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

Derive an expression for law of radioactive decay. Define one becquerel (Bq).
A flywheel of a motor has mass 100 kg and radius 1.5 m. The motor develops a constant torque of 2000 Nm. The flywheel starts from rest. Calculate the work done during the first 4 revolutions.
In a thermodynamic system, define -- (a) Mechanical equilibrium (b) Chemical equilibrium and (c) Thermal equilibrium
A gas of 0.5 mole at 300 K expands isothermally from an initial volume of 2.0 litre to a final volume of 6.0 litre. What is the work done by gas?
A body of mass 0.8 kg performs linear S.H.M. It experiences a restoring force of 0.4N, when its displacement from mean position is 4 cm. Determine Force constant and Period of S.H.M.
State the advantages of a potentiometer over a voltmeter.
In a series LCR circuit, if resistance, inductive reactance and capacitive reactance are 3\(\Omega\), 8\(\Omega\) and 4\(\Omega\) respectively, calculate phase difference between voltage and current.
Obtain an expression for the period of a bar magnet vibrating in a uniform magnetic field, performing S.H.M.
In a thermodynamic system, define -- (a) Mechanical equilibrium (b) Chemical equilibrium and (c) Thermal equilibrium
Explain harmonics and overtones.
Two coils having self inductances 60 mH each, are coupled with each other. If the coefficient of coupling is 0.75, calculate the mutual inductance between them.
State any four advantages of light emitting diode (LED).
Calculate the energy radiated in one minute by a perfectly black body of surface area 200 cm\(^2\) when it is maintained at 127\(^{\circ}\)C.
What is the work done by an external uniform magnetic field perpendicular to the velocity of a moving charge?
What do you mean by a thermodynamic system?
State the formula for angle of banking.
Find kinetic energy of 1 litre of an ideal gas at S.T.P.
Which of the following equations gives correct expression for the internal resistance of a cell by using potentiometer?
The gate which produces high output, when its both inputs are high is --
An electron, a proton, an \(\alpha\)-particle and a hydrogen atom are moving with the same kinetic energy. The associated de-Broglie wavelength will be longest for --
A transformer increases an alternating e.m.f. from 220V to 880V. If primary coil has 1000 turns, the number of turns in the secondary coil are .............
A string of length 2 m is vibrating with 2 loops. The distance between its node and adjacent antinode is ............
In Bernoulli's theorem, which of the following is constant?
Electric potential 'V' at a distance 'r' from a point charge is directly proportional to ............

Prove Mayer's relation: \( C_p - C_v = \frac{R}{J} \)