the unit of frequency is:
hertz
vibration per second
cycle per second
all a, b and c
The waves in which particles of the medium vibrate parallel to the direction of waves are called:
Longitudinal waves
Transverse waves
Electromagnetic waves
Both a and c
an electrolytic capacitor is used to store large amounts of charge at:
low voltage
high voltage
neutral
positive
Each volt of lightening contains energy:
4x106 joules
1000 joules
1000 million joules
10 joules
In C.R.O grid is always connected with potential:
Negative
Positive
High positive
Zero positive