Physics Classes

Category: 12th Assignments

  • Objective class 12th Book part-1

    Introduction to Objective Physics for Class 12
    “Objective Physics” by Nayan Jha meets the demand for objective questions in Class 12 Physics exams.
    Key Features of This Book:
    Comprehensive Question Types:
    Multiple Choice Questions (MCQs) with answers,
    Assertion–Reason Questions with answers,
    Case Study Based Questions with answers,
    Focus on Conceptual Understanding: Each question enhances students’ conceptual understanding of Physics.
    Problem-Solving Skill Development: The book strengthens students’ ability to solve various Physics problems.
    Detailed Solutions:
    Every question includes a detailed solution.
    Solutions explain the correct answer and underlying Physics principles.
    Target Audience and Benefits:
    This book is for:
    Class 12th Board Examination Preparation: It offers effective preparation for board exams.
    NEET and JEE Aspirants: Concept-based questions benefit students preparing for NEET and JEE.
    How This Book Helps Students:
    Chapter-wise Practice: Chapter-organized questions allow students to assess preparation and identify improvement areas.
    Beyond Memorization: The aim is to foster deeper understanding, helping students understand concepts, learn applications, and build confidence in solving objective questions.
    Author’s Philosophy:
    “Concepts + Practice = Success — Your Success is My Mission.”
    — Nayan Jha
    Physics by Nayan Jha

    To download the complete book (pdf) click here-

  • Alternating current objective questions with answers

    In this blog physics classes by Nayan jha providing objective questions and answers , which contain multiple choice , assertion reason and case study based questions with explanation( complete solution.

    To download the pdf all questions and its answer click here-

    For question numbers 86-100, two statements are given-one labelled Assertion (A) and the other labelled Reason (R).
    Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.
    (a) Both A and R are true and R is the correct explanation of A
    (b) Both A and R are true but R is NOT the correct explanation of A
    (c) A is true but R is false
    (d) A is false and R is also false

    1. Assertion (A) : Long distance transmission
      of A.C. is carried out at extremely high voltage.
      Reason (R): For large distance, voltage has
      to be large….
    2. Assertion (A) : An electric lamp connected
      in series with a variable capacitor and A.C.
      source, its brightness increases with increase
      in capacitance.
      Reason (R): Capacitive reactance decreases
      with increase in capacitance of capacitor.
    3. Assertion (A) : A transformer cannot work
      on D.C. supply.
      Reason (R): D.C. changes neither in magnitude
      nor in direction.
    4. Assertion (A) : Step-down transformer
      increases the current.
      Reason (R): Transformer obeys the law of
      conservation of energy.

    To download complete assignment of these questions and answer (PDF)click here-

  • Most important numerical of electrostatics

    Important numerical of electrostatics  ( Top 12 )

    This assignment contain top 12 important numerical  of electrostatics , chapter 1 and 2 (unit-1). Students preparing for 12th board examination included all states and ICSE board ( even students preparing for JEE/NEET) must solve these numerical.

    1. (i)Two point charges 4Q and Q are separated by 1m in air at what point on the line joining the two charges the electric field intensity is zero. (ii) Two identical metallic sphere A and B having charges +4Q and -10Q are kept at a certain distance apart . A third identical uncharged sphere C is first placed in contact with sphere  A and then with sphere B . Spheres A and B are then brought in contact and then separated . Find the charges on the sphere A and B . 

    To download the complete assignment pdf click here-

    2. (i) Calculate the amount of work done in turning an electric dipole of dipole moment 3×108 C-m from its position of unstable equilibrium to stable equilibrium, in a uniform electric field of intensity 103N/c. (ii)The electric field components due to a charge inside the cube of side 0.1m are shown below      Ex=αx   ,  where α =500N/C-m EY=0,EZ=0

    Calculate (a) The flux through the cube (b)the charge inside the cube

    3.(a) A uniformly charged conducting sphere of 2.5 m in diameter has a surface charge density of 100µC/m2 . Calculate the  (a) charge on the surface  and (b)Total electric flux through the surface. (b)Two large, thin metal plates are parallel and close to each other.  On their inner faces, the plates have surface charges densities of opposite signs and of magnitude 17.0 x 10-22 C/m2.   What is electric field strength E:  (a) in the outer region of the first plate, (b) in the outer region of the second plate, and (c)  between the plates?

    TO DOWNLOAD THE COMLETE ASSIGNMENT CLICK HERE-

  • Assignment current electricity

    This assignment contain all important questions of chapter current electricity.

    1. How does the drift velocity of electrons in a metallic conductor very with increase in temperature ?                               2.The metallic conductor is at a temperature  θ1 .The temperature of the metallic conductor is increased to θ2 How will the product of its resistivity andconductivitychange?                                                                                 3. A cell of e.m.f. 2 V and internal resistance 0.1 Ω is connected to a 3.9 Ω external resistance .What will be the p.d. across the terminals of the cell 4.Nichrome and copper wires of the same length and same radius are connected in series .Current I is passed through them .Why does the nichrome wire get heated first ?                                       5. Sate the condition in witch terminal voltage across a secondary cell is equal to its e.m.f.                                                                 6. Two bulbs whose resistances are in the ratio of 1 ; 2, are connected in parallel to a source of constant voltage . What will be the ratio of power dissipation in these?                                                                                                            7. A toaster produces more heat than a light bulb when connected in parallel to the 220 V mains. Which of the two has greater resistance ?      

    TO DOWNLOAD THE ASSIGNMENT CLICK HERE-

  • Test magnetism and electromagnetic induction

    There are 20 questions in the question paper , in which 14 are objective, (1 marker) and other 6 are subjective which carry 2 marks each .

