CURRENT ELECTRICITY QUIZ

The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is

0.5

1

1.5

0.6

TRUE ANSWER : ?
YOUR ANSWER : ?

If the efficiency of a machine is to be high, what should be low?

Losses

Input power

kWh consumed

True component of power

TRUE ANSWER : ?
YOUR ANSWER : ?

The rating of a fuse wire is always expressed in

kWh

Ampere-hours

Ampere-volts

Amperes

TRUE ANSWER : ?
YOUR ANSWER : ?

The minimum charge on an ion is

None of these

Equal to the atomic number of the atom

Equal to the charge of an electron

Equal to the charge of the number of electrons in an atom (#) zero

TRUE ANSWER : ?
YOUR ANSWER : ?

The resistance of a conductor varies inversely as

Are of cross-section

Resistivity

Temperature

Length

TRUE ANSWER : ?
YOUR ANSWER : ?

Out of the following which is not a poor conductor?

Copper

Cast iron

Tungsten

Carbon

TRUE ANSWER : ?
YOUR ANSWER : ?

The substances which have a large number of free electrons and offer a low resistance are called

Insulators

Conductors

Semi-conductors

Inductors

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is the best material for making connecting wires?

Copper

Nichrome

Manganin

Constant

TRUE ANSWER : ?
YOUR ANSWER : ?

With rise in temperature the resistance of pure metals

Increases

Decreases

Remains constant

First increases and then decreases

TRUE ANSWER : ?
YOUR ANSWER : ?

A rheostat differs from potentiometer in the respect that it

Has higher wattage rating

Offers large number of tapping

Has large number of turns

Has lower wattage rating

TRUE ANSWER : ?
YOUR ANSWER : ?

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