____________ are called canal rays .
Neutrons
Protons
Cathode rays
none of these
Rutherford's α- particles scattering experiment showed that
(i) atoms are spherical in shape and mostly hollow .
(ii)atom is stable
(iii) the electrons are seen inside the nucleus .
(iv) electrons revolve around the nucleus ,like planets around the sun .
(i) and (iv)
(ii) and (iii)
(ii)
(iii)
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 specific charge of positive rays is maximum when the gas taken in the discharge tube is:
Oxygen
Nitrogen
Helium
Hydrogen
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)
Which of the following have no mass or charge ?
Alpha particles
Beta particles
Gamma rays
Which of the following is not an electromagnetic radiation?
Infrared rays
X-rays
cathode rays
Which of the following fundamental particles is not deflected by a magnetic field?
Proton
Neutron
Electron
Positron
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 (iv)
Magnitude of the proton in an atom is equal to that of _________ .
electron
neutron
neutrino
antineutrino
