How does sound travel from its source to your ear:
By changes in air pressure
By vibration in wires or strings
By electromagnetic waves
By infrared waves
battery is one of the source of:
heat
light
current
sound
The more negative potential of grid, the more electrons will be:
Attracted
Repelled
Attracted as well as repelled
Neither attracted nor repelled
Eight bits combine to form:
A byte
Megabyte
Kilobyte
Gigabyte
The A.C used in Pakistan has frequency:
60 Hz
30 Hz
50 Hz
130 Hz
The ray of light after reflection from concave mirror passes through:
Centre
Principal focus
Pole
Radius
What is fitted in telephone receiver:
Electromagnet
Diaphragm
Both a and b
None
The colour of live wire is:
Black or blue
Green or yellow
White or grey
Red or brown