12th Standard Physics Study material & Free Online Practice Tests - View Model Question Papers with Solutions for Class 12 Session 2019 - 2020
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Physics Question Papers

12th Physics - Electromagnetic waves One Mark Questions with Answer - by Sarojini - Tiruppur - View & Read

  • 1)

    Which of the following electromagnetic radiation is used for viewing objects through fog

  • 2)

    Let E = Eo sin[106 x -ωt] be the electric field of plane electromagnetic wave, the value of ω is

  • 3)

    The electric and magnetic fields of an electromagnetic wave are

  • 4)

    The wavelength range of ultra violet radiation is

  • 5)

    The phase and orientation of the magnetic vector associated with electromagnetic oscillations differ respectively from those of the corresponding electric vectors by

12th Physics - Electromagnetic Induction and Alternating Current One Mark Questions with Answer - by Sarojini - Tiruppur - View & Read

  • 1)

    An electron moves on a straight line path XY as shown in the figure. The coil abcd is adjacent to the path of the electron. What will be the direction of current, if any, induced in the coil?

  • 2)

    Electromagnetic induction is-not used in

  • 3)

    Lenz's law is in accordance with the law of

  • 4)

    Which of the following cannot be stepped up in a transformer?

  • 5)

    If a secondary coil has 40 turns, and a primary coil with 20 turns is charged with 50V of potential difference, then potential difference in secondary would be

12th Physics - Magnetism and Magnetic Effects of Electric Current One Mark Questions with Answer - by Sarojini - Tiruppur - View & Read

  • 1)

    The most suitable metal for permanent magnet is

  • 2)

    Direction of magnetic force on a positive charge moving in a magnetic field is given by

  • 3)

    Lorentz force generally refers to force experienced by a charge due to combined action of

  • 4)

    Two thin long parallel wires separated by a distancea' are carrying current I amp each. The magnitude of the force per unit length excited by one wire on the other is

  • 5)

    At a given place the horizontal component of earth's field is 0.2 x 10-4 Tesla. If a vertical wire carries a current of 30A upward, what is the magnitude and direction of the force on 1m of wire?

12th Physics - Current Electricity One Mark Questions with Answer - by Sarojini - Tiruppur - View & Read

  • 1)

    In a large building, there are 15 bulbs of 40W, 5 bulbs of 100W, 5 fans of 80W and 1 heater of 1kW are connected. The voltage of electric mains is 220V. The minimum capacity of the main fuse of the building will be

  • 2)

    There is a current of 1.0 A in the circuit shown below. What is the resistance of P ?

  • 3)

    The colour code on a carbon resistor is red - red - black. The resistance of the resistor is?

  • 4)

    A square aluminum rod is 1 m long and 5 mm on edge. What must be the radius of another aluminum rod whose length is 1 m and which has the same resistance as that of square Aluminum rod?

  • 5)

    Five 3 resistances are arranged in a polygon (5 sides). What is the resistance between any two corners?

12th Physics - Electrostatics One Marks Question with Answer - by Sarojini - Tiruppur - View & Read

  • 1)

    An isolated metal sphere of radius 'r' is given a charge' q'. The potential energy of the sphere is

  • 2)

    Charge per unit volume is called

  • 3)

    The expression for the electric field due to a surface of total charge 'Q' is given by

  • 4)

    The electric flux is negative, if the angle between \(\overset { \rightarrow }{ dA } \) and \(\overset { \rightarrow }{ E } \) is

  • 5)

    In the given cricuit the effective capacitance between A and B will be

12th Physics - Semiconductor Electronics Five Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    The given circuit has two ideal diodes connected as shown in figure below. Calculate the current flowing through the resistance R1

  • 2)

    Four silicon diodes and a 10 Ω resistor are connected as shown in figure below. Each diode has a resistance of 1Ω. Find the current flows through the 18Ω resistor.

  • 3)

    Assuming VCEsat= 0.2 V and β = 50, find the minimum base current (IB) required to drive the transistor given in the figure to saturation.

  • 4)

    A transistor having a = 0.99 and VBE = 0.7V collector current, is given in the circuit. Find the value of the collector current.

  • 5)

    In the circuit shown in the figure, the BJT has a current gain (β) of 50. For an emitter - base voltage VEB = 600 mV, calculate the emitter - collector voltage VEC (in volts)

12th Physics - Atomic and Nuclear Physics Five Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    Assuming that energy released by the fission of a single \(_{ 92 }^{ 235 }{ U }\) nucleus is 200MeV, calculate the number of fissions per second required to produce 1 watt power.

  • 2)

    Keezhadi (கீழடி), a small hamlet, has become one of the very important archeological places of Tamilandu. It is located in Sivagangai district. A lot of artefacts (gold coins, pottery, beads, iron tools, jewellery and charcoal, etc.) have been unearthed in Keezhadi which have given substantial evidence that an ancient urban civilization had thrived on the banks of river Vaigai. To determine the age of those materials, the charcoal of 200 g sent for carbon dating is given in the following figure(b). The activity of \(_{ 6 }^{ 14 }{ C }\) is found to be 38 decays/s. Calculate the age of charcoal.

    Figure (a) Keezhadi – excavation site

    Figure (b) – Characol which was sent for carbon dating

  • 3)

    Calculate the amount of energy released when 1 kg of \(_{ 92 }^{ 235 }{ U }\) undergoes fission reaction.

  • 4)

    Explain the results of Rutherford α-particle scattering experiment.

  • 5)

    Write the application of alpha decay in smoke detectors.

12th Physics - Dual Nature of Radiation and Matter Five Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    Calculate the energies of the photons associated with the following radiation:
    (i) violet light of 413 nm
    (ii) X-rays of 0.1 nm
    (iii) radio waves of 10 m.

  • 2)

    A 150W lamp emits light of mean wavelength of 5500 A. If the efficiency is 12%, find out the number of photons emitted by the lamp in one second. 

  • 3)

    How many photons of frequency 1014 Hz will make up 19.86 J of energy?

  • 4)

    When a 6000 A light falls on the cathode of a photo cell and produced photoemission. If a stopping potential of 0.8 V is required to stop emission of electron, then determine the
    (i) frequency of the light
    (ii) energy of the incident photon
    (iii) work function of the cathode material
    (iv) threshold frequency and
    (v) net energy of the electron after it leaves the surface.

  • 5)

    A 3310 Å photon liberates an electron from a material with energy 3x10-19 J while another 5000 A photon ejects an electron with energy 0.972x 10-19 J from the same material. Determine' the value of Planck's constant and the threshold wavelength of the material.

12th Physics - Optics Five Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    If the distance D between an object and screen is greater than 4 times the focal length of a convex lens, then there are two positions of the lens for which images are formed on the screen. This method is called conjugate foci method. If d is the distance between the two positions of the lens, obtain the equation for focal length of the convex lens.

  • 2)

    A compound microscope has a magnifying power of 100 when the image is formed at infinity. The objective has a focal length of 0.5 cm and the tube length is 6.5 cm, What is the focal length of the eyepiece.

  • 3)

    Two light sources with amplitudes 5 units and 3 units respectively interfere with each other. Calculate the ratio of maximum and minimum intensities.

