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Physical World

Physical World

Edited By Team Careers360 | Updated on May 06, 2022 09:17 AM IST

The term Physics comes from a Greek word that means "nature." Bhautiki is the Sanskrit equivalent of English Physics, and it refers to the study of the physical world. In Physics, The definition of physical world in a wide sense is the study of nature's fundamental laws and their expression. Physical World is a chapter that covers the fundamentals of science, mathematics, natural sciences, forces, physics, and their influence and applications. The physical world class 11 ncert provides pupils with a rudimentary understanding of the history and the evolution of physical rules also for Hindi language physical world in hindi notes can be referred.

List of topics according to Physical World NCERT and JEE Main/Physical World NEET syllabus:

  1. Work, Energy, and Power

  2. Thermal Properties of Matter

  3. Rotational Motion

  4. Thermodynamics

  5. Kinetic Theory

  6. Gravitation

  7. Laws of Motion

  8. Waves

Important concepts and Laws:

  • Physics-scope and excitement;
  • Nature of physical laws;
  • Physics,
  • technology and society. (To be discussed as a part of Introduction and integrated with other topics)
  • Need for measurement:
  • Units of measurement;
  • Systems of units;
  • SI units,
  • Fundamental and derived units.
  • Length, mass and time measurements
  • Accuracy and precision of measuring instruments;
  • Errors in measurement;
  • Significant figures.
  • Dimensions of physical quantities
  • Dimensional analysis and its applications

Importance of Physical world class 11:

Physics is the study of fundamental principles and rules of nature, as well as applied forces and the matter that surrounds us. In physics, there are numerous explanations. As a result, students must prepare thoroughly and learn each idea. In competitive exams, physics is given equal weight. Physical World is a chapter that covers the fundamentals of science, mathematics, natural sciences, forces, physics, and their influence and applications. The notes for Physics Class 11 Chapter 1 contain all of the major subjects stated. It provides pupils with a rudimentary understanding of the history and the evolution of physical rules.

In the NEET Exam, there are two elements to the physical world:

  1. THE WORLD OF PHYSICAL EXPERIENCE

  2. MEASUREMENTS AND UNITS

NCERT Solutions Subject wise link:

NCERT Exemplar Solutions Subject wise link:

NCERT Notes Subject Wise Link:

Frequently Asked Question (FAQs)

1. What are Fundamental Forces in the Nature of the Physical World?

The fundamental forces in nature that govern a wide range of macroscopic and microscopic events are described below.

The force that pulls an object towards the earth is known as gravitational force.

Strong Nuclear Force - This is the force that every item generates, repels, or attracts.

The electromagnetic force is the force that binds electrons and protons to the atom's nucleus.

The weak nuclear force is the force that isn't strong enough to hold an element's electrons and protons together. It only emerges in the -decay of the nucleus, as well.

Towards Force Unification - This category explains how scientists are divided into multiple natural forces inside a single force.

2. Conservation Laws in Physics?

In a process known as conserved quantities, the physical quantities remain unchanged. The rules of conservation of mass, energy, angular momentum, linear momentum, charge, parity, and others are among the general conservation laws found in nature. However, some conservation laws apply to one fundamental force but not to others. These conservation laws are inextricably linked to nature's symmetry. Space and temporal symmetry, as well as other types of symmetry, play an important part in contemporary theories of fundamental forces in nature.

3. Technological Applications of Physics

Physics and its concepts have led to a number of small and big discoveries in the twenty-first century. It's also mind-boggling to consider how much work has been done in the field of Physics. The following are a few examples of how physics has aided in the discovery or invention of new things.

The steam engine, a prominent invention during the Industrial Revolution, was invented in England in the 19th century.

Physics, on occasion, is the source of new technology. Consider the evolution of Wireless Communication Technology, which adhered to the fundamental rules of magnetism and electricity.

In 1938, Meitner and Hahn discovered the phenomenon of neutron-induced fission of Uranium, which led to the development of weapons and nuclear reactors.

Another significant discovery is the use of simple physics laws to convert wind, solar, and geothermal energy to electricity.

4. What is Classical Physics and what subjects It Deal with?

Mechanics - We study Newton's laws of motion under mechanics.

Electrodynamics - It deals with the magnetic and electric phenomena associated with the magnetic and charged bodies.

Thermodynamics - It deals with the macroscopic equilibrium systems and is concerned with internal energy changes, entropy, temperature, and more, of the system via the transfer of heat and external work. The efficiency of heat engines and refrigerators and more.

Optics - The study of phenomena connected with light and optical instruments such as microscopes, telescopes, and more related things.

