)Weak nuclear force
Correct answer is 'A'. Can you explain this answer?
Which force operates among the heavier elementary particles?
a)
Strong nuclear force
b)
Electromagnetic force
c)
Gravitational force
d)
Weak nuclear force
| | Neha Joshi answered |
- The strong interaction is the attractive force that brings quarks (elementary particles) together to form nucleons (protons and neutrons).
- Strong nuclear force operates among the heavier elementary particles and the nucleons.
Earth pulls every object towards it with a force called:- a)Friction
- b)Gravity
- c)Tension
- d)Collision
Correct answer is option 'B'. Can you explain this answer?
Earth pulls every object towards it with a force called:
a)
Friction
b)
Gravity
c)
Tension
d)
Collision
| | Nandini Iyer answered |
Gravitational force of the earth acts from the centre of the earth and pulls every substance towards itself.
Which of the following statements is correct?- a)Newton belonged to U.K., who discovered law of gravitation.
- b)Einstein belonged to England, who discovered laws of photoelectric effect.
- c)John Bardeen belonged to France, who discovered transistors.
- d)W.K. Roentgen belonged to Holland, who discovered X-rays.
Correct answer is option 'A'. Can you explain this answer?
Which of the following statements is correct?
a)
Newton belonged to U.K., who discovered law of gravitation.
b)
Einstein belonged to England, who discovered laws of photoelectric effect.
c)
John Bardeen belonged to France, who discovered transistors.
d)
W.K. Roentgen belonged to Holland, who discovered X-rays.
 | Ananya Das answered |
The difference between nuclear forces and electromagnetic forces is that- a)nuclear forces have longer range compared to electromagnetic forces
- b)nuclear forces are mediated by photons compared to gluons for electromagnetic forces
- c)nuclear forces do not depend on charge
- d)nuclear forces are weaker compared to electromagnetic forces
Correct answer is option 'C'. Can you explain this answer?
The difference between nuclear forces and electromagnetic forces is that
a)
nuclear forces have longer range compared to electromagnetic forces
b)
nuclear forces are mediated by photons compared to gluons for electromagnetic forces
c)
nuclear forces do not depend on charge
d)
nuclear forces are weaker compared to electromagnetic forces
| | Rahul Bansal answered |
The electromagnetic force is a long range force which acts of charged particles. Like charges repel and unlike charges attract.
The colour force binds quarks together. It binds three quarks to make a baryon such as a proton or neutron. It binds two quarks to make a meson. The strong nuclear force is actually a residual effect of the colour force where quarks in a proton or neutron get bound to quarks in adjacent protons and neutrons. This effectively binds protons and neutrons to make a nucleus.
The weak nuclear force is responsible for radioactive beta decay. It can convert a proton into a neutron, a positron and an electron neutrino. It can also convert a neutron into a proton, an electron and an electron antineutrino.
The strong nuclear force is very short range and can only bind adjacent protons and neutrons. The electromagnetic force is long range. Thus every proton in a nucleus repels every other proton. This is which heavy elements are unstable.
The microscopic domain of physics deals with- a)The constitution and structure of matter at the scales of atoms and nuclei and their interaction with different elementary particles
- b)The constitution and structure of matter at the scales of atoms and nuclei and their interaction with different bodies on the earth
- c)The constitution and structure of matter at the scales of stars and planets and their interaction with different elementary particles
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
The microscopic domain of physics deals with
a)
The constitution and structure of matter at the scales of atoms and nuclei and their interaction with different elementary particles
b)
The constitution and structure of matter at the scales of atoms and nuclei and their interaction with different bodies on the earth
c)
The constitution and structure of matter at the scales of stars and planets and their interaction with different elementary particles
d)
None of these
| | Raghav Bansal answered |
Microscopic domain includes atomic,molecular and nuclear phenomena. It can be said as the study of matter.It includes the study of structure and configuration of atom,nucleus and the constitute particles of atom-electron,proton,neutron and interaction with elementary particles like electron,photon etc.
Gravity is defined as:- a)The push of the earth
- b)The force of the earth
- c)The capacity of the earth
- d)The pull of the earth
Correct answer is option 'D'. Can you explain this answer?
Gravity is defined as:
a)
The push of the earth
b)
The force of the earth
c)
The capacity of the earth
d)
The pull of the earth
 | Preeti Iyer answered |
Gravitational force of the earth acts from the centre of the earth and pulls every substance towards itself.
For motion under an external conservative force- a)the mechanical energy i.e. the potential energy of a body is a constant
- b)the total mechanical energy i.e. the sum of kinetic and potential energy of a body is a constant only if there is no motion
- c)the total mechanical energy i.e. the sum of kinetic and potential energy of a body is a constant
- d)the mechanical energy i.e. the kinetic energy of a body is a constant
Correct answer is option 'C'. Can you explain this answer?
