Which of the following are true for an element?
(i) Atomic number = Number of protons+ Number of electrons
(ii) Mass number= Number of protons+ Number of neutrons
(iii) Atomic mass= Number of protons= Number of neutrons
(iv) Atomic number= Number of protons= Number of electrons
(i) and (ii)
(i) and (iii)
(ii) and (iii)
(ii) and (iv)
Dalton's atomic theory successfully explained
(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportion
(i), (ii) and (iii)
(i), (iii) and (iv)
(ii), (iii) and (iv)
(i), (ii) and (iv)
The specific charge of positive rays is maximum when the gas taken in the discharge tube is:
Oxygen
Nitrogen
Helium
Hydrogen
Gamma rays are:
High energy electrons
Low energy electrons
High energy electromagnetic radiations
High energy positrons
Which is not related to cathode ray ?
These rays originate from cathode .
They travel in straight line .
These rays produce shadow of objects placed in their path .
These rays carry a positive charge .
The electron distribution in an aluminium atom is ___________ .
2,8,3
2,8,2
8,2,3
2,3,8
Rutherford's alpha ray scattering experiments did not provide any information about __________ .
charge on the nucleus of an atom .
size of the nucleus.
arrangement of sub atomic particles .
none of these.
Thomson's atom model is known as __________ .
planetary model
plum pudding model
plannar model
none of these
Neutrons possess ___________ charge .
neutral
positive
negative
____________ are called canal rays .
Neutrons
Protons
Cathode rays
