HSC Science (Computer Science) इयत्ता १२ वी - Maharashtra State Board Question Bank Solutions for Physics

The work done in bringing a unit positive charge from infinity to a given point against the direction of electric field is known as ______.

Define α.

Define β

Compare the rms speed of hydrogen molecules at 227°C with the rms speed of oxygen molecules at 127°C. Given that molecular masses of hydrogen and oxygen are 2 and 32 respectively.

Calculate the wavelength of the first two lines in the Balmer series of hydrogen atoms.

In U. C. M (Uniform Circular Motion), prove the relation `vec v = vec w xx vec r`, where symbols have their usual meanings.

A particle rotates in U.C.M. with tangential velocity V along a horizontal circle of diameter ‘D' . Total angular displacement of the particle in time 't' is..........

If sound waves are reflected from surface of denser medium, there is phase change of.......

The decay constant of radioactive substance is 4.33 x 10^-4 per year. Calculate its half life period.

State the principle on  which transformer works.

Explain the construction and working of the transformer. 

Derive an expression for ratio of e.m.f.s and currents in terms of number of turns in primary and secondary coil.

Determine the change in wavelength of light during its passage from air to glass. If the refractive index of glass with respect to air is 1.5 and the frequency of light is 3.5 x 10¹⁴ Hz, find the wave number of light in glass.

[Velocity of light in air c = 3 x 10⁸ m/s]

In biprism experiment, 10th dark band is observed at 2.09 mm from the central bright point on the screen with red light of wavelength 6400 A. By how much will fringe width change if blue light of wavelength 4800A is used with the same setting?

State the theorem of perpendicular axes about moment of inertia.

Linear momentum of an electron in Bohr orbit of H-atom (principal quantum number n) is proportional to ______.

The power radiated by linear antenna of length T is proportional to........................

(λ= wavelength)

1. `lambda/ l`
2. `[lambda/l]^2`
3. `l/lambda`
4. `[l/lambda]^2`

Describe biprism experiment to calculate the wavelength of a monochormatic light. Draw the necessary ray diagram.

State an expression for the moment of intertia of a solid uniform disc, rotating about an axis passing through its centre, perpendicular to its plane. Hence derive an expression for the moment of inertia and radius of gyration:

i. about a tangent in the plane of the disc, and

ii. about a tangent perpendicular to the plane of the disc.

The pressure (P) of an ideal gas having volume (V) is 2E/3V , then the energy E is _______.