For motion under an external conservative force
a)
the mechanical energy i.e. the potential energy of a body is a constant
b)
the total mechanical energy i.e. the sum of kinetic and potential energy of a body is a constant only if there is no motion
c)
the total mechanical energy i.e. the sum of kinetic and potential energy of a body is a constant
d)
the mechanical energy i.e. the kinetic energy of a body is a constant
| | Megha Desai answered |
Explanation:
Motion under an external conservative force is a type of motion in which the force acting on the body is conservative, i.e., it can be derived from a potential energy function.
Total Mechanical Energy:
The total mechanical energy of a body is the sum of its kinetic energy and potential energy.
- Kinetic Energy: The energy possessed by a body due to its motion is called kinetic energy. It is given by the formula KE = 1/2mv², where m is the mass of the body and v is its velocity.
- Potential Energy: The energy possessed by a body due to its position or configuration is called potential energy. It is given by the formula PE = mgh, where m is the mass of the body, g is the acceleration due to gravity, and h is the height of the body above a reference level.
Conservation of Mechanical Energy:
In motion under an external conservative force, the total mechanical energy of a body is conserved, i.e., it remains constant throughout the motion.
This can be explained by the principle of conservation of energy, which states that energy can neither be created nor destroyed, but can only be transferred from one form to another.
Since the force acting on the body is conservative, the work done by it is independent of the path taken by the body. Therefore, the work done by the force can be expressed as the difference between the initial and final potential energies of the body.
If the body is moving, then its kinetic energy is also changing. However, the total mechanical energy of the body remains constant, as the increase in kinetic energy is compensated by the decrease in potential energy, and vice versa.
Therefore, the correct option is (c) The total mechanical energy i.e. the sum of kinetic and potential energy of a body is a constant.
Motion under an external conservative force is a type of motion in which the force acting on the body is conservative, i.e., it can be derived from a potential energy function.
Total Mechanical Energy:
The total mechanical energy of a body is the sum of its kinetic energy and potential energy.
- Kinetic Energy: The energy possessed by a body due to its motion is called kinetic energy. It is given by the formula KE = 1/2mv², where m is the mass of the body and v is its velocity.
- Potential Energy: The energy possessed by a body due to its position or configuration is called potential energy. It is given by the formula PE = mgh, where m is the mass of the body, g is the acceleration due to gravity, and h is the height of the body above a reference level.
Conservation of Mechanical Energy:
In motion under an external conservative force, the total mechanical energy of a body is conserved, i.e., it remains constant throughout the motion.
This can be explained by the principle of conservation of energy, which states that energy can neither be created nor destroyed, but can only be transferred from one form to another.
Since the force acting on the body is conservative, the work done by it is independent of the path taken by the body. Therefore, the work done by the force can be expressed as the difference between the initial and final potential energies of the body.
If the body is moving, then its kinetic energy is also changing. However, the total mechanical energy of the body remains constant, as the increase in kinetic energy is compensated by the decrease in potential energy, and vice versa.
Therefore, the correct option is (c) The total mechanical energy i.e. the sum of kinetic and potential energy of a body is a constant.
What is the relation between morality and science?- a)Morality can be derived from scientific principles
- b)Morality is not the subject matter of science
- c)Science has proved that morality is impractical
- d)Science is immoral
Correct answer is option 'B'. Can you explain this answer?
What is the relation between morality and science?
a)
Morality can be derived from scientific principles
b)
Morality is not the subject matter of science
c)
Science has proved that morality is impractical
d)
Science is immoral
| | Pooja Mehta answered |
The relationship between theories and facts. There were a fair number of questions about the relationship between theories and the facts that they predict. In particular, it was frequently pointed out that the facts just seem to be particular instances of the theories. That's true in both the physical and moral cases.
Which of these was a major technological achievement in ancient India?- a)Paṇini's morphological analysis
- b)Cataract surgery of physician Sushruta
- c)Vedanga Jyotiṣa containing details of astronomical calculations, calendrical studies, and established rules for empirical observation
- d)Baudhayana Sulba Sutra, which contains examples of simple Pythagorean triples, as well as a statement of the Pythagorean Theorem for the sides of a square
Correct answer is option 'B'. Can you explain this answer?
Which of these was a major technological achievement in ancient India?
a)
Paṇini's morphological analysis
b)
Cataract surgery of physician Sushruta
c)
Vedanga Jyotiṣa containing details of astronomical calculations, calendrical studies, and established rules for empirical observation
d)
Baudhayana Sulba Sutra, which contains examples of simple Pythagorean triples, as well as a statement of the Pythagorean Theorem for the sides of a square
| | Gaurav Kumar answered |
The Suśruta-saṃhitā is one of the most important surviving ancient treatises on medicine and is considered a foundational text of Ayurveda. The treatise addresses all aspects of general medicine, but the translator G. D. Singhal dubbed Suśruta "the father of surgery" on account of the extraordinarily accurate and detailed accounts of surgery to be found in the work. He has also been called "the first plastic surgeon".
