(a) Electron
 

(b) Proton
 

(c) Neutron
 

(d) Molecule

(a) Rutherford
 

(b) J. J. Thomson
 

(c) James Chadwick
 

(d) Niels Bohr

(a) in elliptical paths
 

(b) in circular orbits of fixed energy
 

(c) without losing energy

(d) (b) and (c) both 

(a) solid
 

(b) empty space
 

(c) filled with electrons
 

(d) filled with neutrons

(a) electrons only
 

(b) protons and neutrons
 

(c) protons and electrons
 

(d) neutrons and electrons

(a) Atomic weight
 

(b) Atomic number
 

(c) Mass number
 

(d) Neutron number

(a) Same atomic number but different mass numbers
 

(b) Different atomic number but same mass number
 

(c) Same number of neutrons
 

(d) Same chemical properties

(a) Same mass number but different atomic numbers
 

(b) Same atomic number but different mass numbers
 

(c) Same number of neutrons
 

(d) Same electrons

(a) Protons only
 

(b) Protons and electrons
 

(c) Protons and neutrons
 

(d) Electrons only

(a) Gravitational force
 

(b) Magnetic force
 

(c) Nuclear force
 

(d) Electrostatic force

(a) Stronger than the Coulomb force
 

(b) Independent of electric charge
 

(c) Acts equally between p–p, n–n, p–n
 

(d) All of the above

(a) Emission of alpha, beta, and gamma rays
 

(b) Chemical reaction
 

(c) Ionization of atoms
 

(d) Splitting of nucleus by force

(a) +1 charge
 

(b) +2 charge
 

(c) -1 charge
 

(d) No charge

(a) Helium nuclei
 

(b) Electrons
 

(c) Neutrons
 

(d) Gamma rays

(a) Charged particles
 

(b) Neutral electromagnetic waves
 

(c) Positively charged
 

(d) Negatively charged

(a) Alpha < Beta < Gamma
 

(b) Beta < Gamma < Alpha
 

(c) Gamma < Beta < Alpha
 

(d) Alpha < Gamma < Beta

(a) 573 years
 

(b) 5730 years
 

(c) 57300 years
 

(d) 57.3 years

(a) All radioactive atoms to decay
 

(b) Half of radioactive atoms to decay
 

(c) One atom to decay
 

(d) Stable atoms to decay

(a) Combining light nuclei
 

(b) Splitting a heavy nucleus
 

(c) Emission of photons
 

(d) Conversion of neutrons to protons

(a) Nuclear fission
 

(b) Nuclear fusion
 

(c) Chemical reaction
 

(d) Combustion

(a) Reaction stops after one step
 

(b) Number of reactions multiplies automatically
 

(c) Requires continuous external input
 

(d) Energy decreases with time

(a) Alpha
 

(b) Beta
 

(c) Gamma
 

(d) Neutron

(a)  only 1

(b)  2 and 3

(c) 1, 2 nad 4

(d)  All  are Correct

(a) Electrons revolve in fixed orbits.
 

(b) Energy of electron orbits is quantized.
 

(c) Electrons radiate energy continuously.
 

(d) Energy is emitted or absorbed when electrons jump between orbits.

(a) Number of electrons
 

(b) Number of neutrons and protons
 

(c) Nuclear force
 

(d) Both (b) and (c)