TV set receives waves through
Receiver
Local antenna
Picture tube
Speaker
Electric current in metal wires is due to the flow of
protons
neutrons
electrons
orbits
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
Which of the following waves ca be formed by rapidly changing electric and magnetic fields?
Oscillating waves
Sound waves
Electro magnetic waves
Short waves.
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
The electro magnetic waves was invented by
Marconi
Marx Plank
Maxwell
Graham Bell
Matter has
mass
volume
both mass and volume
only mass but not volume
J.J. Thomson discovered electron in
1892
1893
1864
1895
A radio set receives electro magnetic waves and converts them in to sound waves back with the help of
antenna
receiver
speaker
tuner
The discovery of electrons lead to a new branch of physics called
Optics
thermal physics
nuclear physics
electronics