One example where technology predates science is- a)TV
- b)Steam engine
- c)Radio
- d)Laser surgery
Correct answer is option 'B'. Can you explain this answer?
One example where technology predates science is
a)
TV
b)
Steam engine
c)
Radio
d)
Laser surgery
| | Neha Sharma answered |
Thomas Newcomen's atmospheric engine was the first commercial true steam engine using a piston, and was used in 1712 for pumping in a mine.
Weak Nuclear Force- a)is responsible for holding the constituents of the nucleus together
- b)is responsible for holding the electrons of the nucleus together
- c)is responsible for holding the electrons and the nucleus together
- d)is responsible for a common form of radioactivity called beta decay
Correct answer is option 'D'. Can you explain this answer?
Weak Nuclear Force
a)
is responsible for holding the constituents of the nucleus together
b)
is responsible for holding the electrons of the nucleus together
c)
is responsible for holding the electrons and the nucleus together
d)
is responsible for a common form of radioactivity called beta decay
| | Pooja Mehta answered |
The weak nuclear force is one of the four fundamental forces of physics through which particles interact with each other, together with the strong force, gravity, and electromagnetism. Compared to both electromagnetism and the strong nuclear force, the weak nuclear force has a much weaker intensity, which is why it has the name weak nuclear force. The theory of the weak force was first proposed by Enrico Fermi in 1933, and was known at that time as Fermi's interaction. The weak force is mediated by two types of gauge bosons: the Z boson and W boson.
Classical physics does not include subjects like- a)mechanics
- b)light
- c)heat
- d)elementary particles
Correct answer is option 'D'. Can you explain this answer?
Classical physics does not include subjects like
a)
mechanics
b)
light
c)
heat
d)
elementary particles
| | Anjali Sharma answered |
In classical theory theories of mechanics, relativity, field theory is not included. These are the category of subject which comes under Quantum mechanics(Physics) where we study small particles and classical physics also include electromagnetism (light, heat).
Sir C.V. Raman got Nobel Prize in physics for- a)refraction of light
- b)reflection of light
- c)scattering of light
- d)dispersion of light
Correct answer is option 'C'. Can you explain this answer?
Sir C.V. Raman got Nobel Prize in physics for
a)
refraction of light
b)
reflection of light
c)
scattering of light
d)
dispersion of light
| | Ananya Das answered |
Sir C.V. Raman got Nobel prize for Raman effect, which deals with scattering of light.
Can you explain the answer of this question below:The sun releases energy coming from
- A:
weak electrical forces
- B:
gravitational forces
- C:
electromagnetic waves
- D:
strong nuclear forces
The answer is d.
The sun releases energy coming from
weak electrical forces
gravitational forces
electromagnetic waves
strong nuclear forces
| | Anjali Iyer answered |
The sun, like all active stars, is a massive hydrogen-burning furnace producing huge amounts of light, heat and radiation, about 4 x 10^26 watts every second. The sun, in fact, is the origin of all energy on the earth, even fossil fuels. The process by which the sun creates and releases energy is called fusion.
Technology started with- a)invention of printing press
- b)invention of power loom
- c)the conversion of natural resources into simple tools
- d)invention of steam engine
Correct answer is option 'C'. Can you explain this answer?
Technology started with
a)
invention of printing press
b)
invention of power loom
c)
the conversion of natural resources into simple tools
d)
invention of steam engine
| | Sagar Goyal answered |
The beginning of technology can be traced back to the conversion of natural resources into simple tools. This marked the transition from the Stone Age to the Bronze Age, when humans started using metals to create more complex tools.
Importance of natural resources
Natural resources such as wood, stone, bones, and fibers were the first materials used by humans to create tools. These resources were readily available in the environment and were used to create simple tools like knives, spears, and axes. The early humans realized that by using these tools, they could make their work easier and faster.
The evolution of technology
As humans became more skilled at creating tools, they started using more complex materials like copper, bronze, and iron. This led to the development of new technologies like metallurgy and smelting, which allowed for the creation of more advanced tools and weapons.
The impact of technology
The development of technology had a significant impact on human society. It led to the growth of agriculture, the rise of civilizations, and the development of trade and commerce. It also led to new forms of communication like writing and printing, which allowed for the sharing of knowledge and ideas.
Conclusion
In conclusion, technology started with the conversion of natural resources into simple tools. This marked the beginning of human innovation and creativity, which has continued to shape the world we live in today. The evolution of technology has had a profound impact on human society, and it will continue to do so for many years to come.
Importance of natural resources
Natural resources such as wood, stone, bones, and fibers were the first materials used by humans to create tools. These resources were readily available in the environment and were used to create simple tools like knives, spears, and axes. The early humans realized that by using these tools, they could make their work easier and faster.
The evolution of technology
As humans became more skilled at creating tools, they started using more complex materials like copper, bronze, and iron. This led to the development of new technologies like metallurgy and smelting, which allowed for the creation of more advanced tools and weapons.
