Science - Electricity

How is a voltmeter connected in the circuit to measure the potential difference between two points?

• According to the situation either series or parallel

• Series

• Parallel

• None of the above

SI unit of electric current is ___________.

• Ampere

• Ohm

• Coulomb

• Volt

Ammeter is used to measure ___________.

• Resistivity

• Electric Current

• Voltage

• Resistance

Ohm's law is applicable only when ___________.

• Temperature remains constant

• Temperature increases

• Temperature decreases

• None of the above

What is the SI unit of electric charge?

• Coulomb

• Ampere

• Volt

• Ohm

Calculate the amount of charge that would flow in 1 hour through the element of an electric bulb drawing a current of 0.2 A. [Use I = Q/t]

• 720 C

• 700 C

• 300 C

• 320 C

The solution which conducts electricity is known as ____________.

• Insulator

• Electrolyte

• Conductor

• None of the Above

An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, power consumed will be ---------------. [Use P = (V X V)/R]

• 100 W

• 25 W

• 75 W

• 50 W

SI unit of resistivity (specific resistance) is ____________.

• Ohm meter

• Volt

• Ampere

• Ohm

An electric iron of resistance 20 ohm takes a current of 5 A. Calculate the heat developed in 30 s. [Use H = I x I x R x t]

• 2000 joules

• 30000 joules

• 15000 joules

• 1000 joules