The frequency of silent whistle is:
20,000 Hz – 25000Hz
2000 Hz – 2500Hz
200 KHz – 2000 Hz
25000 KHz
an additional wire used along with live and neutral wire is:
cable wire
earth wire
grip wire
hot wire
The value of refractive index of water is:
2.33
1.36
1.33
1.39
What is the power rating of a lamp connector to a 12 V source when it carries 2.5 A:
4.8W
14.5W
30W
60W
What is fitted in telephone receiver:
Electromagnet
Diaphragm
Both a and b
None