  • 4)

    Two light sources of equal amplitudes interfere with each other. Calculate the ratio of maximum and minimum intensities

  • 5)

    A monochromatic light of wavelength 5000 Å passes through a single slit producing diffraction pattern for the central maximum as shown in the figure. Determine the width of the slit.

12th Physics - Semiconductor Electronics Three Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    Explain the formation of PN junction diode. Discuss its V-I characteristics.

  • 2)

    Draw the circuit diagram' of a half wave rectifier and explain its working

  • 3)

    Explain the construction and working of a full wave rectifier.

  • 4)

    Write notes on Photodiode

  • 5)

    Explain the working principle of a solar cell. Mention its applications.

12th Physics - Atomic and Nuclear physics Three Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    Explain the J.J. Thomson experiment to determine the specific charge of electron

  • 2)

    Discuss the Millikan's oil drop experiment to determine the charge of an electron.

  • 3)

    Explain the idea of carbon dating.

  • 4)

    Discuss the process of nuclear fission and its properties.

  • 5)

    Find the
    (i) angular momentum
    (ii) velocity of the electron in the 5th orbit of hydrogen atom.
    (h = 6.6 × 10–34 Js, m = 9.1 × 10–31 kg)

12th Physics - Dual Nature of Radiation and Matter Three Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    What do you mean by electron emission? Explain briefly various methods of electron emission.

  • 2)

    Briefly discuss the observations of Hertz. Hallwachs and Lenard.

  • 3)

    Explain the effect of potential difference on photoelectric current.

  • 4)

    Explain how frequency of incident light varies with stopping potential.

  • 5)

    List out 'the laws of photoelectric effect.

12th Physics - Optics Three Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    Obtain the equation for resultant intensity due to interference of light.

  • 2)

    Explain the Young's double slit experimental setup and obtain the equation for path difference.

  • 3)

    Obtain the equations for constructive and destructive interference for transmitted and reflected waves in thin films.

  • 4)

    Obtain the equation for of microscope.

  • 5)

    Discuss about astronomical telescope.

12th Physics - Semiconductor Electronics Two Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    Define electron motion in a semiconductor.

  • 2)

    Distinguish between Intrinsic and extrinsic semiconductors.

  • 3)

    What do you mean by doping?

  • 4)

    How electron-hole pairs are created in a semiconductor material?

  • 5)

    A diode is called as a unidirectional device. Explain.

12th Physics - Atomic and Nuclear Physics Two Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    What is meant by excitation energy?

  • 2)

    What is distance of dosest approach?

  • 3)

    Define impact parameter.

  • 4)

    Calculate the energy equivalent of 1 atomic mass unit.

  • 5)

    Give the physical meaning of binding energy per nucleon.

12th Physics Dual Nature of Radiation and Matter Two Marks Question - by Sarojini - Tiruppur - View & Read

  • 1)

    Why do metals have a large number of free electrons?

  • 2)

    Define work function of a metal. Give its unit.

  • 3)

    What is photoelectric effect?

  • 4)

    How does photocurrent vary with the intensity of the incident light?

  • 5)

    Give the definition of intensity of light and its unit.

12th Physics - Optics Two Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    What is Snell's window?

  • 2)

    Write a note on optical fibre.

  • 3)

    What are primary focus and secondary focus of convex lens?

  • 4)

    What are the sign conventions followed for lenses?

  • 5)

    What is Rayleigh's scattering?

12th Physics - Recent Developments in Physics One Mark Questions with Answer - by Sarojini - Tiruppur - View & Read

  • 1)

    The particle size of ZnO material is 30 nm. Based on the dimension it is classified as

  • 2)

    Which one of the following is the natural nanomaterial

  • 3)

    The blue print for making ultra durable synthetic material is mimicked from

  • 4)

    The method of making nanomaterial by assembling the atoms is called

  • 5)

    “Sky wax” is an application of nano product in the field of

12th Physics - Semiconductor Electronics One Mark Questions with Answer - by Sarojini - Tiruppur - View & Read

  • 1)

    The barrier potential of a silicon diode is approximately

  • 2)

    Doping a semiconductor results in

  • 3)

    A forward biased diode is treated as

  • 4)

    If a half –wave rectifi ed voltage is fed to a load resistor, which part of a cycle the load current will flow?

  • 5)

    The primary use of a zener diode is

12th Physics - Atomic and Nuclear physics One Mark Questions with Answer - by Sarojini - Tiruppur - View & Read

  • 1)

    Suppose an alpha particle accelerated by a potential of V volt is allowed to collide with a nucleus whose atomic number is Z, then the distance of closest approach of alpha particle to the nucleus is

  • 2)

    In a hydrogen atom, the electron revolving in the fourth orbit, has angular momentum equal to

  • 3)

    mirror of focal length of f and the maximum and minimum distance of

  • 4)

    The ratio between the first three orbits of hydrogen atom is 

  • 5)

    The charge of cathode rays is

12th Physics - Dual Nature of Radiation and Matter One Mark Questions with Answer - by Sarojini - Tiruppur - View & Read

  • 1)

    The wavelength λe of an electron and λp of a photon of same energy E are related by

  • 2)

    In an electron microscope, the electrons are accelerated by a voltage of 14 kV. If the voltage is changed to 224 kV, then the de Broglie wavelength associated with the electrons would

  • 3)

    A particle of mass 3 × 10–6 g has the same wavelength as an electron moving with a velocity 6 10 × 6m s−1. The velocity of the particle is

  • 4)

    When a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2λ, the stopping potential is \(\frac{V}{4}\). The threshold wavelength for the metallic surface is

  • 5)

    If a light of wavelength 330 nm is incident on a metal with work function 3.55 eV, the electrons are emitted. Then the wavelength of the emitted electron is (Take h = 6.6 × 10–34 Js)

12th Physics - Optics One Mark Questions with Answer - by Sarojini - Tiruppur - View & Read

  • 1)

    The speed of light in an isotropic medium depends on,

  • 2)

    A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is,

  • 3)

    An object is placed in front of a convex mirror of focal length of f and the maximum and minimum distance of an object from the mirror such that the image formed is real and magnified.

  • 4)

    For light incident from air on a slab of refractive index 2, the maximum possible angle of refraction is,

  • 5)

    If the velocity and wavelength of light in air is Va and λa and that in water is Vw and λw, then the refractive index of water is,

12th Standard Physics - Recent Developments in Physics Model Question Paper - by Sarojini - Tiruppur - View & Read

  • 1)

    The particle size of ZnO material is 30 nm. Based on the dimension it is classified as

  • 2)

    Which one of the following is the natural nanomaterial

  • 3)

    The blue print for making ultra durable synthetic material is mimicked from

  • 4)

    The method of making nanomaterial by assembling the atoms is called

  • 5)

    “Sky wax” is an application of nano product in the field of

12th Standard Physics - Communication Systems Model Question Paper - by Sarojini - Tiruppur - View & Read

  • 1)

    The output transducer of the communication system converts the radio signal into ________.

  • 2)

    The signal is aff ected by noise in a communication system

  • 3)

    The variation of frequency of carrier wave with respect to the amplitude of the modulating signal is called _______.

