Micro waves are used in:
Radio
Television
Mobile phone
All of these
Human skin, in dry conditions, has a resistance of:
20,000 ohm
100,000 ohm
30,000 ohm
2000 ohm
J.J Thomson observed deflection of cathode rays in:
1895
1896
1897
1998
A data storage device is:
Printer
Hard disk
Monitor
CPU
The sensation of sound persists in our brain for:
0.1 sec
0.01 sec
1 sec
10 sec
The mirror whose inner surface is reflecting is called:
Concave mirror
Convex mirror
Mirror
Lens