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Articles

Get answers from students and experts

 5 g of Na2SO4 was dissolved in x g of H2O. The change in freezing point was found to be 3.820C.  If Na2SO4 is 81.5% ionised, the value of x (Kf for water=1.860C kg mol−1) is approximately : (molar mass of S=32 g mol−1 and that of Na=23 g mol−1)
Option: 1  15 g
Option: 2  25 g
Option: 3  45 g
Option: 4  65 g  
 

 50 mL of 0.2 M ammonia solution is treated with 25 mL of 0.2 M HCl.  If pKb of ammonia solution is 4.75, the pH of the mixture will be :
Option: 1 3.75
Option: 2 4.75
Option: 3 8.25
Option: 4 9.25
 

CH_3-CH=CH-CH_3+Br_2\overset{CCl_4}{\rightarrow}A

What is A?

Option: 1

CH_3-CH(Br)-CH_2-CH_3


Option: 2

CH_3-CH(Br)-CH(Br)-CH_3


Option: 3

CH_3-CH_2-CH_2-CH_2Br


Option: 4

None


\mathrm{NaNO_{3}} when heated gives a white solid A and two gases B and C. B and C are two important atmospheric gases. What is A, B and C ?

Option: 1

\mathrm{A}: \mathrm{NaNO}_2 \mathrm{~B}: \mathrm{O}_2 \mathrm{C}: \mathrm{N}_2


Option: 2

A: \mathrm{Na}_2 \mathrm{OB}: \mathrm{O}_2 \mathrm{C}: \mathrm{N}_2


Option: 3

A: \mathrm{NaNO}_2 \mathrm{~B}: \mathrm{O}_2 \mathrm{C}: \mathrm{Cl}_2


Option: 4

\mathrm{A}: \mathrm{Na}_2 \mathrm{OB}: \mathrm{O}_2 \mathrm{C}: \mathrm{Cl}_2


C_1+2 C_2+3 C_3+\ldots .n C_n=

Option: 1

2^n


Option: 2

\text { n. } 2^n


Option: 3

\text { n. } 2^{n-1}


Option: 4

n \cdot 2^{n+1}


 

A capacitor is made of two square plates each of side 'a' making a very small angle \alpha between them, as shown in the figure. The capacitance will be close to : 
Option: 1 \frac{\epsilon _{0}a^{2}}{d}\left ( 1 - \frac{\alpha a }{4 d } \right )

Option: 2 \frac{\epsilon _{0}a^{2}}{d}\left ( 1 + \frac{\alpha a }{4 d } \right )

Option: 3 \frac{\epsilon _{0}a^{2}}{d}\left ( 1 - \frac{\alpha a }{2 d } \right )

Option: 4 \frac{\epsilon _{0}a^{2}}{d}\left ( 1 - \frac{3 \alpha a }{2 d } \right )
 

 Among the following compounds, the increasing order of their basic strength is
Option: 1  (I) < (II) < (IV) < (III)
Option: 2  (I) < (II) < (III) < (IV)
Option: 3  (II) < (I) < (IV) < (III)
Option: 4  (II) < (I) < (III) < (IV)
 

 An ideal gas undergoes a quasi static, reversible process in which its molar heat capacity C remains constant.  If during  this process the relation of pressure P and volume V is given by PVn=constant,  then n is given by (Here CP and CV are molar specific heat at constant pressure and constant volume, respectively)
Option: 1  n=\frac{C_{p}}{C_{v}}


Option: 2  n=\frac{C-C_{p}}{C-C_{v}}


Option: 3 n=\frac{C_{p}-C}{C-C_{v}}

Option: 4  n=\frac{C-C_{v}}{C-C_{p}}
 

As shown in the figure, a battery of emf \epsilon is connected to an inductor L and resistance R in series. The switch is closed at t = 0. The total charge that flows from the battery, between t = 0 and t = tc (tc is the time constant of the circuit ) is : 


Option: 1 \frac{\epsilon L }{R^{2}} \left ( 1 - \frac{1}{e} \right )
Option: 2 \frac{\epsilon L }{R^{2}}


Option: 3 \frac{\epsilon R }{eL^{2}}

Option: 4 \frac{\epsilon L }{eR^{2}}
 

As shown in the figure, a particle of mass 10 kg is placed at a point A. When the particle is slightly displaced to its right, it starts moving and reaches the point B. The speed  of the particle at B is x m/s. (Take g = 10 m/s2 ) The value of 'x' to the nearest is ___________.
Option: 1 10
Option: 2 20
Option: 3 40
Option: 4 15

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