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

Under which condition laws of Boyle, Charles, and Gay-Lussac are valid?

On what, the values of absorption coefficient, reflection coefficient, and transmission coefficient depend, in addition to the material of the object on which the radiation is an incident? 

Why the temperature of all bodies remains constant at room temperature?

Above what temperature, all bodies radiate electromagnetic radiation? 

If the density of nitrogen is 1.25 kg/m³ at a pressure of 10⁵ Pa, find the root mean square velocity of nitrogen molecules. 

Compare the rate of radiation of metal bodies at 727 °C and 227 °C.  

A metal cube of length 4 cm radiates heat at the rate of 10 J/s. Find its emissive power at a given temperature. 

A particle is performing simple harmonic motion with amplitude A and angular velocity ω. The ratio of maximum velocity to maximum acceleration is ______.

Acceleration of a particle executing S.H.M. at its mean position.

A particle is performing S.H.M. of amplitude 5 cm and period of 2s. Find the speed of the particle at a point where its acceleration is half of its maximum value.

Using the differential equation of linear S.H.M., obtain an expression for acceleration, velocity, and displacement of simple harmonic motion. 

What are stationary waves? Why are they called stationary waves? 

For a stationary wave set up in a string having both ends fixed, what is the ratio of the fundamental frequency to the third harmonic?

Show that the distance between two successive nodes or antinodes is λ/2.

What is the shape of the wavefront on Earth for Sunlight?

Explain the reflection of light at a plane surface with the help of a neat ray diagram. 

Find the amount of work done in rotating an electric dipole of dipole moment 3.2 x 10^{- 8}Cm from its position of stable equilibrium to the position of unstable equilibrium in a uniform electric field if intensity 10⁴ N/C.  

The SI unit of the potential gradient is ______  

When the null point is obtained in the potentiometer, the current is drawn from the ______  

If the potential gradient of a wire decreases, then its length ______