The impact of technology
The development of technology had a significant impact on human society. It led to the growth of agriculture, the rise of civilizations, and the development of trade and commerce. It also led to new forms of communication like writing and printing, which allowed for the sharing of knowledge and ideas.
Conclusion
In conclusion, technology started with the conversion of natural resources into simple tools. This marked the beginning of human innovation and creativity, which has continued to shape the world we live in today. The evolution of technology has had a profound impact on human society, and it will continue to do so for many years to come.
Proper framework for explaining microscopic phenomena is- a)Quantum Theory
- b)Theory of relativity
- c)Maxwell’s theory
- d)Classical physics
Correct answer is option 'A'. Can you explain this answer?
Proper framework for explaining microscopic phenomena is
a)
Quantum Theory
b)
Theory of relativity
c)
Maxwell’s theory
d)
Classical physics
| | Gaurav Kumar answered |
Quantum mechanics (QM -- also known as quantum physics, or quantum theory) is a branch of physics which deals with physical phenomena at nanoscopic scales where the action is on the order of the Planck constant. It departs from classical mechanics primarily at the quantum realm of atomic and subatomic length scales.
Scientific method involves- a)Systematic observations, experiments, results and antiquated observations
- b)Mathematical reasoning, quantitative approach towards questions
- c)Making observations, formulating a hypothesis, and conducting scientific experiments
- d)Reporting a question, making assumptions and controlled experiments
Correct answer is option 'C'. Can you explain this answer?
Scientific method involves
a)
Systematic observations, experiments, results and antiquated observations
b)
Mathematical reasoning, quantitative approach towards questions
c)
Making observations, formulating a hypothesis, and conducting scientific experiments
d)
Reporting a question, making assumptions and controlled experiments
 | Akash Nair answered |
Explanation:
Scientific method is a process of investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge. It involves a number of steps that include making observations, formulating a hypothesis, and conducting scientific experiments. The correct answer is option 'C'. Let's discuss each step in detail:
1. Making observations: The first step in the scientific method is to make observations of the natural world. These observations can be made through direct or indirect means, and can involve any of the five senses.
2. Formulating a hypothesis: After making observations, scientists formulate a hypothesis or tentative explanation that can account for the observations. A hypothesis is a testable statement that can be supported or refuted through experimentation.
3. Conducting scientific experiments: Once a hypothesis has been formulated, scientists conduct experiments to test the hypothesis. Experiments are designed to isolate the effect of a single variable on the phenomenon being studied, while all other variables are held constant.
4. Analyzing results: After conducting experiments, scientists analyze the results to determine whether they support or refute the hypothesis. This involves statistical analysis and comparing the results to previous studies.
5. Drawing conclusions: Based on the results of the experiments, scientists draw conclusions about the validity of the hypothesis. If the hypothesis is supported, it may be accepted as a scientific theory or law.
In summary, the scientific method involves making observations, formulating a hypothesis, conducting scientific experiments, analyzing results, and drawing conclusions.
Scientific method is a process of investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge. It involves a number of steps that include making observations, formulating a hypothesis, and conducting scientific experiments. The correct answer is option 'C'. Let's discuss each step in detail:
1. Making observations: The first step in the scientific method is to make observations of the natural world. These observations can be made through direct or indirect means, and can involve any of the five senses.
2. Formulating a hypothesis: After making observations, scientists formulate a hypothesis or tentative explanation that can account for the observations. A hypothesis is a testable statement that can be supported or refuted through experimentation.
3. Conducting scientific experiments: Once a hypothesis has been formulated, scientists conduct experiments to test the hypothesis. Experiments are designed to isolate the effect of a single variable on the phenomenon being studied, while all other variables are held constant.
4. Analyzing results: After conducting experiments, scientists analyze the results to determine whether they support or refute the hypothesis. This involves statistical analysis and comparing the results to previous studies.
5. Drawing conclusions: Based on the results of the experiments, scientists draw conclusions about the validity of the hypothesis. If the hypothesis is supported, it may be accepted as a scientific theory or law.
In summary, the scientific method involves making observations, formulating a hypothesis, conducting scientific experiments, analyzing results, and drawing conclusions.
Technology strives- a)to use science for application
- b)to fulfill a human need such as faster cooking or sewing etc
- c)to perfect science
- d)to invent better rat traps
Correct answer is option 'B'. Can you explain this answer?
Technology strives
a)
to use science for application
b)
to fulfill a human need such as faster cooking or sewing etc
c)
to perfect science
d)
to invent better rat traps
| | Suresh Iyer answered |
Science and technology will continue to generate all sorts of new enhancers, and the quest for enhancement is not necessarily unfair or unethical. We humans are inveterate enhancers, striving to increase our intelligence and to improve our memory and powers of perception.