  • 4)

    The internationally accepted frequency deviation for the purpose of FM broadcasts

  • 5)

    The frequency range of 3 MHz to 30 MHz is used for

12th Standard Physics - Semiconductor Electronics Model Question Paper - by Sarojini - Tiruppur - View & Read

  • 1)

    The barrier potential of a silicon diode is approximately

  • 2)

    Doping a semiconductor results in

  • 3)

    A forward biased diode is treated as

  • 4)

    If a half –wave rectifi ed voltage is fed to a load resistor, which part of a cycle the load current will flow?

  • 5)

    The primary use of a zener diode is

12th Physics - Atomic and Nuclear Physics Model Question Paper - by Sarojini - Tiruppur - View & Read

  • 1)

    In a hydrogen atom, the electron revolving in the fourth orbit, has angular momentum equal to

  • 2)

    mirror of focal length of f and the maximum and minimum distance of

  • 3)

    the nuclear radius of 27 al is 3.6 fermi, the approximate nuclear radius of 64Cu is

  • 4)

    The nucleus is approximately spherical in shape. Then the surface area of nucleus having mass number A varies as

  • 5)

    Mp denotes the mass of the proton and Mn denotes mass of a neutron. A given nucleus of binding energy B, contains Z protons and N neutrons. The mass M(N,Z) of the nucleus is given by(where c is the speed of light)

12th Physics - Dual Nature of Radiation and Matter Model Question Paper - by Sarojini - Tiruppur - View & Read

  • 1)

    The wavelength λe of an electron and λp of a photon of same energy E are related by

  • 2)

    In an electron microscope, the electrons are accelerated by a voltage of 14 kV. If the voltage is changed to 224 kV, then the de Broglie wavelength associated with the electrons would

  • 3)

    A particle of mass 3 × 10–6 g has the same wavelength as an electron moving with a velocity 6 10 × 6m s−1. The velocity of the particle is

  • 4)

    When a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2λ, the stopping potential is \(\frac{V}{4}\). The threshold wavelength for the metallic surface is

  • 5)

    If a light of wavelength 330 nm is incident on a metal with work function 3.55 eV, the electrons are emitted. Then the wavelength of the emitted electron is (Take h = 6.6 × 10–34 Js)

12th Physics - Optics Model Question Paper - by Sarojini - Tiruppur - View & Read

  • 1)

    For light incident from air on a slab of refractive index 2, the maximum possible angle of refraction is,

  • 2)

    If the velocity and wavelength of light in air is Va and λa and that in water is Vw and λw, then the refractive index of water is,

  • 3)

    When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index,

  • 4)

    The radius of curvature of curved surface at a thin planoconvex lens is 10 cm and the refractive index is 1.5. If the plane surface is silvered, then the focal length will be,

  • 5)

    A plane glass is placed over a various coloured letters (violet, green, yellow, red) The letter which appears to be raised more is,

12th Standard Physics - Term II Model Question Paper - by Pavithra - Karaikkudi - View & Read

  • 1)

    Which charge configuration produces a uniform electric field?

  • 2)

    An electric field \(\vec { E } =10x\hat { i } \) exists in a certain region of space. Then the potential difference V = Vo – VA, where Vo is the potential at the origin and VA is the potential at x = 2 m is:

  • 3)

    Two wires of A and B with circular cross section made up of the same material with equal lengths. Suppose RA = 3 RB, then what is the ratio of radius of wire A to that of B?

  • 4)

    In Joule’s heating law, when I and t are constant, if the H is taken along the y axis and I2 along the x axis, the graph is

  • 5)

    Th ree wires of equal lengths are bent in the form of loops. One of the loops is circle, another is a semi-circle and the third one is a square. Th ey are placed in a uniform magnetic fi eld and same electric current is passed through them. Which of the following loop confi guration will experience greater torque ?

12th Standard Physics - Electromagnetic waves Model Question Paper - by Pavithra - Karaikkudi - View & Read

  • 1)

    The dimension of \(\frac { 1 }{ { \mu }_{ 0 }{ \varepsilon }_{ 0 } } \) is

  • 2)

    Which of the following are false for electromagnetic waves

  • 3)

    Th e electric and the magnetic field, associated with an electromagnetic wave, propagating along X axis can be represented by

  • 4)

    In an electromagnetic wave in free space the rms value of the electric fi eld is 3 V m−1. The peak value of the magnetic field is

  • 5)

    Which of the following is an electromagnetic wave?

12th Standard Physics Practice Question Paper 2019-2020 - by Physics English Medium - New syllabus 2019 - View & Read

  • 1)

    An electric field \(\vec { E } =10x\hat { i } \) exists in a certain region of space. Then the potential difference V = Vo – VA, where Vo is the potential at the origin and VA is the potential at x = 2 m is:

  • 2)

    Rank the electrostatic potential energies for the given system of charges in increasing order.

  • 3)

    An electric dipole is placed at an alignment angle of 300 with an electric fi eld of 2 × 105 NC-1. It experiences a torque equal to 8 N m. Th e charge on the dipole if the dipole length is 1 cm is

  • 4)

    Four Gaussian surfaces are given below with charges inside each Gaussian surface. Rank the electric fl ux through each Gaussian surface in increasing order.

  • 5)

    Two identical point charges of magnitude –q are fi xed as shown in the fi gure below. A third charge +q is placed midway between the two charges at the point P. Suppose this charge +q is displaced a small distance from the point P in the directions indicated by the arrows, in which direction(s) will +q be stable with respect to the displacement

12th Standard Physics - Electromagnetic Induction and Alternating Current Model Question Paper - by Pavithra - Karaikkudi - View & Read

  • 1)

    Th e fl ux linked with a coil at any instant t is given by \(\Phi\)B =10t2−50t+ 250 . The induced emf at t = 3s is

  • 2)

    In a transformer, the number of turns in the primary and the secondary are 410 and 1230 respectively. If the current in primary is 6A, then that in the secondary coil is

  • 3)

    In an electrical circuit, R, L, C and AC voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage and current in the circuit is \(\frac{\pi}{3}\). Instead, if C is removed from the circuit, the phase difference is again  \(\frac{\pi}{3}\).  The power factor of the circuit is

  • 4)

    An inductor 20 mH, a capacitor 50 μF and a resistor 40 Ω are connected in series across a source of emf v = 10 sin 340 t. The power loss in AC circuit is

  • 5)

    \(\frac{20}{\pi^2}H\)inductor is connected to a capacitor of capacitance C. The value of C in order to impart maximum power at 50 Hz is

12th Standard Physics - Magnetism and Magnetic Effects of Electric Current Model Question Paper - by Pavithra - Karaikkudi - View & Read

  • 1)

    A circular coil of radius 5 cm and 50 turns carries a current of 3 ampere. The magnetic dipole moment of the coil is

  • 2)

    A wire of length l carries a current I along the Y direction and magnetic field is given by \(\vec { B } =\frac { \beta }{ \sqrt { 3 } } =(\hat { i } +\hat { j } +\hat { k } )T.\) The magnitude of Lorentz force acting on the wire is

  • 3)

    The vertical component of Earth’s magnetic field at a place is equal to the horizontal component. What is the value of angle of dip at this place?

