HSC Science (Electronics) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions for Physics

State the formula giving the relation between electric field intensity and potential gradient.

State unit and dimensions of Magnetic susceptibility.

State unit and dimensions of Magnetic susceptibility.

Derive expressions for the linear velocity at the lowest position, mid-way position and top-most position for a particle revolving in a vertical circle, if it has to just complete circular motion without string slackening at the top.

An air-cored solenoid, 40 cm long and of cross-sectional area 5 cm², is tightly wound with 400 turns of copper wire and carries a steady current of 10 A. (a) Calculate the self-inductance of the solenoid. (b) Find the emf induced if the current in the solenoid decreases to zero in 0.2 s.

With a neat labelled diagram, explain the working of a photodiode. Calculate the wavelength in angstrom at which the emissive power is maximum for a blackbody heated to 3727 °C.

State the factors which control the wavelength of light emitte d by an LED.

In the given circuit, if I = 100 mA and I₁ = I₄ = 60 mA, the currents I₃ and I₅ are ______.

The dimensions of magnetic intensity are ______.

The dimensions of magnetic intensity are ______.

The kinetic energy per molecule of a gas at temperature T is ______.

Explain the use of Wheatstone's metre bridge to determine an unknown resistance.

Zener breakdown results from breaking of Si-Si covalent bonds in a silicon junction diode due to ______.

What is a phasor?

State the factors on which the magnetic coupling coefficient of two coils depends.

Draw neat labelled diagrams for the first and second overtones of vibration of an air column in a pipe open at both ends.

Temperature remaining constant, if you double the number of molecules in a box, the pressure will ______.

The magnetization of a bar magnet of length 4 cm, cross-sectional area 1 cm2 and magnetic moment 2 SI units is ______.

The magnetization of a bar magnet of length 4 cm, cross-sectional area 1 cm2 and magnetic moment 2 SI units is ______.

With an unknown resistance X in the left gap and a resistance of 30 Ω of the gap of a metre bridge, the null point is obtained at 40 cm from the left end of the wire. Find the unknown resistance. Also, find the shift in the null point when resistance in each gap is shunted by a resistance of 8 Ω.