Maharashtra Board Class 12 Physics Guess Paper 2027

The Boolean equation for NOR gate is (a) Y = A.B (b) Y = (A + B) bar (c) Y = A bar (d) Y = A + B

A conducting rod of length l, rotates about one of its ends in a uniform magnetic field B, with a constant angular velocity omega. If the plane of rotation is perpendicular to B, the e.m.f. induced between the ends of rod is _____. (a) (1/2) B omega l² (b) B omega l² (c) 2 B omega l² (d) B omega l

A ceiling fan has moment of inertia of 2 kg m². It attains maximum frequency of 60 r.p.m. in 2 seconds. Calculate its power rating.

Cyclotron can not accelerate _____ (a) protons (b) alpha-particles (c) neutrons (d) deuterons

In a purely inductive and capacitive circuit, power factor is, _____ (a) one (b) zero (c) infinity (d) 10

The MI of ring of radius 'R' and mass 'M' about its central axis is _____ (a) 2 MR² (b) MR²/2 (c) MR² (d) (3/2) MR²

When n number of capacitors having each of capacity 'C' are connected in series, their equivalent capacity is (a) 1/C (b) nC (c) C/n (d) 1/(nC)

What is the coefficient of transmission for athermanous materials?

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) proton (b) electron (c) hydrogen atom (d) alpha-particle

When a number of droplets coalesce to form a single drop, the total surface area of the drop _____. (a) decreases (b) becomes zero (c) remains same (d) increases

Define magnetization. State its S.I. unit and dimensions. What is the relation between permeability and magnetic susceptibility?

Define : (i) Self inductance (ii) Mutual inductance. [Second part:] A conducting loop of area 1 m² is placed normal to a uniform magnetic field of 3 Wb/m². If the magnetic field is uniformly reduced to 1 Wb/m² in 0.5 second, calculate the induced e.m.f. produced in the coil.

State any two postulates of Bohr's theory of hydrogen atom.

What is the resistance of an ideal voltmeter?

Write the differential equation for linear S.H.M.

State the formula for electric field intensity due to uniformly charged spherical shell.

Obtain an expression for orbital magnetic moment of an electron revolving around the nucleus of an atom.

Define logic gate and explain why NOT gate is called an inverter. [Second part:] The transistor is in the common emitter configuration. Its DC current gain is 50. If collector current is 3mA, calculate the base current.

For a thermodynamic system : Define : (a) Mechanical equilibrium (b) Chemical equilibrium

A galvanometer has a resistance of 40 ohm and a current of 4 mA is needed for full scale deflection. What is the resistance and how is it to be connected to convert the galvanometer (a) into an ammeter of 0.4 A range and (b) into a voltmeter of 5 V range?

An alternating voltage source given by e = 140 sin(314.2 t) is connected across a pure resistor of 50 ohm. Determine : (i) Frequency of the source. (ii) RMS value of emf.

Obtain an expression for the maximum speed of a vehicle along horizontal circular curved road.

With the help of neat diagram explain construction of a transformer. [Second part:] Calculate energy required to build up current of 1A in an inductor of inductance 20 mH.

Distinguish between harmonics and overtones. [Any Two points]

Two tuning forks having frequencies 160 Hz and 170 Hz are sounded together to produce sound waves. The velocity of sound in air is 326.4 m/s. Calculate the difference between wavelengths of these waves.

Derive an expression for the magnetic field produced by a current in a circular arc of a wire using Biot-Savart law.

Calculate the shortest wavelength of Paschen series and the longest wavelength of Balmer series for hydrogen atom.

Using phasor diagram for a series LCR circuit, obtain an expression for impedance. Define admittance.

Define isothermal process. Obtain an expression for work done during isothermal process. Draw P-V diagram.

Derive an expression for pressure exerted by a gas on the basis of kinetic theory of gases.

What is photoelectric effect? Describe with neat circuit diagram an experimental setup of photoelectric effect.

Define surface tension. Obtain the relation between surface tension and surface energy.

What is interference of light? State any four conditions for obtaining well defined and steady interference pattern.

With a neat circuit diagram, explain the working of a full wave rectifier. Draw input-output waveforms.

0.5 mole of an ideal gas at 300 K, expands isothermally from an initial volume of 2 L to a final volume of 6 L. Calculate : (a) work done by the gas (b) heat supplied to the gas [Given : R = 8.31 J mol^-1 K^-1]

Obtain an expression for period of a bar magnet vibrating in a uniform magnetic field and performing angular S.H.M.

Calculate the radius of water drop, so that the excess pressure inside it is 24 N/m². [Surface tension of water = 7.2 x 10^-2 N/m]