What is the correct sequence of events technology gives rise to new science or new science gives rise to technology?- a)Science can give rise to technology only
- b)Technology and science are independent
- c)Both can happen. Science can give rise to technology and technology can give rise to new science
- d)Technology can give rise to new science only
Correct answer is option 'C'. Can you explain this answer?
What is the correct sequence of events technology gives rise to new science or new science gives rise to technology?
a)
Science can give rise to technology only
b)
Technology and science are independent
c)
Both can happen. Science can give rise to technology and technology can give rise to new science
d)
Technology can give rise to new science only
 | Jatin Sharma answered |
Technology is often a consequence of science and engineering, although technology as a human activity precedes the two fields. For example, science might study the flow of electrons in electrical conductors by using already-existing tools and knowledge. This new-found knowledge may then be used by engineers to create new tools and machines such as semiconductors, computers, and other forms of advanced technology.
Can you explain the answer of this question below:Scientists strategy in general is to
- A:
Focus first on the essential features of a phenomenon and remove its less significant aspects.
- B:
Keep building complicated theories
- C:
Focus first on the complex features of a phenomenon and add its less significant aspects from the start
- D:
Focus first on the complex features of a phenomenon and remove its less significant aspects
The answer is a.
Scientists strategy in general is to
Focus first on the essential features of a phenomenon and remove its less significant aspects.
Keep building complicated theories
Focus first on the complex features of a phenomenon and add its less significant aspects from the start
Focus first on the complex features of a phenomenon and remove its less significant aspects
| | Geetika Shah answered |
It is not practical to take into account all the complexities of a phenomenon in one go.A good and scientific strategy is to focus first on the essential features, discover the basic principles and then introduce corrections to build a more refined theory of the phenomenon by removing its less significant aspects.
In every conservation principle- a)a physical quantity like mass is converted into energy
- b)a physical quantity changes to a form of energy
- c)a physical quantity for example total momentum does not change in a phenomenon. The quantity has the same value before and after the phenomenon.
- d)a physical quantity like energy is converted into mass
Correct answer is option 'C'. Can you explain this answer?
In every conservation principle
a)
a physical quantity like mass is converted into energy
b)
a physical quantity changes to a form of energy
c)
a physical quantity for example total momentum does not change in a phenomenon. The quantity has the same value before and after the phenomenon.
d)
a physical quantity like energy is converted into mass
 | Ishita Reddy answered |
Explanation:In physics, a conservation law states that a particular measurable property of an isolated physical system does not change as the system evolves over time. Exact conservation laws include conservation of energy, conservation of linear momentum, conservation of angular momentum, and conservation of electric charge.
Which scientist does not belong to Germany?- a)Hertz
- b)Werner Heisenberg
- c)Roentgen
- d)Niels Bohr
Correct answer is option 'D'. Can you explain this answer?
Which scientist does not belong to Germany?
a)
Hertz
b)
Werner Heisenberg
c)
Roentgen
d)
Niels Bohr
 | Himanshu answered |
Niels Bohr belongs to Denmark not Germany.
Which of the following statements is incorrect?- a)Bohr gave theory of hydrogen atom and Yukawa, the theory of nuclear forces
- b)Law of gravitation was discovered by Newton and principle of inertia by Galileo
- c)Laws of photoelectric effect were discovered by Einstein and laws of electromagnetic induction by Faraday
- d)Neutron was discovered by J.J. Thomson and electron was discovered by James Chadwick
Correct answer is option 'D'. Can you explain this answer?
Which of the following statements is incorrect?
a)
Bohr gave theory of hydrogen atom and Yukawa, the theory of nuclear forces
b)
Law of gravitation was discovered by Newton and principle of inertia by Galileo
c)
Laws of photoelectric effect were discovered by Einstein and laws of electromagnetic induction by Faraday
d)
Neutron was discovered by J.J. Thomson and electron was discovered by James Chadwick
| | Riya Banerjee answered |
Neutron was discovered by James Chadwick and electron was discovered by J.J. Thomson.
No physicist has ever “seen” an electron. Yet, all physicists believe in the existence of electrons. An intelligent but superstitious man advances this analogy to argue that ‘ghosts’ exist even though no one has seen one. How will you refute his argument ?- a)science does not deal with ghosts because they don’t exist
- b)electrons have been discovered by great scientists but no great scientist claimed to find ghosts
- c)there is no scientific study of ghosts so they cannot exist
- d)existence of electrons can be demonstrated by experiments but existence of ghosts cannot be
Correct answer is option 'D'. Can you explain this answer?
No physicist has ever “seen” an electron. Yet, all physicists believe in the existence of electrons. An intelligent but superstitious man advances this analogy to argue that ‘ghosts’ exist even though no one has seen one. How will you refute his argument ?
a)
science does not deal with ghosts because they don’t exist
b)
electrons have been discovered by great scientists but no great scientist claimed to find ghosts
c)
there is no scientific study of ghosts so they cannot exist
d)
existence of electrons can be demonstrated by experiments but existence of ghosts cannot be
| | Krishna Iyer answered |
It is simply a superstition that ghost exist. There is not even single authentic evidence that ghosts exists. On the other hand it is a fact that atoms exists. There are many examples to prove this fact. Atomic power plant, atomic bombs, atomic clocks etc., exist of the correlation between two parts of the statement.
