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

A steam engine delivers 4.8 x 10⁸ Jof work per minute and services 1.2 x 10⁹ J of heat per minute from its boiler. What is the percentage efficiency of the engine?

A spring balance has a scale that reads from 0 to 50 kg. The length of the scale is 20 cm. A body suspended from this balance, when displaced and released osillates with a period of 0.6 sec. What is the weight of the body?

The rms speed of molecules of a certain gas at 300 K is 400 m/ s. The rms speed if the gas is heated to 600 K is ______.

Wave normals to spherical wavefronts can be ______.

What is heat?

Explain the output characteristics of common emitter configuration of n-p-n transistor.

A system releases 125 kJ of heat while 104 kJ work is done on the system. Calculate the change in internal energy.

What Types of wavefront?

Explain the Domain theory in brief.

Explain the Domain theory in brief.

Write a short note on Helical motion.

The moment of inertia (MI) of a disc of radius R and mass M about its central axis is ______.

Explain the change in internal energy of a thermodynamic system (the gas) by heating it.

Why a detergent powder is mixed with water to wash clothes?

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.