The atomic number of an atom is equal to its
number of nucleus
number of neutrons
number of electrons
atomic mass
A radio set receives electro magnetic waves and converts them in to sound waves back with the help of
antenna
receiver
speaker
tuner
A tape recorder can be used both for recording and reproduction of sound with the help of
magnetic property of the tape
electrical property of the tape
chemical property of the tape
metallic property of the tape
The particles emitted as a result of falling of light rays on certain metallic surfaces.
Atoms
Molecules
Electrons
X-Rays
J.J. Thomson invented
molecule
atom
proton
electron
Electric current in metal wires is due to the flow of
protons
neutrons
electrons
orbits
The velocity of electro magnetic waves.
3 lakh kilometers per second
5 lakh kilometers per second
4 lakh kilometers per second
1 lakh kilometers per second
J.J. Thomson discovered electron in
1892
1893
1864
1895
TV was invented by
James Watt
Edison
J.L.Biard
Graham Bell
Matter has
mass
volume
both mass and volume
only mass but not volume
