The sound level of rustling of leave is:
1 dB
20 dB
30 dB
10 dB
In C.R.O grid is always connected with potential:
Negative
Positive
High positive
Zero positive
1 Pico farad is equal to:
10-9F
1012F
10-12F
10-6F
The energy is transferred from one place of another:
through matter
through waves
both a and b
through vacuum
Sound waves having frequency higher than 20,000 Hz are called:
Ultrasonic
Infrasonic
Audible
Echo
Which of the following is a method of energy transfer:
Conduction
Radiation
Wave motion
All of these