The recent atomic weight scale is based on
1 1H1
2 1H2
3 6C12
4 8O16
What are pulsars?
Which of the following fibers is least prone to fire? 1 Rayon 2 Nylon 3 Cotton 4 Terycott
What is light year?
iS ELEMENT IRON RADIOACTIVE AND WHY?
What is the Taxonomy ?
Who is the second female cosmonaut?
Study of life in outer space is called A) Endobiology B) Exobiology C) Entrobiology D) Neobiology
What vendors does Ameber Recommed?
Emerald is ----in colour 1 Violet 2 Yellow 3 Deep green 4 Prussian blue
Water is a compound because 1 It exists as a solid, a liquid or a gas 2 It contains hydrogen and oxygen 3 It contains two different elements joined by chemical bonds 4 It cannot be split up into simpler substances by chemical means
Which of the following reactions is used for increasing the number of carbon atoms in a chain? 1 Substitution reaction 2 Wurtz reaction 3 Friedel – Crafts reaction 4 Cannizzaro’s reaction
Which of the following is used as a coolant in nuclear reactors? 1 Heavy water 2 Cadmium 3 Liquid sodium 4 None of these
2 Answers WBCS West Bengal Civil Service,