Science quiz

Number of electrons constituting one coulomb of charge-

• 1.6 X 10¹⁹ electrons

• 8.25 X 10¹⁸ electrons

• 6.25 X 10¹⁸ electrons

• 6.25 + 10¹⁹ electrons

SI unit of electrical potential difference is

• Ampere

• Bolt

• Volt

• Rheostat

Direction of current is taken as

• Opposite to flow of charge

• Opposite to flow of current

• Along with charge

• Opposite to flow of electrons

What is the maximum resistance which can be made using five resistors each of 1/5ohms.

• 1/5

• 10

• 5

• 1

Electrical resistivity of a given metallic wire is depends upon

• It's Thickness

• it's Length

• It's shape

• Nature of the material

If the current through a resistor is increased by 100% without any change in temperature, the increase in power dissipated will be

• 100%

• 200%

• 300%

• 400%

Unit of electric power may also beexpressed as

• Volt ampere

• Kilowatt/hour

• Watt/second

• Joule /second

• Maximum in (i)

• Maximum in (ii)

• Maximum in (iii)

• Same in all cases

Ammeter is connected in

• Always in Series

• Always in Parallel

• May be in both

• None of these

Formula of electrical resistivity

• R=pl/A

• R=v/q

• R=l/A

• R=w/t