A scientific theory is accepted if- a)The theory is approved by a panel of people after studying the theory only
- b)The theory is derivable from other theories logically.
- c)The theory is very simple elegant or very complicated
- d)Predictions of the theory are confirmed by experiments
Correct answer is option 'D'. Can you explain this answer?
A scientific theory is accepted if
a)
The theory is approved by a panel of people after studying the theory only
b)
The theory is derivable from other theories logically.
c)
The theory is very simple elegant or very complicated
d)
Predictions of the theory are confirmed by experiments
| | Geetika Shah answered |
A scientific theory is an explanation of some aspect of the natural world that can, in accordance with the scientific method, be repeatedly tested, using a predefined protocol of observations and experiments.Established scientific theories have withstood rigorous scrutiny and are a comprehensive form of scientific knowledge.
Inverse square law of distance is followed by- a)Gravitational forces
- b)Electromagnetic forces
- c)Both (a) and (b)
- d)Neither (a) and nor (b)
Correct answer is option 'C'. Can you explain this answer?
Inverse square law of distance is followed by
a)
Gravitational forces
b)
Electromagnetic forces
c)
Both (a) and (b)
d)
Neither (a) and nor (b)
| | Ajay Yadav answered |
Both gravitational and electromagnetic forces follow inverse square law of distance.
The scientific method is- a)A prescribed method for investigating phenomena, acquiring new knowledge...
- b)A body of techniques for investigating phenomena, acquiring new knowledge...
- c)A procedure for proposing new hypothesis
- d)A method for proposing new theories.
Correct answer is option 'B'. Can you explain this answer?
The scientific method is
a)
A prescribed method for investigating phenomena, acquiring new knowledge...
b)
A body of techniques for investigating phenomena, acquiring new knowledge...
c)
A procedure for proposing new hypothesis
d)
A method for proposing new theories.
| | Rajesh Gupta answered |
The scientific method is a body of techniques for investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge. To be termed scientific, a method of inquiry is commonly based on empirical or measurable evidence subject to specific principles of reasoning.
The phenomenon of Photoelectric effect is used in- a)Photocell
- b)Sonar
- c)Electron Microscope
- d)Optical fibers
Correct answer is 'A'. Can you explain this answer?
The phenomenon of Photoelectric effect is used in
a)
Photocell
b)
Sonar
c)
Electron Microscope
d)
Optical fibers
| | Naina Bansal answered |
A photocell is a practical application of the phenomenon of photoelectric effect.
When light of frequency greater than the threshold frequency of the cathode material falls on the cathode, photoelectrons are emitted. These electrons are collected by the anode and an electric current starts flowing in the external circuit. The current increases with the increase in the intensity of light. The current would stop, if the light does not fall on the cathode.
Who was the first to introduce the concept of antiparticle theoretically?- a)Niels Bohr
- b)Ernest Rutherford
- c)Albert Einstein
- d)Paul Dirac
Correct answer is option 'D'. Can you explain this answer?
Who was the first to introduce the concept of antiparticle theoretically?
a)
Niels Bohr
b)
Ernest Rutherford
c)
Albert Einstein
d)
Paul Dirac
| | Sreemoyee Saha answered |
Paul Dirac was the first to introduce the concept of antiparticle theoretically.
Dirac's Equation and Prediction of Antimatter
- In 1928, Paul Dirac developed an equation that combined quantum mechanics and special relativity.
- The equation predicted the existence of particles with negative energy, which was a new and strange concept in physics.
- Dirac realized that these particles could be interpreted as antiparticles, particles with the same mass but opposite charge to their corresponding particles.
- This prediction led to the discovery of the first antiparticle, the positron, by Carl Anderson in 1932.
Dirac's Contribution to Antimatter Theory
- Dirac's theory of antiparticles contributed significantly to the development of quantum field theory, which describes particles and their interactions.
- The discovery of antiparticles has since led to numerous applications in fields such as medicine, particle physics, and materials science.
- Dirac's work also contributed to the understanding of the relationship between matter and antimatter, which remains an active area of research in physics.
Conclusion
In conclusion, Paul Dirac was the first to introduce the concept of antiparticle theoretically, through his development of the Dirac equation in 1928. His work has been instrumental in the development of quantum field theory and has led to numerous practical applications in various fields.
Dirac's Equation and Prediction of Antimatter
- In 1928, Paul Dirac developed an equation that combined quantum mechanics and special relativity.
- The equation predicted the existence of particles with negative energy, which was a new and strange concept in physics.
