Physics Classes

Author: Nayan Jha

  • 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 NEET /JEE Chapter 1 -4 (class 11th)

    ( chapter 1 -4 class 11th)

    There are 20 questions in this question paper. Students have to solve it in 25 minutes only .

    Test NEET/JEE (ch-1,2,3,4)

    1. A  new system of units is proposed in which unit of mass is A kg . unit of length is B kg and unit of time is C s , What will be the value of 5 j in new system?

    (a) 5AB2C-2 (b) 5A-1B-2C2 (c) 5 A-2 B-1 C-2 (d) 5 A-1 B-1 C2

    2. If linear momentum P , area A and  time t is taken as fundamental units then the dimensional formula of  energy is (a) P1 A-1 t-1  (b) P2 A1 t1   (c) P1 A-1/2 t1   (d) P1 A1/2 t-1.

    3.  If E , m,L  and G denotes energy , mass , length and gravitational constant then the ( EL2 /m5G2) has the dimension of   (a) mass (b) length (c) time (d) angle.

    4. The period of oscillation of time period T is 2π(l/g)1/2 measured value of l is 10 cm is known as 1mm accuracy ant time for 100 0scillations of the pendulum is found to be 50 s using a wrist watch of 1s resolution . What is the accuracy in the measurement of g ?

    (a)2% (b) 3% (c) 4% (d) 5% .

    5. Two resistors of resistance R1=100+-3 Ohm R2=200+-4 Ohm then the equivalent resistance of parallel combination is (a) 66.7 +-1.8  (b) 66.7+- 4  (c) 66.7+-3  (d)66.7+-7 Ohm.

    6. A cube has a side of length 1.2 x 10-2 its volume upto correct significant figure is (a) 1.7×10 -6 (b) 1.73×10 -6 (c) 1.78×10 -6(d) 1.732×10 -6.

    7. T he position of the object moving along x-axis is given by x= a+bt2, where a=8.5 b=2.5 and t is measured in seconds. The average velocity of the object between t=2s to t=4 s  in m/s  is (a) 5 (b) 10 (c) 15 (d) 20 .

    8. A player throw a ball vertically upwards with velocity u at highest pint , (a) both velocity and acceleration are zero (b) The velocity of the ball is u and acceleration is zero (c)The velocity of the ball is 0 but acceleration is g (d) the velocity of the ball is u and acceleration is g .

    9. If a lift is moving upward with velocity 5m/s a girl throw a ball upward with speed 50m/s the ball will returns on her hand in time (a)5s (b)10s (c) 15s (d) 20s.

    10. A boy sliding on the smooth inclined plane requires 4 s to reach on the ground starting from rest from the top . How much time will it take to cover one fourth the distance starting from rest at the top?

    (a) 1s (b) 4s (c)2s (d)16s .

    11. A particle is released from rest from a tower of height 3h . the ratio of the intervals of time to cover three equal heights h is (a) t1:t2: t3 = 3:2:1 (b) t1:t2: t3 =1: (√2-1)(:√3-2) (c) t1:t2: t3 =√3:√2:1 (d) t1:t2: t3 = 1:√2-1): (√3-√2).

    12. A ball A is thrown upward  with velocity u  at the same time another ball B is released from rest at height H,  at time t the speed of A relative to B is (a) u (b) u-2gt (c) (u2-2gh)1/2 (d)u-gt.

    13. A vehicle travel half the distance L with speed V1 and other half with speed V2 then its average speed is , (a) (V1 + V2)/2 (B) (2V1+V2)/V1+ V2 (C) 2V1V2/V1+V2 (D) L(V1+ V2)/V1V2 .

    14. Two vectors    and A+B = C then A and B are (a) parallel (b) perpendicular (c) anti-parallel (d) null vector.

    15. If resultant of two equal vectors is equal to the either forces Then the angle between these two vectors is ,(a) 900 (b) 1200 (c) 600 (d) 300

    16. if dot product  of two vectors   is null vector then the angle between these two vectors is   (a) 0 (b) 1200 (c) 900 (d) 450 .

    17. If  then  then which of the following statement is  correct ( a) vector A is perpendicular to  vector B (b) vector A is parallel to vector C (c) vector b is parallel to vector C (D) vector A is perpendicular to vector C .

    18.Two vectors  magnitude of A,B and C are 3,5,4 respectively then  (a)the angle between A and B is 900 . angle between A and C is 900. (c) angle between B and C is 900(d) angle between A and B is 00.

    19. If unit vector of a vector is represented as 0.5  – 0. 8  +c  then the value of c is (a) √0.01  (b) √0.11  (c) √0.39 (d)  1.

