The wireless system was invented by
Marconi
Graham Bell
Edison
Newton
Which of the following waves ca be formed by rapidly changing electric and magnetic fields?
Oscillating waves
Sound waves
Electro magnetic waves
Short waves.
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
Radio works with the help of
electro magnetic waves
sound waves
light waves
magnetic waves
The atomic number of an atom is equal to its
number of nucleus
number of neutrons
number of electrons
atomic mass
The electro magnetic waves was invented by
Marx Plank
Maxwell
Electric current in metal wires is due to the flow of
protons
neutrons
electrons
orbits
TV set receives waves through
Receiver
Local antenna
Picture tube
Speaker
A radio set receives electro magnetic waves and converts them in to sound waves back with the help of
antenna
receiver
speaker
tuner
J.J. Thomson discovered electron in
1892
1893
1864
1895
