Class 10 Physics - Electricity

WHICH DEVICE IS USED FOR MEASURING SMALL CURRENT ?

• VOLTMETER

• DOUBLE AMMETER {SPECIFIC}

• GALVANOMETER

• AMMETER

The equivalent resistance of the series combination of two equal resistances is S. When they are joined in parallel, the total resistance is “P”. If S = nP, what is the value of “n”?

• 2

• 1

• 4

• 3

• 6

According to ohms law,

• The resistance increases with the increases in current.

• The resistance increases with the increases in voltage.

• The resistance and current both increases wiTh the increases in voltage.

• The current increases with the increases in voltage.

kilowatt hour is unit of

• energy

• power

• momentum

• force

SI unit of resistivity (specific resistance) is ----------

• ohm

• ohm meter

• volt

• ampere

SI unit of resistance is ------------

• ohm

• volt

• ampere

• coulomb

An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, power consumed will be ---------------.

• 100 W

• 75 W

• 50 W

• 25 W

What is the direction of conventional current?

• positive terminal to negative terminal

• negative terminal to positive terminal

• depends on the condition

• none

Ohm's law is applicable only when ----------------

• temperature remains constant

• temperature increases

• temperature decreases

• Independent of temperature

Keeping the potential difference constant, the resistance of the circuit is halved, the current will become --------------

• four times

• half

• double

• one-third