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

Answer in brief:

What will happen to the mean square speed of the molecules of a gas if the temperature of the gas increases?

Answer in brief:

A gas in a cylinder is at pressure P. If the masses of all the molecules are made one-third of their original value and their speeds are doubled, then find the resultant pressure.

Answer in brief:

Show that rms velocity of an oxygen molecule is `sqrt2` times that of a sulfur dioxide molecule at S.T.P.

At what temperature will oxygen molecules have same rms speed as helium molecules at S.T.P.? (Molecular masses of oxygen and helium are 32 and 4 respectively).

Answer in brief:

Compare the rms speed of hydrogen molecules at 127°C with rms speed of oxygen molecules at 27ºC given that molecular masses of hydrogen and oxygen are 2 and 32 respectively.

Choose the correct option:

The graph shows variation of displacement of a particle performing S.H.M. with time t. Which of the following statements is correct from the graph?

What will be the effect on the position of zero deflection if only the current flowing through the potentiometer wire is decreased?

Answer in brief:

State the characteristics of stationary waves.

An electron, a proton, an α-particle, and a hydrogen atom are moving with the same kinetic energy. The associated de Broglie wavelength will be longest for ______.

State the importance of Davisson and Germer experiment.

What is the speed of a proton having de Broglie wavelength of 0.08 Å?

Answer in brief.

State the postulates of Bohr’s atomic model.

Derive the expression for the energy of an electron in the atom.

In an ideal gas, the molecules possess ______.

If the density of oxygen is 1.44 kg/m³ at a pressure of 10⁵ N/m², find the root mean square velocity of oxygen molecules.

When a gas is heated, its temperature increases. Explain this phenomenon on the basis of the kinetic theory of gases.

Explain, on the basis of the kinetic theory of gases, how the pressure of a gas changes if its volume is reduced at a constant temperature.

Calculate the ratio of the mean square speeds of molecules of a gas at 30 K and 120 K.

Two vessels A and B are filled with the same gas where the volume, temperature, and pressure in vessel A is twice the volume, temperature, and pressure in vessel B. Calculate the ratio of the number of molecules of the gas in vessel A to that in vessel B.

Find the kinetic energy of 5 litres of a gas at STP, given the standard pressure is 1.013 × 10⁵ N/m².