  • 4)

    The most suitable metal for permanent magnet is

  • 5)

    When current is doubled deflection is also doubled in

12th Standard Physics - Electromagnetic Waves Three Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    The relative magnetic permeability of the medium is 2.5 and the relative electrical permittivity of the medium is 2.25. Compute the refractive index of the medium.

  • 2)

    Write down Maxwell equations in integral form.

  • 3)

    Write down the properties of electromagnetic waves.

  • 4)

    Discuss the source of electromagnetic wave.

  • 5)

    What is emission spectra?. Give their types.

12th Standard Physics - Electromagnetic Induction and Alternating Current Three Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    A cylindrical bar magnet is kept along the axis of a circular solenoid. If the magnet is rotated about its axis, find out whether an electric current is induced in the coil.

  • 2)

    A closed coil of 40 turns and of area 200 cm2, is rotated in a magnetic field of flux density 2 Wb m-2. It rotates from a position where its plane makes an angle of 30o with the field to a position perpendicular to the field in a time 0.2 sec. Find the magnitude of the emf induced in the coil due to its rotation.

  • 3)

    A straight conducting wire is dropped horizontally from a certain height with its length along east – west direction. Will an emf be induced in it? Justify your answer.

  • 4)

    A conducting rod of length 0.5 m falls freely from the top of a building of height 7.2 m at a place in Chennai where the horizontal component of Earth’s magnetic field is 40378.7 nT. If the length of the rod is perpendicular to Earth’s horizontal magnetic field, find the emf induced across the conductor when the rod is about to touch the ground. [Take g = 10 m s-2]

  • 5)

    A copper rod of length l rotates about one of its ends with an angular velocity ω in a magnetic field B as shown in the figure. The plane of rotation is perpendicular to the field. Find the emf induced between the two ends of the rod.

12th Standard Physics - Magnetism and Magnetic Effects of Electric Current Three Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    The repulsive force between two magnetic poles in air is 9 x 10-3 N. If the two poles are equal in strength and are separated by a distance of 10 cm, calculate the pole strength of each pole.

  • 2)

    A short bar magnet has a magnetic moment of 0.5 J T-1. Calculate magnitude and
    direction of the magnetic field produced by the bar magnet which is kept at a distance
    of 0.1 m from the center of the bar magnet along
    (a) axial line of the bar magnet and
    (b) normal bisector of the bar magnet.

  • 3)

    Compute the intensity of magnetisation of the bar magnet whose mass, magnetic moment and density are 200 g, 2 A m2 and 8 g cm-3, respectively.

  • 4)

    Using the relation \(\overset { \rightarrow }{ B } =\mu _{ ° }(\overset { \rightarrow }{ H+ } \overset { \rightarrow }{ M } )\) show that \({ x }_{ m }={ \mu }_{ r }-{ 1 }\)

  • 5)

    The magnetic field shown in the figure is due to the current carrying wire. In which
    direction does the current flow in the wire?.

12th Physics - Current Electricity Three Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    If an electric field of magnitude 570 N C-1, is applied in the copper wire, find the acceleration experienced by the electron.

  • 2)

    A copper wire of cross-sectional area 0.5 mm2 carries a current of 0.2 A. If the free electron density of copper is 8.4 × 1028 m-3 then compute the drift velocity of free electrons.

  • 3)

    A potential difference across 24 Ω resistor is 12 V. What is the current through the resistor?

  • 4)

    Describe the microscopic model of current and obtain general form of Ohm’s law.

  • 5)

    Explain the equivalent resistance of a series and parallel resistor network

12th Physics - Electrostatics Three Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    Calculate the electrostatic force and gravitational force between the proton and the electron in a hydrogen atom. They are separated by a distance of 5.3 × 10-11 m. The magnitude of charges on the electron and proton are 1.6 × 10-19 C. Mass of the electron is me = 9.1 × 10-31 kg and mass of proton is mp = 1.6 × 10-27 kg.

  • 2)

    Consider four equal charges q1,q2, q3 and q4 = q = +1μC located at four different points on a circle of radius 1m, as shown in the figure. Calculate the total force acting on the charge q1 due to all the other charges.

  • 3)

    Obtain the expression for capacitance for a parallel plate capacitor.

  • 4)

    Obtain the expression for energy stored in the parallel plate capacitor.

  • 5)

    Explain in detail the effect of a dielectric placed in a parallel plate capacitor.

12th Physics - Current Electricity Model Question Paper - by Pavithra - Karaikkudi - View & Read

  • 1)

    A toaster operating at 240 V has a resistance of 120 Ω. Th e power is

  • 2)

    Two wires of A and B with circular cross section made up of the same material with equal lengths. Suppose RA = 3 RB, then what is the ratio of radius of wire A to that of B?

  • 3)

    The temperature coefficient of resistance of a wire is 0.00125 per °C. At 300 K, its resistance is 1 Ω. The resistance of the wire will be 2 Ω at

  • 4)

    In Joule’s heating law, when I and t are constant, if the H is taken along the y axis and I2 along the x axis, the graph is

  • 5)

    The temperature co-efficient of resistance for alloys is

12th Standard Physics - Electrostatics Model Question Paper - by Pavithra - Karaikkudi - View & Read

  • 1)

    Which charge configuration produces a uniform electric field?

  • 2)

    An electric dipole is placed at an alignment angle of 300 with an electric fi eld of 2 × 105 NC-1. It experiences a torque equal to 8 N m. Th e charge on the dipole if the dipole length is 1 cm is

  • 3)

    An electric field \(\vec { E } =10x\hat { i } \) exists in a certain region of space. Then the potential difference V = Vo – VA, where Vo is the potential at the origin and VA is the potential at x = 2 m is:

  • 4)

    Two metallic spheres of radii 1 cm and 3 cm are given charges of -1 x 10-2 C and 5 x 10-2 C respectively. If these are connected by a conducting wire, the final charge on the bigger sphere is

  • 5)

    The electrostatic force obeys _______.

12th Physics Quarterly Exam Question Paper 2019 - by Sarojini - Tiruppur - View & Read

12th Physics - Term 1 Model Question Paper - by Pavithra - Karaikkudi - View & Read

  • 1)

    An electric dipole is placed at an alignment angle of 300 with an electric fi eld of 2 × 105 NC-1. It experiences a torque equal to 8 N m. Th e charge on the dipole if the dipole length is 1 cm is

  • 2)

    A parallel plate capacitor stores a charge Q at a voltage V. Suppose the area of the parallel plate capacitor and the distance between the plates are each doubled then which is the quantity that will change?

  • 3)

    A carbon resistor of (47 ± 4.7 ) k Ω to be marked with rings of diff erent colours for its identifi cation. Th e colour code sequence will be

  • 4)

    A non-conducting charged ring of charge q, mass m and radius r is rotated with constant angular speed ω. Find the ratio of its magnetic moment with angular momentum is

  • 5)

    When the current changes from +2A to −2A in 0.05 s, an emf of 8 V is induced in a coil. Th e co-efficient of self-induction of the coil is

12th Physics - Term 1 Five Mark Model Question Paper - by Sarojini - Tiruppur - View & Read

  • 1)

    When two objects are rubbed with each other, approximately a charge of 50 nC can be produced in each object. Calculate the number of electrons that must be transferred to produce this charge.