- Dirac realized that these particles could be interpreted as antiparticles, particles with the same mass but opposite charge to their corresponding particles.
- This prediction led to the discovery of the first antiparticle, the positron, by Carl Anderson in 1932.
Dirac's Contribution to Antimatter Theory
- Dirac's theory of antiparticles contributed significantly to the development of quantum field theory, which describes particles and their interactions.
- The discovery of antiparticles has since led to numerous applications in fields such as medicine, particle physics, and materials science.
- Dirac's work also contributed to the understanding of the relationship between matter and antimatter, which remains an active area of research in physics.
Conclusion
In conclusion, Paul Dirac was the first to introduce the concept of antiparticle theoretically, through his development of the Dirac equation in 1928. His work has been instrumental in the development of quantum field theory and has led to numerous practical applications in various fields.
Which of these is incorrect about nuclear forces?- a)They are independent of charge
- b)Nuclear forces are derived from quark-quark interaction
- c)Hadrons do experience strong nuclear force
- d)Nuclear force is not central force
Correct answer is option 'C'. Can you explain this answer?
Which of these is incorrect about nuclear forces?
a)
They are independent of charge
b)
Nuclear forces are derived from quark-quark interaction
c)
Hadrons do experience strong nuclear force
d)
Nuclear force is not central force
| | Geetika Shah answered |
Hadrons are subatomic composite porticle made of two(or) more quarks. They experpance strong nuclear force.
What is the study of the modern theory of the strong forces between quarks?- a)Quantum chromodynamics
- b)Quantum electromagnetism
- c)Quantum electrodynamics
- d)Quantum astronomy
Correct answer is option 'A'. Can you explain this answer?
What is the study of the modern theory of the strong forces between quarks?
a)
Quantum chromodynamics
b)
Quantum electromagnetism
c)
Quantum electrodynamics
d)
Quantum astronomy
| | Preeti Iyer answered |
Quantum chromodynamics is as quantum field theory in which strong interaction is described in terms of an interaction between quarks.
Which is the strongest fundamental force of nature?- a)Gravitational force
- b)Weak nuclear force
- c)Strong nuclear force
- d)Electromagnetic force
Correct answer is 'A'. Can you explain this answer?
Which is the strongest fundamental force of nature?
a)
Gravitational force
b)
Weak nuclear force
c)
Strong nuclear force
d)
Electromagnetic force
| | Nandini Patel answered |
The universe has a lot of forces, a lot of pushes and pulls. We're always pushing or pulling something, even if only the ground. But it turns out that in physics, there are really only four fundamental forces from which everything else is derived: the strong force, the weak force, the electromagnetic force, and the gravitational force.
The gravitational force is a force that attracts any two objects with mass. We call the gravitational force attractive because it always tries to pull masses together, it never pushes them apart. In fact, every object, including you, is pulling on every other object in the entire universe! This is called Newton's Universal Law of Gravitation. Admittedly, you don't have a very large mass and so, you're not pulling on those other objects much. And objects that are really far apart from each other don't pull on each other noticeably either. But the force is there and we can calculate it
Which force is weakest of all fundamental forces?- a)Gravitational force
- b)Electromagnetic force
- c)Weak nuclear force
- d)Strong nuclear force
Correct answer is option 'A'. Can you explain this answer?
Which force is weakest of all fundamental forces?
a)
Gravitational force
b)
Electromagnetic force
c)
Weak nuclear force
d)
Strong nuclear force
| | Naina Sharma answered |
Gravitational force is the attraction between two masses.
Electromagnetic force is the force between two charged particles or two poles of a magnet. It is stronger than Gravitational.
Weak nuclear force is the weak force of attraction between the subatomic particles of the nucleus of an atom. Though the name suggests that it is weak, it is stronger than electromagnetic.
Strong nuclear force is the stronger version of nuclear force.It is the strongest force in nature.
Which domain of physics deals with atomic, molecular, and nuclear phenomena?- a)Macroscopic domain
- b)Microscopic domain
- c)Quantum mechanics
- d)Thermodynamics
Correct answer is option 'B'. Can you explain this answer?
Which domain of physics deals with atomic, molecular, and nuclear phenomena?
a)
Macroscopic domain
b)
Microscopic domain
c)
Quantum mechanics
d)
Thermodynamics
| | Megha Das answered |
Understanding the Domains of Physics
Physics can be broadly categorized into different domains based on the scale of phenomena being studied. These include macroscopic, microscopic, and quantum mechanical domains.
Microscopic Domain Explained
- The microscopic domain specifically deals with the behavior of matter at atomic and molecular levels.
- This domain encompasses phenomena that occur within atoms and molecules, such as chemical reactions and bonding.
Atomic, Molecular, and Nuclear Phenomena
- Atomic phenomena include the study of electrons, protons, neutrons, and their interactions.
- Molecular phenomena involve how atoms bond to form molecules and how these molecules interact.