    This question paper covers the chapter magnetism and electromagnetic induction . It is just for the practice the questions of the chapters magnetism and electromagnetic induction.

    1. Define the term magnetic moment of a current loop . Write the expression for the magnetic moment when an electron revolve at speed v around the   orbit of radius r in hydrogen atom .

     2 .  Define magnetic susceptibility of the materials . Name two elements , one having positive and other having negative susceptibility . what does negative susceptibility signify ?

      3. A bar magnet of magnetic moment M is aligned parallel to the direction of a uniform magnetic field B. What is the work done to turn the magnet, so as the align its magnetic moment  (i) Opposite to the field direction  (ii) Normal to the field direction?

    4. Two circular coils one of small radius r and other of very large radius R are placed coaxially with center coinciding. Obtain the mutual inductance of the arrangement.

    To download the complete question paper click here –

  • Very important numerical of magnetic effect of current

    Very important numerical of magnetic effect of current

    This blog contain very important numerical of magnetic effect of current. There are 10 numerical based on this chapter. It is not necessary that questions will be asked from this blog same as given questions, but these questions will help you to improve your numerical skill . Students preparing for class 12th board exam must solve these questions, i am sure it will help you to improve and sole numerical question of this chapter.

    1. Two wires A and B have the same length equal to 44cm . and carry a current of 10A each . Wire A is bent in circle and B as a square .(a) obtain the magnetic field by both the coils at the center ,(b) which has more field at their centre?

    2. A straight long thick  wire of uniform cross-section ( radius  r=10cm ) carries current 10A through it . Calculate the ratio of magnetic field at a point  r/2 above the surface and a point r/2 below the surface. What is the maximum field due to this current carrying wire?

    To download the 10 very important numerical-ch-4 click hereDownload

  • Practice Test ELECTROSTATICS

    This test paper is useful for the students studying in class 12th.Chapter included in this paper is only electrostatics ( Both chapter-1 and chapter-2 of NCERT).

    .  State Gauss’s law . Using this law derive an expression for the electric field due to a (1) uniformly charged infinite charged plane sheet, (2) charged spherical shell, (3) infinite long charged wire  of linear charge density λ.                                                                                                                                   

     7. S1 and S2 are two hollow concentric spheres enclosing charges Q and 2Q respectively as shown in fig. (1) what is the ratio of electric flux through S1­ and S2 . (2) How will the electric flux through S1 chenges if a medium of dielectric constant  5 is introduced in the space inside S1 in place of air.

    TO DOWNLOAD CLICK HERE

  • NCERT PHYSICS SOLUTION ( CLASS -11th )

    This blog contain class 11th physics NCERT solution , it will help the students to solve all chapters NCERT solution . This blog contain chapter wise solution . This blog also contain the all additional questions , which is not available in current book provided by CBSE . But I considered these questions are important for JEE and NEET .

  • AI or Artificial intelligence

    In this blog we will know what is AI or artificial intelligence ?

    AI or artificial intelligence ,

    It refers to the simulation of human intelligence in machines. These machines are programmed to think , learn , Do  analysis  and take decisions as a man does .

    AI can used in the following forms-

    1. Machine learning (ML) ; In this form machine learn from data given to it and improve it with time without clearly  programmed .

    2.Natural Language Processing (NLP): Enables machines to understand and respond to human language.

    3.Computer Vision: Allows machines to interpret and analyze visual information from the world.

    3. Robotics: Combines AI with physical machines to perform tasks in the real world.

    In short, AI helps machines do tasks that normally require human intelligence, such as recognizing speech, playing games, recommending products, or even driving cars.

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  • Test eletric chargs and fileld

    Test eletric chargs and fileld

    This test paper based on the topic Electric charges and field,(chapter -1 CBSE ). This test paper contains objective, assertion-reason ,case study based questions also, provided by Physics classes by Nayan jha.

    PHYSICS CLASSES BY NAYAN JHA

                                                       Test class 12th

    1.Two small identical sphere having charges +10μC attract each other with a force of F newton. If they are kept in contact and then separated by the same distance, the new force between them is: (a) F/6      (b) 16F      (c) 16F/9        (d) 9F                   

    2.An electric dipole is placed in a non-uniform electric field. Then net:

    • force experienced is zero while torque is not zero
    • force experienced is zero and torque is also zero
    • both force and torque are not zero
    • force experienced is not zero while torque is zero                                     

    3.Electric charges q , q, -2q are placed at the corners of an equilateral triangle ABC of side l. The magnitude of electric dipole moment of the system is:

    • (a)ql            (b) 2ql                      (c) √3ql                      (d) 4ql               

    4.Eight dipoles of charges of magnitude e are placed inside a cube. The total electric flux coming out of the cube will be: (a) 8e/ε0    (b) 16e/ε0   (c) e/ε0     (d) zero            

    5.The ratio of electric fields on the axis and at equator of an electric dipole will be:

    • (a)1 : 1     (b) 2 : 1         (c) 4 : 1        (d) 1 : 4                                

    6.Two point charges exert on each other a force F when they are placed r distance apart in air. When they are placed R distance apart in a medium of dielectric constant K, they exert the same force. The distance R equals: (a)r/√K                            (b) r/K                       (c) rK                        (d) r√K                                                                                                                                         To download the complete test paper click on the link given below-

    TEST-1-CLASS12TH-22-23Download

    To download the another test paper of this chapter click here-

    TEST-2 ELECTROSTATICSDownload

    Test-3-electrostaticsDownload