Tamilnadu Board Physics Question papers for 12th Standard (English Medium) Question paper & Study Materials

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