- Nuclear phenomena focus on the processes occurring within atomic nuclei, such as radioactive decay and nuclear fusion.
Importance of the Microscopic Domain
- Understanding these microscopic interactions is crucial for fields such as chemistry, materials science, and biophysics.
- The principles derived from the microscopic domain are foundational for advancements in technology and medicine, such as drug development and nanotechnology.
Other Domains for Context
- The macroscopic domain deals with large-scale phenomena that can be observed directly, such as mechanics and fluid dynamics.
- Quantum mechanics, while closely related, focuses on the behavior of particles at the quantum level, which can also include subatomic phenomena.
In conclusion, option 'B', the microscopic domain, is the correct answer as it specifically addresses atomic, molecular, and nuclear phenomena, making it a key area of study in physics.
Physics can be broadly categorized into different domains based on the scale of phenomena being studied. These include macroscopic, microscopic, and quantum mechanical domains.
Microscopic Domain Explained
- The microscopic domain specifically deals with the behavior of matter at atomic and molecular levels.
- This domain encompasses phenomena that occur within atoms and molecules, such as chemical reactions and bonding.
Atomic, Molecular, and Nuclear Phenomena
- Atomic phenomena include the study of electrons, protons, neutrons, and their interactions.
- Molecular phenomena involve how atoms bond to form molecules and how these molecules interact.
- Nuclear phenomena focus on the processes occurring within atomic nuclei, such as radioactive decay and nuclear fusion.
Importance of the Microscopic Domain
- Understanding these microscopic interactions is crucial for fields such as chemistry, materials science, and biophysics.
- The principles derived from the microscopic domain are foundational for advancements in technology and medicine, such as drug development and nanotechnology.
Other Domains for Context
- The macroscopic domain deals with large-scale phenomena that can be observed directly, such as mechanics and fluid dynamics.
- Quantum mechanics, while closely related, focuses on the behavior of particles at the quantum level, which can also include subatomic phenomena.
In conclusion, option 'B', the microscopic domain, is the correct answer as it specifically addresses atomic, molecular, and nuclear phenomena, making it a key area of study in physics.
Which of the following statements is not correct?- a)Physics is the study of nature and natural phenomena.
- b)Physics and technology are not related to each other.
- c)Electrodynamics deals with electric and magnetic phenomena associated with charged and magnetic bodies.
- d)The physical quantities that remain unchanged in a process are called conserved quantities.
Correct answer is option 'B'. Can you explain this answer?
Which of the following statements is not correct?
a)
Physics is the study of nature and natural phenomena.
b)
Physics and technology are not related to each other.
c)
Electrodynamics deals with electric and magnetic phenomena associated with charged and magnetic bodies.
d)
The physical quantities that remain unchanged in a process are called conserved quantities.
| | Sanjana Sharma answered |
Explanation:
The statement that is not correct is option 'B': Physics and technology are not related to each other. This statement is false because physics and technology are closely related to each other. Here are some points to explain the relationship between physics and technology:
- Physics is the foundation of technology. Many technological advancements are based on the principles of physics. For example, the development of electric motors, computers, and telecommunications devices are all based on the principles of electromagnetism, which is a branch of physics.
- Physics provides the theoretical framework for technological innovations. Scientists and engineers use the laws of physics to design and develop new technologies. For example, physicists use quantum mechanics to design new materials with unique properties, which can be used in various technological applications.
- Technology is used to test and verify many theories of physics. Scientists use technological tools like particle accelerators and telescopes to study the properties of matter and the universe. These tools allow physicists to test their theories and develop new ones.
In conclusion, physics and technology are closely related, and advancements in one field often lead to advancements in the other.
The statement that is not correct is option 'B': Physics and technology are not related to each other. This statement is false because physics and technology are closely related to each other. Here are some points to explain the relationship between physics and technology:
- Physics is the foundation of technology. Many technological advancements are based on the principles of physics. For example, the development of electric motors, computers, and telecommunications devices are all based on the principles of electromagnetism, which is a branch of physics.
- Physics provides the theoretical framework for technological innovations. Scientists and engineers use the laws of physics to design and develop new technologies. For example, physicists use quantum mechanics to design new materials with unique properties, which can be used in various technological applications.
- Technology is used to test and verify many theories of physics. Scientists use technological tools like particle accelerators and telescopes to study the properties of matter and the universe. These tools allow physicists to test their theories and develop new ones.
In conclusion, physics and technology are closely related, and advancements in one field often lead to advancements in the other.
The wave nature of electrons is used in which of the following devices?- a)Photocell
- b)Electron microscope
- c)Tokamak
- d)Aeroplane
Correct answer is 'B'. Can you explain this answer?
The wave nature of electrons is used in which of the following devices?
a)
Photocell
b)
Electron microscope
c)
Tokamak
d)
Aeroplane
| | Nandini Patel answered |
Electron microscope uses the wave nature of electrons for its functioning.
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