Cathode rays are :
Protons
Neutrons
Electrons
Positrons
During any physical or chemical change takes place, the total mass of the matter remains:
Different
Zero
Same
None of these
The mass of an electron
1/1940
1/2940
1/1840
Who proposed first the word 'electron' for atom of electricity ?
J.J. Thomson
William Crooke
Proust
Stoney
________ proposed that atom consists of a positively charged sphere where electrons are embedded in that sphere
Thomson
Dalton
Bohr
Rutherford
Which one of the following is a wrong statement regarding to the postulates of Thomson's atom model ?
Atom consists of a positively charged sphere.
Electrons are uniformly distributed in that sphere.
Atom as a whole is electrically neutral.
The positive and negative charges are different in magnitude.
Barium chloride reacts with sodium sulphate solution to form :
Sodium thiosulphate
Barium sulphate
Sulphur dioxide
Hydrogen sulphide
In water, hydrogen and oxygen are in the ratio by mass :
1:8
8:1
2:3
3:2
According to ____________ matter is made up of small, indivisible particles called atoms.
Newton
Lavoisier
The scientist who discovered portons
Goldstein
Bohar
None of them
