Electricity Test 1

Conventionally, in an electric circuit the direction of electric current is taken as opposite to the direction of the flow of?

• Electrons

• Protons

• Neutrons

• None of these

A wire of resistance R is stretched to twice of its original length. What will be its new resistance?

• 4R

• R / 9

• 3R

• R / 3

A metalic wire of resistance 12 ohm is bent to form a square. What will be the resistance between the diagonal points?

• 12 ohm

• 24 ohm

• 6 ohm

• 3 ohm

A fuse wire is a wire of?

• Low resistance and low melting point

• High resistance and low melting point

• Low resistance and high melting point

• High resistance and high melting point

One kilowatt hour is equal to

• 36 x 10^5 J

• 36 x 10^3 J

• 36 x 10^-5 J

• 36 x 10^-3 J

What is the unit of resistivity?

• Ω

• Ωm2

• Ωm

• Ω/m

Ohm’s law states the relationship between which of theses two?

• Electric current and resistance

• Electric current and work

• Electric current and potential dierence

• Electric current and electric charge

Which element is used exclusively for the filaments of the bulbs ?

• Copper

• Aluminium

• Silver

• Tungsten

Ten identical wires each having resistance 1 ohm are connected in parallel. What will be the resistance of

the combination?

• 10 ohm

• 1 ohm

• 0.1 ohm

• 0.01 ohm

Under which of the following condition the resistivity does not change?

• The material is changed

• The temperature is changed

• The shape of the resistor is changed

• Both material and temperature are changed