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

State and explain Newton's law of viscosity.

A force of 0.01 N is required to move a flat glass plate of area of 10 cm² with a uniform velocity of 1 cm/ s over the surface of a liquid 2 mm thick. If the coefficient of viscosity of the liquid is 20 poise, the velocity gradient in the liquid layer is ______.

The dimensions of coefficient of viscosity are ______.

A water pipe with diameter of 5.0 cm is connected to another pipe of diameter 2.5 cm. How would the speeds of the water flow compare?

State Stoke’s law and give two factors affecting angle of contact.  

Derive an expression for the terminal velocity of the sphere falling under gravity through a viscous medium. 

State Stokes' law and an expression for the magnitude of the viscous force.

Why does the speed of a liquid increase and its pressure decrease when a liquid passes through a constriction in a horizontal pipe?

Bernoulli's equation for an ideal fluid in streamline flow may be written as

Bernoulli's theorem is based on the conservation of

What is the basis of Bernoulli’s principle?

Explain the working of an atomizer.

Write whether the following statement is ‘True’ or ‘False’:

One of the major obstacles to getting help from a mental health professional is the stigma attached to mental illness.

Psychology is simply a pseudoscience.

Bringing objects, persons or situations from the field of awareness into the center of awareness is called attention.

Answer in one sentence.

Which hormone is secreted by thyroid gland?

Answer the following question in 25 to 30 words:

Write in your own words how the mass media affects personality.

Answer the following question in 25 to 30 words:

Explain in your own words the importance of 'encouraging to get professional help'.

Match the words from group 'A' and 'B' appropriately :

Write answers to the following question based on example only in a word:

The sound of firecrackers disrupted Sheetal's concentration in studies. Later she could not concentrate on studies. This is a description of which aspect of attention?