HSC Science (Electronics) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions for Physics

Find the wavelength at which a black body radiates maximum energy, if its temperature is 427°C.
(Wein’s constant b = 2.898 × 10^-3 mK)

(A) 0.0414 × 10^-6m

(B) 4.14 × 10^-6m

(C) 41.4 × 10^-6m

(D) 414 × 10^-6m

If A.C. voltage is applied to a pure capacitor, then voltage across the capacitor _____________.

State and prove Kirchoff’s law of heat radiation.

Find the ratio of longest wavelength in Paschen series to shortest wavelength in Balmer series.

The speed limit for a vehicle on road is 120 km/ hr. A policeman detects a drop of 10% in the pitch of horn of a car as it passes him. Is the policeman justified in punishing the car driver for crossing the speed limit? (Given: Velocity of sound= 340 m/s)

In hydrogen atom Balmer series is obtained when the electron jumps from ............ .

(a) higher orbit to first orbit

(b) first orbit to a higher orbit

(c) higher orbit to the second orbit

(d) second orbit to a higher orbit

What is de Broglie wavelength of an electron accelerated through 25000 volt?

Light of wavelength 3000Å falls on a metal surface having work function 2.3 eV. Calculate the maximum velocity of ejected electrons

(Planck's constant h = 6.63 x 10^-34 J.s., Velocity of light c = 3 x 10⁸ m/s, mass of an electron = 9.1 x 10^-31 kg)

With the help of a neat diagram, describe the construction and working of van de Graff generator.

Explain black body radiation spectrum in terms of wavelength

Define the coefficient of self-induction.

Write the SI unit and dimention of of co-efficient of self induction

What is perfectly black body ? Explain Ferry’s black body.

Choose the correct option

A current through a coil of self-inductance 10 mH increases from 0 to 1 A in 0.1 s. What is the induced emf in the coil?

The total energy of a body of mass 2 kg performing S.H.M. is 40 J. Find its speed while crossing the center of the path.

Choose the correct option:

Energy stored in a capacitor and dissipated during charging a capacitor bear a ratio.

Efficiency of a Carnot engine is large when ______.

The efficiency of a Carnot cycle is 75%. If the temperature of the hot reservoir is 727°C, calculate the temperature of the cold reservoir.

A Carnot refrigerator operates between 250°K and 300°K. Calculate its coefficient of performance.

A system is taken to its final state from initial state in hypothetical paths as shown figure calculate the work done in each case.