NCERT Solutions For Class 11 Physics Chapter 1 : Physical World

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NCERT Solutions for Class 11 Physics Chapter 1 Physical World deals with the matters and the materials around the world, where the laws of physics are being applied in nature. The Physical world around us is full of different complex natural phenomena. These are based on some basic physical laws that govern their working in nature. 

The chapter has been omitted from the CBSE Class 11 Physics Syllabus 2022-2023. Class 11 Physics Chapter 1 deals with the scope of physics and technology in society, gravitational force, electromagnetic force, and strong and weak nuclear force. It also covers the nature of physical laws.

Download PDF: NCERT Solutions for Class 11 Physics Chapter 1


NCERT Solutions for Class 11 Physics Chapter 1


Class 11 Physics Chapter 1 – Important Concepts 

  • Physics is a fundamental science that is concerned with understanding the natural phenomena that occur in the universe.
The various branches of Physics include – Mechanics, Thermodynamics, Electromagnetism, and Modem Physics.
  • The scope of Physics covers a magnitude of physical quantities such as mass, length, time, energy, and so on.
Physics deals with the macroscopic world such as the universe and galaxies as well as the microscopic world such as the nucleus of an atom.
  • Gravitational force is the force of attraction between any 2 bodies that is directly proportional to the product of their masses. It is inversely proportional to the square of the distance between them.
\(\begin{array}{l}F\propto \frac{(m_{1}m_{2})}{r^{2}}\end{array}\)
Electromagnetic Force can be either attractive or repulsive.
  • Nuclear force is a force that acts between the neutrons and protons of atoms.

CBSE CLASS XII Related Questions

  • 1.
    If T is the time period of the rotation of the coil, at what values of t in a cycle, the emf generator is maximum ?


      • 2.
        This ‘average velocity’ is found be few mm/s for currents in range of a few amperes. How then is current established almost the instant a circuit is closed ?


          • 3.
            Write two advantages of reflecting telescope over refracting telescope.


              • 4.
                Read the following paragraph and answer the questions that follow.
                A p-type or n-type semiconductor can be converted into a p-n junction by doping it with suitable impurity. The motion of majority charge carriers causes diffusion current across the junction while the barrier electric field causes motion of minority carriers for drift current. In case of unbiased diode, the diffusion and drift currents are equal. This equilibrium is disturbed by the biasing batteries. Diodes, therefore, allow currents in one direction. This property of diode is used in making rectifiers.


                  • 5.
                    An electric field $\vec{E}$ is established across the ends of a cylindrical conductor of length L and area of cross-section A. Discuss how electrons attain an average velocity, independent of time. Hence, obtain a relation between current in the conductor and this ‘average velocity’ of electrons.


                      • 6.
                        Two copper wires having their radii in the ratio of 3 : 2 are connected in series across a battery. Find the ratio of the drift velocities of the electrons in the wires.

                          CBSE CLASS XII Previous Year Papers

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