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
Name the scientist who has been invited by the Srilankan Governement to have a Study on Employment development?
Soda-acid fire extinguisher involves the reaction between 1 Sodium hydroxide and nitric acid 2 Sodium bi carbonate and sulphuric acid 3 Sodium sulphate and carbonic acid 4 Sodium carbonate and hydrochloric acid
what is defination of conductivity? How much conductivity of water ? what is effect when conductity of water low or high?
Which of the following metals was first discovered by man? 1 Bronze 2 Silver 3 Iron 4 Copper
Which of the following has the lease penetrating power? 1 Alpha particles 2 Beta particles 3 Gamma rays 4 All have the same penetrating power
What does the Haversion central canal in each osteon contains?
HELPS IN PROPAGATING RADIO SIGNALS
Which country has no sunrise?
Which synthetic fiber is known as artificial silk? 1 Cotton 2 Rayon 3 Terylene 4 Nylon
why we are not measure the turbidity in mg/lit?
Which of the following is not a chemical reaction? 1 Burning of paper 2 Digestion of food 3 Conversion of water into steam 4 Burning of coal
Old-written material, which cannot be read easily, can be read by 1 Cosmic rays 2 Ultraviolet rays 3 Infra red rays 4 None of these