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

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.  

An ideal transformer has 100 turns in the primary and 250 turns in the secondary. The peak value of the AC is 28 V. The rms secondary voltage is nearest to ______ 

State the mathematical relation between a number of turns in the primary coil to a secondary coil in the step-up transformer. 

Distinguish between Step up and Step Down Transformer.

What is Transformer?

Explain step up and step down transformer?

The primary of a transformer has 40 turns and works on 100 V and 100 W. Find a number of turns in the secondary to step up the voltage to 400 V. Also calculate the current in the secondary and primary.