  • 2)

    Two electric bulbs marked 20 W – 220 V and 100 W – 220 V are connected in series to 440 V supply. Which bulb will be fused?

  • 3)

    What is the value of x when the Wheatstone’s network is balanced?
    P = 500 Ω, Q = 800 Ω, R = x + 400, S = 1000 Ω

  • 4)

    A cell supplies a current of 0.9 A through a 2 Ω resistor and a current of 0.3 A through a 7 Ω resistor. Calculate the internal resistance of the cell.

  • 5)

    In a plane Electromagnetic wave the electric field oscillates sinusoidally at a frequency of 1.5 X 1010Hz & amplitude 36 Vm-1.
    (i) What is the wavelength of a wave?
    (ii) What the amplitude of the oscillating magnetic field?
    (iii) Straight the average energy density of the electric field \(\left( \overrightarrow { E } \right) \) , is equal to average energy density of the magnetic field \(\left( \overrightarrow { B } \right) \)

12th Physics - Electromagnetic Waves Two Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    What is displacement current?

  • 2)

    What are electromagnetic waves?

  • 3)

    Write down the integral form of modified Ampere’s circuital law.

  • 4)

    Explain the concept of intensity of electromagnetic waves.

  • 5)

    What is meant by Fraunhofer lines?

12th Physics - Electromagnetic Induction and Alternating Current Two Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    How is Eddy current produced? How do they flow in a conductor?

  • 2)

    Mention the ways of producing induced emf.

  • 3)

    Give the principle of AC generator.

  • 4)

    List out the advantages of stationary armature-rotating field system of AC generator.

  • 5)

    What do you mean by resonant frequency?

12th Physics - Magnetism and Magnetic Effects of Electric Current Two Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    What is meant by magnetic induction?

  • 2)

    Define magnetic flux.

  • 3)

    What is magnetic susceptibility?

  • 4)

    State Biot-Savart’s law.

  • 5)

    What is meant by hysteresis?

12th Physics - Current Electricity Two Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    What is superconductivity?

  • 2)

    What is electric power and electric energy?

  • 3)

    State Kirchhoff’s voltage rule.

  • 4)

    State the principle of potentiometer.

  • 5)

    What is Peltier effect?

12th Physics Chapter 1 Electrostatics Two Marks Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    What is meant by quantisation of charges?

  • 2)

    Write down Coulomb’s law in vector form and mention what each term represents.

  • 3)

    What is mean by ‘Electric field lines’?

  • 4)

    The electric field lines never intersect Justify.

  • 5)

    What is an equipotential surface?

12th Physics Quarterly Model Question Paper - by Sarojini - Tiruppur - View & Read

  • 1)

    Two identical point charges of magnitude –q are fi xed as shown in the fi gure below. A third charge +q is placed midway between the two charges at the point P. Suppose this charge +q is displaced a small distance from the point P in the directions indicated by the arrows, in which direction(s) will +q be stable with respect to the displacement

  • 2)

    An electric field \(\vec { E } =10x\hat { i } \) exists in a certain region of space. Then the potential difference V = Vo – VA, where Vo is the potential at the origin and VA is the potential at x = 2 m is:

  • 3)

    An uncharged metal sphere is placed between two equal and oppositely charged metal plates. The nature of lines of force will be 

  • 4)

    The magnitude of electric dipole moment of water molecule is

  • 5)

    Which of the following statement on equipotential surface is wrong?

TN 12th Standard Physics Official Model Question Paper 2019 - 2020 - by Sarojini - Tiruppur - View & Read

12th Standard Physics - Electromagnetic waves Book Back Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    What is displacement current?

  • 2)

    What are electromagnetic waves?

  • 3)

    What is meant by Fraunhofer lines?

  • 4)

    The relative magnetic permeability of the medium is 2.5 and the relative electrical permittivity of the medium is 2.25. Compute the refractive index of the medium.

  • 5)

    Discuss briefly the experiment conducted by Hertz to produce and detect electromagnetic spectrum.

12th Standard Physics - Magnetism and Magnetic Effects of Electric Current Book Back Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    Th e force experienced by a particle having mass m and charge q accelerated through a potential diff erence V when it is kept under perpendicular magnetic field \(\vec { B } \) is

  • 2)

    Th ree wires of equal lengths are bent in the form of loops. One of the loops is circle, another is a semi-circle and the third one is a square. Th ey are placed in a uniform magnetic fi eld and same electric current is passed through them. Which of the following loop confi guration will experience greater torque ?

  • 3)

    A non-conducting charged ring of charge q, mass m and radius r is rotated with constant angular speed ω. Find the ratio of its magnetic moment with angular momentum is

  • 4)

    The vertical component of Earth’s magnetic field at a place is equal to the horizontal component. What is the value of angle of dip at this place?

  • 5)

    A simple pendulum with charged bob is oscillating with time period T and let θ be the angular displacement. If the uniform magnetic field i switched ON in a direction perpendicular to the plane of oscillation then

12th Standard Physics - Electromagnetic Induction and Alternating Current Book Back Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    Th e fl ux linked with a coil at any instant t is given by \(\Phi\)B =10t2−50t+ 250 . The induced emf at t = 3s is

  • 2)

    A circular coil with a cross-sectional area of 4 cm2 has 10 turns. It is placed at the centre of a long solenoid that has 15 turns/cm and a cross-sectional area of 10 cm2. The axis of the coil coincides with the axis of the solenoid. What is their mutual inductance?

  • 3)

    An inductor 20 mH, a capacitor 50 μF and a resistor 40 Ω are connected in series across a source of emf v = 10 sin 340 t. The power loss in AC circuit is

  • 4)

    In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor when the energy is stored equally between the electric and magnetic fields is

  • 5)

    \(\frac{20}{\pi^2}H\)inductor is connected to a capacitor of capacitance C. The value of C in order to impart maximum power at 50 Hz is

12th Standard Physics Chapter 2 Current Electricity Book Back Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    A toaster operating at 240 V has a resistance of 120 Ω. Th e power is

  • 2)

    What is the value of resistance of the following resistor?

  • 3)

    In India electricity is supplied for domestic use at 220 V. It is supplied at 110 V in USA. If the resistance of a 60W bulb for use in India is R, the resistance of a 60W bulb for use in USA will be

  • 4)

    The temperature coefficient of resistance of a wire is 0.00125 per °C. At 300 K, its resistance is 1 Ω. The resistance of the wire will be 2 Ω at

  • 5)

    A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of

12th Standard Physics Unit 1 Electrostatics Book Back Questions - by Sarojini - Tiruppur - View & Read

  • 1)

    Two identical point charges of magnitude –q are fi xed as shown in the fi gure below. A third charge +q is placed midway between the two charges at the point P. Suppose this charge +q is displaced a small distance from the point P in the directions indicated by the arrows, in which direction(s) will +q be stable with respect to the displacement

  • 2)

    An electric dipole is placed at an alignment angle of 300 with an electric fi eld of 2 × 105 NC-1. It experiences a torque equal to 8 N m. Th e charge on the dipole if the dipole length is 1 cm is

  • 3)

    The total electric fl ux for the following closed surface which is kept inside water

  • 4)

    Two identical conducting balls having positive charges q1 and q2 are separated by a center to center distance r. If they are made to touch each other and then separated to the same distance, the force between them will be

  • 5)

    Rank the electrostatic potential energies for the given system of charges in increasing order.

