Waves transfer:
Energy
Wavelength
Velocity
Instrument used for detecting and testing the nature of charge on a body is called:
Incubator
Spectroscope
voltmeter
electroscope
The particles emitted from a hot cathode surface are:
Positive ions
Negative ions
Protons
Electrons
Static electricity can be generated by:
Lubrication
Friction
Motion
Smaller the objects
A device which has two ways communication is:
Television
Radio
Hard disk
Mobile phone
Image formed on a camera is:
Real, inverted, and diminished
Virtual, upright and diminished
Virtual, upright and magnified
Real, inverted and magnified