The isotope C-12 is present in abundance of:
(A) 96.9 %
(B) 97.6 %
(C) 99.7 %
(D) none of these
Which one of the following is the most penetrating?
(A) protons
(B) electrons
(C) neutrons
(D) alpha particles
Protons were discovered by:
(A) Thomson
(B) Chadwick
(C) Moseley
(D) Goldstein
Which one of the following results in the discovery of proton
(A) cathode rays
(B) canal rays
(C) x-rays
(D) alpha rays
Plum pudding model was put forwarded by:
(A) Dalton
(B) Thomson
(C) Goldstein
(D) Chadwick
Neutron was discovered by
(A) Rutherford
(B) Chadwick
(C) Bohr
(D) William Crooks
Deuterium is used to make:
(A) light water
(B) heavy water
(C) soft water
(D) hard water
Atom of the same elements are
(A) Different
(B) Alike
(C) Comparable
(D) Active
Which of the following are fundamental particles of an atom?
(A) Ion
(B) Molecular ion
(C) Electron
(D) Positron
The highly penetrating rays are:
(A) Alpha particle
(B) Beta particle
(C) Neutron
(D) Both a & b