12th Standard Physics Chapter 4 Electromagnetic Induction and Alternating Current One Mark Question with Answer Key - by Sarojini - Tiruppur - View & Read

  • 1)

    In a series resonant RLC circuit, the voltage across 100 Ω resistor is 40 V. The resonant frequency ω is 250 rad/s. If the value of C is 4 μF, then the voltage across L is

  • 2)

    An inductor 20 mH, a capacitor 50 μF and a resistor 40 Ω are connected in series across a source of emf v = 10 sin 340 t. The power loss in AC circuit is

  • 3)

    The instantaneous values of alternating current and voltage in a circuit are \(i=\frac { 1 }{ \sqrt { 2 } } sin\left( 100\pi t \right) \) A and v=\(=\frac { 1 }{ \sqrt { 2 } } sin\left( 100\pi t+\frac { \pi }{ 3 } \right) V.\)The average power in watts consumed in the circuit is

  • 4)

    In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor when the energy is stored equally between the electric and magnetic fields is

  • 5)

    \(\frac{20}{\pi^2}H\)inductor is connected to a capacitor of capacitance C. The value of C in order to impart maximum power at 50 Hz is

12th Standard Physics Chapter 3 Magnetism and Magnetic Effects of Electric Current One Mark Question and Answer - by Sarojini - Tiruppur - View & Read

  • 1)

    The BH curve for a ferromagnetic material is shown in the figure. The material is placed inside a long solenoid which contains 1000 turns/cm. The current that should be passed in the solenonid to demagnetize the ferromagnet completely is

  • 2)

    Two short bar magnets have magnetic moments 1.20 Am2 and 1.00 Am2 respectively. They are kept on a horizontal table parallel to each other with their north poles pointing towards the south. They have a common magnetic equator and are separated by a distance of 20.0 cm. The value of the resultant horizontal magnetic induction at the mid-point O of the line joining their centers is (Horizontal components of Earth’s magnetic induction is 3.6 x 10-5 Wb m-2 )

  • 3)

    The vertical component of Earth’s magnetic field at a place is equal to the horizontal component. What is the value of angle of dip at this place?

  • 4)

    A flat dielectric disc of radius R carries an excess charge on its surface. The surface charge density is σ. The disc rotates about an axis perpendicular to its plane passing through the center with angular velocity ω. Find the magnitude of the torque on the disc if it is placed in a uniform magnetic field whose strength is B which is directed perpendicular to the axis of rotation

  • 5)

    A simple pendulum with charged bob is oscillating with time period T and let θ be the angular displacement. If the uniform magnetic field i switched ON in a direction perpendicular to the plane of oscillation then

12th Standard Physics - Current Electricity One Mark Question and Answer - by Sarojini - Tiruppur - View & Read

  • 1)

    A toaster operating at 240 V has a resistance of 120 Ω. Th e power is

  • 2)

    A carbon resistor of (47 ± 4.7 ) k Ω to be marked with rings of diff erent colours for its identifi cation. Th e colour code sequence will be

  • 3)

    When 'n' resistors of equal resistance (R) are connected in series and in parallel respectively,then the ratio of their effective resistance is

  • 4)

    Which of the following has negative temperature coefficient of resistance?

  • 5)

    The temperature co-efficient of resistance for alloys is

12th Standard Physics Unit 1 Electrostatics One Mark Question and Answer - by Sarojini - Tiruppur - View & Read

  • 1)

    An electric dipole is placed at an alignment angle of 300 with an electric fi eld of 2 × 105 NC-1. It experiences a torque equal to 8 N m. Th e charge on the dipole if the dipole length is 1 cm is

  • 2)

    The total electric fl ux for the following closed surface which is kept inside water

  • 3)

    An electric field \(\vec { E } =10x\hat { i } \) exists in a certain region of space. Then the potential difference V = Vo – VA, where Vo is the potential at the origin and VA is the potential at x = 2 m is:

  • 4)

    The value of constant 'K' in coulomb law is

  • 5)

    The electrostatic force is always greater in magnitude than gravitational force for_________ object.

12th Standard Chapter 5 Electromagnetic Waves One Mark Question Paper with Answer - by Sarojini - Tiruppur - View & Read

  • 1)

    Consider an oscillator which has a charged particle and oscillates about its mean position with a frequency of 300 MHz. Th e wavelength of electromagnetic waves produced by this oscillator is

  • 2)

    Th e electric and the magnetic field, associated with an electromagnetic wave, propagating along X axis can be represented by

  • 3)

    In an electromagnetic wave in free space the rms value of the electric fi eld is 3 V m−1. The peak value of the magnetic field is

  • 4)

    Electromagnetic waves are produced by

  • 5)

    Which of the following electromagnetic waves has the highest frequency?

12th Standard Physics Chapter 4 Electromagnetic Induction and Alternating Current One Mark Question with Answer Key - by Sarojini - Tiruppur - View & Read

  • 1)

    Th e fl ux linked with a coil at any instant t is given by \(\Phi\)B =10t2−50t+ 250 . The induced emf at t = 3s is

  • 2)

    When the current changes from +2A to −2A in 0.05 s, an emf of 8 V is induced in a coil. Th e co-efficient of self-induction of the coil is

  • 3)

    A step-down transformer reduces the supply voltage from 220 V to 11 V and increase the current from 6 A to 100 A. Then its efficiency is

  • 4)

    In a series RL circuit, the resistance and inductive reactance are the same. Then the phase difference between the voltage and current in the circuit is

  • 5)

    An inductor 20 mH, a capacitor 50 μF and a resistor 40 Ω are connected in series across a source of emf v = 10 sin 340 t. The power loss in AC circuit is

12th Physics Unit 3 Magnetism and Magnetic Effects of Electric Current One Mark Question with Answer Key - by Sarojini - Tiruppur - View & Read

  • 1)

    A circular coil of radius 5 cm and 50 turns carries a current of 3 ampere. The magnetic dipole moment of the coil is

  • 2)

    A thin insulated wire forms a plane spiral of N = 100 tight turns carrying a current I = 8 m A (milli ampere). The radii of inside and outside turns are a = 50 mm and b = 100 mm respectively.
    The magnetic induction at the center of the spiral is

  • 3)

    A wire of length l carries a current I along the Y direction and magnetic field is given by \(\vec { B } =\frac { \beta }{ \sqrt { 3 } } =(\hat { i } +\hat { j } +\hat { k } )T.\) The magnitude of Lorentz force acting on the wire is

  • 4)

    The vertical component of Earth’s magnetic field at a place is equal to the horizontal component. What is the value of angle of dip at this place?

