List of top Physics Questions asked in Maharashtra Board Class XII Exam

What is value of B called, when H = 0 is in the hysteresis loop?
Calculate the electric field intensity at a point just near the surface of a charged plane sheet, measured from its mid-point. [ \( \sigma = 8.85 \, \mu C/m^2 \) ]
Define self inductance.
Using Newton's law of viscosity for streamline flow, derive an expression for coefficient of viscosity.
Draw a neat and labelled circuit diagram for a full wave rectifier.
Obtain an expression for average power dissipated in a series LCR circuit.
"If two systems are each in thermal equilibrium with a third system, they are also in thermal equilibrium with each other." This statement refers to :
What is Brewster's law? Derive the formula for Brewster's angle.
State and prove the law of conservation of angular momentum.
State and prove Kirchhoff's law of heat radiation.
At what temperature the surface tension of a liquid becomes zero?
State any four uses of Van de Graaff generator. In a parallel plate air capacitor, intensity of electric field is changing at the rate of \(2 \times 10^{11}\) V/ms. If area of each plate is 20 cm\(^2\), calculate the displacement current.
The power rating of a ceiling fan rotating with a constant torque of 2 Nm with an angular speed of 2\(\pi\) rad/s will be ............
State the formula for magnetic induction produced by a current in a circular arc of a wire. Hence find the magnetic induction at the centre of a current carrying circular loop.
Which of the following materials belongs to diathermanous substance?
What is Ferromagnetism? Explain it on the basis of domain theory.
Distinguish between interference and diffraction of light. A double slit arrangement produces interference fringes for sodium light of wavelength 589 nm, that are 0.20 degree apart. What is the angular fringe separation if the entire arrangement is immersed in water? (R.I. of water = 1.33)
A galvanometer has a resistance of 50 \(\Omega\) and a current of 2 mA is needed for its full scale deflection. Calculate resistance required to convert it. (i) into an ammeter of 0.5 A range. (ii) into a voltmeter of 10 V range.
State Einstein's photoelectric equation and mention physical significance of each term involved in it. The wavelength of incident light is 4000Å. Calculate the energy of incident photon.
Diameter of a water drop is 0.6 mm. Calculate the pressure inside a liquid drop. (T = 72 dyne/cm, atmospheric pressure = \(1.013 \times 10^5\) N/m\(^2\))
A solenoid of length \(\pi\) m and 5 cm in diameter has a winding of 1000 turns and carries a current of 5A. Calculate the magnetic field at its centre along the axis.
Derive an expression for law of radioactive decay. Define one becquerel (Bq).
In a thermodynamic system, define -- (a) Mechanical equilibrium (b) Chemical equilibrium and (c) Thermal equilibrium
A conducting bar is rotating with constant angular speed around a pivot at one end in a uniform magnetic field perpendicular to its plane of rotation. Obtain an expression for the rotational e.m.f. induced between the ends of the bar.
Obtain an expression for practical determination of end correction -- (i) for a pipe open at both ends and (ii) for a pipe closed at one end.