    20. The component of a vector A is along X-axis will have maximum value if (a)vector A is along positive Y axis   (b)vector A along positive x-axis  (c) vector A makes angle 450 with the x-axis  (d) A is along negative X aixis.

  • Test solid, liquid and gases incluting thermal properties of matter

     Solids, liquid and thermal properties of matter.

    1. The maximum load a wire can withstand without breaking, when its length is reduced to half of its length, will (i) be doubled (ii) be half (iii) be four times (iv) remain same .                                                           2. If length of a wire is doubled and area is halved then its young modulus will be (i) same (ii) halved (iii) four times (iv) ¼ times.                                                                                                                                                            3.The two ends of the wire maintained at temp. 100 and 1100c the rate of flow of heat is 4j/s . if the temp. of the ends are 200 and 2100c then the rate of flow of heat will be (i) 16.8 (ii)8.0 (iii)4.0 (iv) 44.8 j/s.                                                                                                                                                                                                      4. An ideal liquid flows through a tube having diameters 2.5 and 3.75 cm then the ratio of velocity of liquid through these cross-section is (i)9:4 (ii)3:2 (iii) (3/2)1/2.(iv) (2/3)1/2                                                                              5. If volume of a system is doubled without changing its temp then volume will be (i) doubled (ii) same (iv) four times (iv) halved.                                                                                                                                                              6. Two moles of helium gas undergo a cyclic process as shown in fig. assuming the gas to be ideal calculate the following quantities in the prosses (a) the net work done (b) the net change in internal energy (c) the net change heat energy. (R=8.32j/mole)

    To download complete question paper click here–

  • Test paper Class-11 (Physics)

    This is the first test paper provided for the students of class-11th ( Physics) . in the end of the paper answer is given . Students having solved the question paper , may check its answers.

    This question paper is taken by the other books, if students get any errors , then sorry for this.

    Test-1st-11th-Download

    solution-test-1-11thDownload

  • How to select coaching center for JEE and NEET

    Physics classes by Nayan jha provoding information ,How to select coaching centre for NEET and JEE

    Students/parents as you know these days most of the parent or students are looking to settle their child as quick as possible. And IIT (Indian institute of technology) and medical colleges like AIIMS play the great role to do so.

    As we know every student who appears for the 10th class exams has one big question about his life that which stream to select for further education. Once the decision for the stream is made, which is Science. Then next question is   medicine or engineering? The answer to this question marks the beginning of a dream career. Students can decide this based on what subject interests them. If students scores good  in NEET leads to admission to a good medical college, whereas a good score in IIT JEE will help students get admission to a reputed engineering college.

    Both the exams are national-level entrance exams and hold a lot of importance concerning students’ higher education. One more doubt that arises when deciding between the two is which exam is easier to crack. Now, and for this selection of good coaching center is required to score good marks to take the admission in reputed colleges, every student who appears for the 10th class exams has one question about which stream to select for further education. Once the decision for the stream is made, the stream is Science. The question that comes next is medicine or engineering? The answer to this question marks the beginning of a dream career. Students can decide this based on what subject interests them. A good score in NEET leads to admission to a good medical college, whereas a good score in IIT JEE will help students get admission to a reputed engineering college.

    Both the exams are national-level entrance exams and hold a lot of importance concerning students’ higher education. One more doubt that arises when and where should we join the coaching center or tuitions . Here is the answer – You just watch the video given below-

  • 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

  • Very important numericals physics( term-2)

    Important numericals physics term-2 (CBSE)

    1. What is apparent position of the object below a rectangular block of glass 6cm thick , if a layer of water 4cm thick is on the top of the glass ? Refractive index of glass and water with respect to air is 3/2 and 4/3 respectively.
    2. A screen is placed 100cm from an object  . The image of the object on the screen is formed by a convex lens at two different locations , separated by distance 20cm . calculate the focal length of the lens used.
    3. You are given three lenses  L1 , L2,L3 each of focal length 10cm . an object is kept at 15cm in front of L1  ,  as shown in fig. the final image is formed at the focus of L3 find the separation between the lenses.
    • 4. A convex lens made up of glass of refractive index 1.5 is  dipped  , in turn ,in (a) a medium of refractive index 1.65 (b)   ) a medium of refractive index 1.33.Will it behave like converging or diverging lens in two cases, explain how focal length changes in two cases .
    • 5.Three rays  red  , green and blue are incident on a right angled prism ABC at face AB the refractive indices of the material  of the prism for red, green ,and blue are 1.39,1.44, and 1.47 respectively . Out of the three which colour of ray emerge out of face AC. Trace the path of the three rays after passing through AB.
    • 6. State the conditions under which total internal reflection occurs . one face of a prism with a refracting angle of 30 , is coated with silver . A ray incident on  another face at an angle of 45 is refracted and reflected from the silver coated face and retrace its path. Find the refractive index of the material of the prism.
    • 7. Find the position of the image formed by the lens combination given in figure   
    • 8. A diverging lens of focal length f cut into two identical parts ,each forming a plano- convex lens what is the focal length of each part. How the focal length of the lens changes if it bisected axially?
    • 9. The image of a needle placed 45cm from a lens is formed on a screen placed 90 cm on the other side of lens. Find displacement of image if object is moved 5cm away from lens.
    • 10. A small bulb is placed at  the bottom of a tank containing water to a depth of 80 cm . what is the area of the surface of water through which light of the bulb can emerge out ?Refractive index of water is 1.33 consider the bulb to be a point source.
    •  11. Yellow light of wavelength λ= 6000 A illuminate a single slit of width 1 x 10-4 m calculate (i) the distance between two dark lines on either side of the central maximum when the diffraction pattern is on screen kept 1.5 m away from the slits , (ii) the angular spread of the first diffraction minima .