  • 5)

    When current is doubled deflection is also doubled in

12th Physics Chapter 2 Current Electricity One Mark Question Paper - by Sarojini - Tiruppur - View & Read

  • 1)

    A toaster operating at 240 V has a resistance of 120 Ω. Th e power is

  • 2)

    A carbon resistor of (47 ± 4.7 ) k Ω to be marked with rings of diff erent colours for its identifi cation. Th e colour code sequence will be

  • 3)

    In India electricity is supplied for domestic use at 220 V. It is supplied at 110 V in USA. If the resistance of a 60W bulb for use in India is R, the resistance of a 60W bulb for use in USA will be

  • 4)

    In Joule’s heating law, when I and t are constant, if the H is taken along the y axis and I2 along the x axis, the graph is

  • 5)

    Which of the following has negative temperature coefficient of resistance?

12th Physics Electrostatics One Mark Question Paper - by Sarojini - Tiruppur - View & Read

  • 1)

    Two identical point charges of magnitude –q are fi xed as shown in the fi gure below. A third charge +q is placed midway between the two charges at the point P. Suppose this charge +q is displaced a small distance from the point P in the directions indicated by the arrows, in which direction(s) will +q be stable with respect to the displacement

  • 2)

    Which charge configuration produces a uniform electric field?

  • 3)

    If voltage applied on a capacitor is increased from V to 2V, choose the correct conclusion

  • 4)

    Two metallic spheres of radii 1 cm and 3 cm are given charges of -1 x 10-2 C and 5 x 10-2 C respectively. If these are connected by a conducting wire, the final charge on the bigger sphere is

  • 5)

    Based on Franklin's convention amber rods are_________.

12th Physics Quarterly Exam Model Two Marks Question Paper - by Sarojini - Tiruppur - View & Read

  • 1)

    What is meant by quantisation of charges?

  • 2)

    Give the relation between electric field and electric potential.

  • 3)

    Give a comparison of electrical and gravitional forces?

  • 4)

    The graph shows the variation of volatage 'v' across the plates of two capacitors A & Bversus increase of charge 'Q' stored on them. Which of the two capacitors has higher capacitance?
    Give reason.

  • 5)

    State microscopic form of Ohm’s law.

Plus Two Quarterly Exam Model One Mark Question Paper - by Sarojini - Tiruppur - View & Read

  • 1)

    Which charge configuration produces a uniform electric field?

  • 2)

    An electric field \(\vec { E } =10x\hat { i } \) exists in a certain region of space. Then the potential difference V = Vo – VA, where Vo is the potential at the origin and VA is the potential at x = 2 m is:

  • 3)

    Two points A and B are maintained at a potential of 7 V and -4 V respectively. The work done in moving 50 electrons from A to B is

  • 4)

    In electrostatics if the charges are in motion, another force named __________ comes into play in addition to coulomb force

  • 5)

    The value of constant 'K' in coulomb law is

Plus 2 Physics Chapter 5 Electromagnetic Waves Model Question Paper - by Sarojini - Tiruppur - View & Read

  • 1)

    The dimension of \(\frac { 1 }{ { \mu }_{ 0 }{ \varepsilon }_{ 0 } } \) is

  • 2)

    During the propagation of electromagnetic waves in a medium

  • 3)

    The EM waves do not transport

  • 4)

    Which EM waves are used in medicine to destroy cancer cells?

  • 5)

    A magnetic field is produced by

12th Standard Physics First Mid Term Model Question Paper - by Sarojini - Tiruppur - View & Read

  • 1)

    Four Gaussian surfaces are given below with charges inside each Gaussian surface. Rank the electric fl ux through each Gaussian surface in increasing order.

  • 2)

    The value of constant 'K' in coulomb law is

  • 3)

    For a large charge accumulation, the end of the conductor should have larger curvature that is_________.

  • 4)

    A carbon resistor of (47 ± 4.7 ) k Ω to be marked with rings of diff erent colours for its identifi cation. Th e colour code sequence will be

  • 5)

    Th ree wires of equal lengths are bent in the form of loops. One of the loops is circle, another is a semi-circle and the third one is a square. Th ey are placed in a uniform magnetic fi eld and same electric current is passed through them. Which of the following loop confi guration will experience greater torque ?

11th Standard Physics Chapter 4 Electromagnetic Induction and Alternating Current Important Question Paper - by Sarojini - Tiruppur - View & Read

  • 1)

    Th e fl ux linked with a coil at any instant t is given by \(\Phi\)B =10t2−50t+ 250 . The induced emf at t = 3s is

  • 2)

    When the current changes from +2A to −2A in 0.05 s, an emf of 8 V is induced in a coil. Th e co-efficient of self-induction of the coil is

  • 3)

    A circular coil with a cross-sectional area of 4 cm2 has 10 turns. It is placed at the centre of a long solenoid that has 15 turns/cm and a cross-sectional area of 10 cm2. The axis of the coil coincides with the axis of the solenoid. What is their mutual inductance?

  • 4)

    In a transformer, the number of turns in the primary and the secondary are 410 and 1230 respectively. If the current in primary is 6A, then that in the secondary coil is

  • 5)

    A step-down transformer reduces the supply voltage from 220 V to 11 V and increase the current from 6 A to 100 A. Then its efficiency is

12th Standard Physics Chapter 3 Magnetism and Magnetic Effects of Electric Current Important Question Paper - by Sarojini - Tiruppur - View & Read

  • 1)

    The magnetic fi eld at the center O of the following current loop is 

  • 2)

    A circular coil of radius 5 cm and 50 turns carries a current of 3 ampere. The magnetic dipole moment of the coil is

  • 3)

    A thin insulated wire forms a plane spiral of N = 100 tight turns carrying a current I = 8 m A (milli ampere). The radii of inside and outside turns are a = 50 mm and b = 100 mm respectively.
    The magnetic induction at the center of the spiral is

  • 4)

    Four wires each of length 2m are bent into four loops P, Q, R and S and then suspended into uniform magnetic field as shown in the figure same current is passed in each loop. On which loop the couple will be the highest?

  • 5)

    A current carrying conductor is associated with

12th Physics Unit 2 Model Question Paper - by Sarojini - Tiruppur - View & Read

  • 1)

    A toaster operating at 240 V has a resistance of 120 Ω. Th e power is

  • 2)

    A carbon resistor of (47 ± 4.7 ) k Ω to be marked with rings of diff erent colours for its identifi cation. Th e colour code sequence will be

  • 3)

    Two wires of A and B with circular cross section made up of the same material with equal lengths. Suppose RA = 3 RB, then what is the ratio of radius of wire A to that of B?

  • 4)

    A wire connected to a power supply of 230 V has power dissipation P1. Suppose the wire is cut into two equal pieces and connected parallel to the same power supply. In this case power dissipation is P2. The ratio \(\frac{P_2}{P_1}\) is

  • 5)

    When 'n' resistors of equal resistance (R) are connected in series and in parallel respectively,then the ratio of their effective resistance is

12th Physics - Chapter 1 Electrostatics Important Question Paper - by Sarojini - Tiruppur - View & Read

  • 1)

    Two identical point charges of magnitude –q are fi xed as shown in the fi gure below. A third charge +q is placed midway between the two charges at the point P. Suppose this charge +q is displaced a small distance from the point P in the directions indicated by the arrows, in which direction(s) will +q be stable with respect to the displacement

  • 2)

    An electric dipole is placed at an alignment angle of 300 with an electric fi eld of 2 × 105 NC-1. It experiences a torque equal to 8 N m. Th e charge on the dipole if the dipole length is 1 cm is

  • 3)

    Four Gaussian surfaces are given below with charges inside each Gaussian surface. Rank the electric fl ux through each Gaussian surface in increasing order.

