Which is used to investigate the properties of electron beam:
LDR
Electroscope
Proton gun
Electron gun
The property of substance, which opposes the flow of current through it is called:
Resistance
Reactance
Resistivity
None
The intensity level of whispering is:
20 dB
30 dB
40 dB
50 dB
The power of small fan is:
40 W
50 W
60 W
80 W
If the displacement in spring is ‘x’ of mass “m” attached with a spring then restoring force is:
F=ma
F=kx
F=-kx
F= m/a
