HSC Science (Computer Science) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions

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

For polyatomic molecules having 'f' vibrational modes, the ratio of two specific heats,Cp/Cv  is..........

On what factors do the degrees of freedom depend?

State the law of equipartition of energy and hence calculate the molar specific heat of mono-atomic and di-atomic gases at constant volume and constant pressure.

Show that the average energy of the molecules of a gas is directly proportional to the absolute temperature of the gas. 

Determine the molecular kinetic energy (i) per mole (ii) per gram (iii) per molecule of nitrogen molecules at 227°C, R = 8.310 J mole^-1 K^-1,No = 6.03 x 10²⁶ moleculesKmole^-1. Molecular weight of nitrogen = 28. 

When a thin hollow sphere rolls without slipping on a flat surface, the fraction of its total energy associated with rotation is ______.

The law of equipartition of energy is valid for ______.

Explain the rise of liquid in the capillary on the basis of pressure difference.

Calculate the density of paraffin oil, if glass capillary of diameter 0.25 mm dipped in paraffin oil of surface tension 0.0245 N/m rises to a height of 4 cm. (Angle of contact of paraffin with glass = 28^° and acceleration due to gravity = 9.8 m/s².)

Draw a neat, labelled diagram for a liquid surface in contact with a solid, when the angle of contact is acute.

Two soap bubbles have radii in the ratio 4:3. What is the ratio of work done to blow these bubbles?

If two capillary tubes of different diameters are partially dipped in the same liquid vertically, then the rise of liquid ______.

Draw a neat labelled diagram of rise of liquid in capillary tube showing different components of tension (force).

A soap bubble of radius 12 cm is blown. Surface tension of soap solution is 30 dyne/cm. Calculate the work done in blowing the soap bubble.

Obtain an expression for the rise of a liquid in a capillary tube.

A liquid rises in glass capillary tube upto a height of 2.5 cm at room temperature. If another glass capillary tube having radius half that of the earlier tube is immersed in the same Liquid, the rise of liquid in it will be _______.

A liquid rises to a height of 5 cm in a glass capillary tube of radius 0.02 cm. The height to which the liquid would rise in a glass capillary tube of radius 0.04 cm is ______.

What is the excess of pressure inside a soap bubble of radius 3 cm if the surface tension of the soap solution is 30 dyne/cm?