       Ans- 1.8 cm , 6x 10-3 rad . 12. Two wavelength of sodium light 590 nm are used in turn , to study the diffraction taking place at the single slit of aperture  2x 10-4 m . The distance between the slits and the screen is 1.5 m . Calculate the separation between the position of first maxima of the diffraction pattern obtained in the two cases .

      Ans-6.75×10-5m . 13. (a) In a single slit diffraction , a slit of width d is illuminated by red light of wavelength 650 nm . For what value of  d will (i) the first minimum fall at an angle of diffraction of 300 , and   (ii) the first maximum fall at an angle of diffraction of 300 ? 

      (b) Why does the intensity of secondary maximum becomes less as compared to the central maximum .

         Ans- 1.3 x10-6 m , 1.95×10 ‑6‑ m 14. A monochromatic light of wavelength 500 nm is incident normally on a single slit of width 0.2 mm to produce a diffraction pattern . Find the angular width of the central maximum obtained on the screen . Also estimate the number of fringes obtained in YDSE with fringe width 0.5 mm , which can be accommodate within the region of total angular spread of the central maximum due to single slit .            Ans- ϴ=0 to 2.5×10-3 ; n=D/2 ;D+1 15.A beam of light consisting of two wavelength 800nm and 600 nm is used to obtain the interference pattern in YDSE on a screen placed 1.4 m away . If the two slits are separated by 0.28mm , calculate the least distance from the central bright maximum where the bright fringes of the two wavelengths coincide . Ans- n=3 ; 1.2 cm . 16. In YDSE using monochromatic light of wavelength λ, the intensity of light at a point on the screen where path difference is λ is K units . Find out the intensity of light of light at a point where path- difference is λ/3 . 17. The ratio of the intensity at minima to the maxima in YDSE is 9:25 , find the ratio of the width of the two slits , also find the ratio of amplitude .   Ans- 16:1 . 18. Two wavelength of sodium light of 590 nm and 596 nm are used in turn to study the diffraction taking place at a single slit of aperture 2×10-6 m . The distance between the slit and the screen is 1.5 m . Calculate separation between the position of first maxima and of the diffraction pattern obtained in the two cases .

     Ans- 6.75 nm .

    19. The electron in a given Bohr orbit has a total energy of -1.5Ev. calculate its(i) kinetic energy(ii)potential energy (iii) wavelength of the radiation emitted , when this electron makes a transition to the ground state.

    20. The energy of an electron in the ground state of hydrogen atom is -13.6 Ev. (i) what does the negative sign signify ? (ii)how much energy is required to take an electron in this atom from the ground state to the first exited state?

    21. The ground state energy of hydrogen atom is  -13.6 eV.  ( I ) What is the potential energy of an electron in the third exited state? (ii) what will be the maximum and minimum wavelength of the emitted  radiation of Lyman series of hydrogen spectrum.

    22. The energy level diagram  of an element is given below . identify using necessary calculations , which transition corresponds to the emission of the spectral line of wavelength 102.7 nm . which transition corresponds to the emission of radiation of maximum wavelength?  

    .

    23.The first line of Lyman series in hydrogen spectrum has a wavelength of 1220 Å. Calculate the wavelength of the second member of the series.

    24. A nucleus at rest splits up into two parts with velocity ratio 2 : 1 calculate the ratio of their radii of the ratio the two nuclear fragments.

    25.The ground state energy of electron in hydrogen atom is – 13.6 eV. Find the kinetic energy and potential energy of the electron in (i) ground state (ii) first excited state.