CLASS 8 SCIENCE

An electroscope is a device which is used to find if an object is

• charged

• magnetised

• hot

• free of cracks

The outermost layer of earth is called

• mantle

• outer core

• inner core

• crust

When an uncharged body B is brought into contact with a positively charged body A:

• A loses its charge

• B acquires positive charge

• B acquire no charge

• B acquires negative charge

The movement of the earth’s plates causes

• cyclones

• lightning

• earthquakes

• thunderstorms

Which of the following cannot be charged easily by friction?

• A plastic scale

• A copper rod

• An inflated balloon

• A woolen cloth

When a glass rod is rubbed with a piece of silk cloth the rod

• becomes positively charged while the cloth has a negative charge.

• and the cloth both acquire positive charge.

• and the cloth both acquire negative charge.

• becomes negatively charged while the cloth has a positive charge.

The device used to measure intensity of earthquakes is

• seismograph

• odometer

• hygrometer

• anemometer

Major earthquakes are less likely to occur in

• North East India

• Rajasthan

• Rann of Kutch

• Chhattisgarh

When was lightening discovered?

How is lightening useful?