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

What is a stationary wave?

Given the nuclear radius of ¹⁶O is 3.024 fm, find that of ²³⁵U.

Show that the angular speed of an electron in the nth Bohr orbit is w = `(πme^4)/(2ε_0^2h^3n^3)` and the corresponding frequency of the revolution of the electron is f = `(me^4)/(4ε_0^2h^3n^3)`.

State and prove the theorem of the parallel axis about the moment of inertia.

State the expressions for the displacement, velocity and acceleration draw performing linear SHM, starting from the positive extreme position. Hence, their graphs with respect to time.

The half-life of `""_82^210Pb` is 22.3 y. How long will it take for its activity 0 30% of the initial activity?

According to the kinetic theory of gases, at a given temperature, molecules of all gases have the same ______.

Define the coercivity of a magnetic material.

What is the radius of gyration of a right circular cone of base radius R for rotation about the central symmetry axis of the cone?

Prove the theorem of perpendicular axes about the moment of inertia.

Compute the shortest and the longest wavelength in the Lyman series of hydrogen atom.

If a = 0. 72 and t = 0.04, then the value of r is ______.

Efficiency of transformer is the ratio of ______.

Calculate the de Broglie wavelength associated with an electron moving with a speed of `5 xx 10^6` m/s. `(m_e = 9.1 xx 10^(-31)kg)`

Derive an expression for the total emf induced in a conducting rotating rod.

At what temperature will therms velocity of a gas be four times its value at STP?

A magnetic flux associated with a coil changes by 0.04 Wb in 0.2 second. The induced emf with coil is ______.

If a = 0. 72 and r = 0.24, then the value of t is ______.

Find the ratio of radius of 1^st Bohr orbit to that of 4^th Bohr orbit.

Draw the graph for variation of magnetic suceptibility (`chi`) of a material with temperature (T) and hence explain Curie temperature.