SI unit of electric potential is:
watt
volt
coulomb
joule
Why household appliances should be connected in parallel with the voltage source:
To increase the resistance of the circuit
To decrease the resistance of the circuit
To provide each appliance the same voltage as the power source
To provide each appliance the same current as the power source
In a vacuum all electromagnetic waves have the same:
Speed
In C.R.O grid is always connected with potential:
Negative
Positive
High positive
Zero positive
An object gains excess negative charge after being rubbed against another object, which is:
Neutral
Negatively charged
Positively charged
Either, a, b or c
In totally reflecting prism one angle is of 90°, and other two angles are of:
30°,30°
45°,90°
45°,45°
40°,40°