  • 4)

    The total electric fl ux for the following closed surface which is kept inside water

  • 5)

    Two identical conducting balls having positive charges q1 and q2 are separated by a center to center distance r. If they are made to touch each other and then separated to the same distance, the force between them will be

12th Standard Physics Electrostatics Important Question Paper - by Ravikumar - View & Read

  • 1)

    Two identical point charges of magnitude –q are fi xed as shown in the fi gure below. A third charge +q is placed midway between the two charges at the point P. Suppose this charge +q is displaced a small distance from the point P in the directions indicated by the arrows, in which direction(s) will +q be stable with respect to the displacement

  • 2)

    The total electric fl ux for the following closed surface which is kept inside water

  • 3)

    The electrostatic force is always greater in magnitude than gravitational force for_________ object.

  • 4)

    The relative permittivity of water is _______.

  • 5)

    An isolated metal sphere of radius 'r' is given a charge' q'. The potential energy of the sphere is

twelfth standard english medium important multiple choice questions in physics - by Ravikumar - View & Read

  • 1)

    For sharper edge, the ______ is greater. This principle is used in Lightning arrestor

  • 2)

    For continuous charge distributions, _____ methods can be used.

  • 3)

    For a large charge accumulation, the end of the conductor should have larger curvature that is_________.

  • 4)

    Relative permittivity (εr) is also known as ________

  • 5)

    The energy stored per unit volume of space is defined as________.

frequently asked multiple choice questions twelfth standard english medium physics - by Ravikumar - View & Read

  • 1)

    A charge Q is placed at the corner of a cube. The electric flux through all the six faces of the cube is

  • 2)

    Which graph shows the variation of electric field E due to a hollow spherical conductor of radius R as a function of distance from the centre of the sphere?

  • 3)

    In a hollow spherical shell potential (V) changes with respect to distance (r) from centre.
    \(\left[ { V }_{ inside }=\frac { Q }{ 4\pi { \varepsilon }_{ 0 }R } r\le R,\quad { V }_{ outside }=\frac { Q }{ 4\pi { \varepsilon }_{ 0 }r } r\ge R,V\alpha \frac { 1 }{ r } \right] \)

  • 4)

    What physical quantities may X and Y represent? [Y represents the first mentioned quantity].

  • 5)

    During charging a capacitor variation of potential V of the capacitor with time t as shown a

Most important one mark questions physics chapter one - by Ravikumar - View & Read

  • 1)

    If C is the capacitance of an air filled capacitor and C is the capacitance of dielectric filled capacitor, then

  • 2)

    The capacitance of a parallel plate capacitor increases from 5μf of 50μf when a dielectric is filled between the plates. The permitivity of the dielectric is

  • 3)

    An electric dipole placed at an angle in a nonuniform electric field experiences

  • 4)

    Two copper spheres A and B of same size are charged to same potential. A is hollow and B is solid. Which of the two holds more charge?

  • 5)

    A bird sitting an a high power line

Centum multiple choice questions Chepter one Physics - by Ravikumar - View & Read

  • 1)

    The expression for the electric field due to a surface of total charge 'Q' is given by

  • 2)

    The dipole is called point dipole when the distance

  • 3)

    The magnitude of torque on dipole is maximum if

  • 4)

    The magnitude of electric dipole moment of water molecule is

  • 5)

    The expression for electric potentid difference is

New syllabus creative multiple choice questions physics - by Ravikumar - View & Read

  • 1)

    The figure shows tow parallel equipotential surface A and B kept at a small distance 'r' a part from each other. A point change of Q coulomb is taken from the surface A to B. The amount of net work done will be 

  • 2)

    The given figure is a plot of lines of force due to two charges q1 & q2 find out the sign of charges

  • 3)

    An uncharged metal sphere is placed between two equal and oppositely charged metal plates. The nature of lines of force will be 

  • 4)

    An isolated metal sphere of radius 'r' is given a charge' q'. The potential energy of the sphere is

  • 5)

    In a hydrogen atom the electron revolves around the proton in an orbit of 0.53 \(\mathring { A } \). The potential produced by the electron on the nuleus is

Physics chapter one new syllabus Important one mark questions - by Ravikumar - View & Read

  • 1)

    Two identical point charges of magnitude –q are fi xed as shown in the fi gure below. A third charge +q is placed midway between the two charges at the point P. Suppose this charge +q is displaced a small distance from the point P in the directions indicated by the arrows, in which direction(s) will +q be stable with respect to the displacement

  • 2)

    Which charge configuration produces a uniform electric field?

  • 3)

    An electric dipole is placed at an alignment angle of 300 with an electric fi eld of 2 × 105 NC-1. It experiences a torque equal to 8 N m. Th e charge on the dipole if the dipole length is 1 cm is

  • 4)

    Four Gaussian surfaces are given below with charges inside each Gaussian surface. Rank the electric fl ux through each Gaussian surface in increasing order.

  • 5)

    Two identical conducting balls having positive charges q1 and q2 are separated by a center to center distance r. If they are made to touch each other and then separated to the same distance, the force between them will be

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TN Stateboard Education Study Materials

TN Stateboard Updated Class 12th Physics Syllabus

Electrostatics

Introduction - Coulomb's Law - Electric Field and Electric Field Lines - Electric dipole and Its Properties - Electrostatic Potential and Potential Energy - Gauss Law and Its Applications - Electrostatics of Conductors and Dielectrics - Capacitors and Capacitance - Distribution of Charges In A Conductor and Action At Points

Current Electricity

Introduction - Electric Current - Ohm’s Law - Energy and Power In Electrical Circuits - Electric Cells and Batteries - Kirchhoff ’s Law - Heating Effect of Electric Current - Thermoelectric Current

Magnetism and magnetic effects of electric current

Introduction of Magnetism - Coulomb's Inverse Square Law of Magnetism - Torque Acting On a Bar Magnet In Uniform Magnetic Field - Magnetic Properties - Classification of Magnetic Materials - Hysteresis - Magnetic Effects of Current - Biot - Savart Law - Ampere’s Circuital Law - Lorentz Force - Torque On a Current Loop

Electromagnetic Induction And Alternating Current

Introduction - Electromagnetic Induction - Eddy currents - Self-Induction - Methods of Producing Induced EMF - AC Generator - Transformer - Alternating Current - Power
In AC Circuits - Oscillations In LC Circuits

Electromagnetic waves

Introduction - Electromagnetic Waves - Types of Spectrum-Emission and Absorption Spectrum-Fraunhofer Lines

TN StateboardStudy Material - Sample Question Papers with Solutions for Class 12 Session 2019 - 2020

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