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| 1 - | The unit of frequency is | Hertz |
| 2 - | The unit of resistance is | Ohm |
| 3 - | The device which makes or breaks a circuit is | Switch |
| 4 - | The path of an electric current is known as a | Circuit |
| 5 - | Device which opposes the flow of electric current is known as | Resistor |
| 6 - | Arc Lamp was invented by | C.F.Brush |
| 7 - | Television was invented by | J.L.Baird |
| 8 - | Transistor was invented by | J.Bardeen,W.Shockley and W.Brattain |
| 9 - | The unit of wavelength of light is | Angstrom |
| 10 - | A device which converts light into electricity is known as | Photo cell |
