The isotope of uranium capable of sustaining chain reactions is
1 U-235
2 U-238
3 U-239
4 None of these
the basic approach to science was established by:
According to Dalton’s atomic theory, the smallest particle which can exist independently is 1 An atom 2 A molecule 3 A cation 4 An anion
Why is food necessary for human body ?
What are luminous irregular nebulae?
What is the work of a patent engineer? Does the experience in working as patent engineer helps in finding a job in a refinery?
A substance which changes readily into vapor without heating is called 1 Efflorescent 2 Synthetic 3 Volatile 4 Effervescent
Which of the following minerals has the lower numerical hardness value? 1 Talc 2 Gypsum 3 Apatite 4 Topaz
The neutral atom’s two isotopes differ in the number of 1 Electron shells 2 Protons 3 Valence electrons 4 Neutrons
Bleaching powder is made from 1 Sulphur dioxide and gypsum 2 Chlorine and charcoal 3 Soda ash and lilme 4 Lime and chlorine
A super conductor is characterized by 1 Zero permeability 2 Low permeability 3 High permeability 4 Infinite permeability
iS ELEMENT IRON RADIOACTIVE AND WHY?
Which is the largest refractor telescope?