In which year was the first reliable measurement on

What is the primary cause of acid rain?

The scientific name of vitamin B12 is :

Identify the gas that is not considered a permanent part of the Earth's atmosphere.

Who is credited with the discovery of the neutron particle in an atom?  

For domestic wiring purposes, how are circuits connected?

Consider the following statements about Vyommitra: 

What element is primarily used in a Proton Fusion Engine?

Thiamine deficiency may result in:

Consider the following statements in regards to BharOS:

1.  It is developed by JandK Operations Private Limited

What is the wavelength range of the visible spectrum?