RPSC Quiz

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

Ohm’s law is not applicable to

A resistance having rating 10 ohms 10 W is likely to be a

Resistance of a material always decreases if

The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms what is the resistance of the other ?

With rise in temperature the resistance of semi-conductors

Which is the best conductor of electricity ?

Insulating materials have the function of

Which one of the following does not have negative temperature co-efficient ?

Two resistors are said to be connected in series when

For which of the following ‘ampere second’ could be the unit ?

Which of the following quantities remain the same in all parts of a series circuit ?

Varistors are

When electric current passes through a metallic conductor its temperature rises. This is due to

Which of the following statement is true both for a series and a parallel D.C. circuit?

An electric filament bulb can be worked from

All of the following are equivalent to watt except

Resistance of a tungsten lamp as applied voltage increases

Electric current passing through the circuit produces

A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb the heater output will

In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes using same supply mains

Which of the following materials has a negative temperature co-efficient of resistance?

With rise in temperature the resistance of pure metals

The resistance of a conductor varies inversely as

Whether circuit may be AC. or D.C. one following is most effective in reducing the magnitude of the current.