HSC Science (Electronics) इयत्ता १२ वी - Maharashtra State Board Question Bank Solutions

Given the following data for incident wavelength and the stopping potential obtained from an experiment on the photoelectric effect, estimate the value of Planck's constant and the work function of the cathode material. What is the threshold frequency and corresponding wavelength? What is the most likely metal used for emitter?

Insect moves over the surface of water because of ______.

The water droplets are spherical in free fall due to ______ 

The surface tension of a liquid at critical temperature is ______ 

Define surface tension.

What will be the shape of the liquid meniscus for the obtuse angle of contact? 

Water rises to a height of 20 mm in a capillary tube. If the radius made 1/3^rd of its previous value, to what height will the water now rise in the tube?  

Two soap bubbles have a radius in the ratio of 2:3. Compare the works done in blowing these bubbles.  

Explain the phenomena of surface tension on the basis of molecular theory.

Obtain an expression for the capillary rise or fall using the forces method.  

A u-tube is made up of capillaries of bore 1 mm and 2 mm respectively. The tube is held vertically and partially filled with a liquid of surface tension 49 dyne/cm and zero angles of contact. Calculate the density of the liquid, if the difference in the levels of the meniscus is 1.25 cm. take g = 980 cm/s²  

Two systems at the same temperature are said to be in ______ 

When two objects are said to be in thermal equilibrium?

Write a note on thermodynamic equilibrium.

A particle is moving in a circle with uniform speed. Its motion is ______ 

Light of wavelength 5000 A.U. falls on a plane reflecting surface. The frequency of reflected light is ______ 

In Young’s double-slit experiment, if there is no initial phase difference between the light from the two slits, a point on the screen corresponds to the 5th minimum. What is the path difference? 

Kirchhoff’s second law (voltage law) is based on ______ 

State Kirchhoff’s first (current) law.

State Kirchhoff’s second (voltage) law.