• #### Class 8 Science Study Material

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##### Air is

a) A good conductor of electricity and heat.
b) A poor conductor of electricity and heat
c) A good conductor of electricity but poor conductor of heat.
d) A good conductor of heat but poor conductor of electricity.

##### A glass rod after being rubbed with silk is placed on the ground for sometime. If `A` in the figure below is touched by the glass rod, the gold foils will

a) Attract each other.
b) Repel each other.
c) Remain still
d) Vibrate periodically

##### Electric current is

a) Static charges
b) Flow of charges.
c) Heat flow.
d) Accumulation of charges.

##### A device used to detect whether an object is charged or uncharged is

a) Seismograph.
b) Electron-microscope.
c) Electroscope
d) Ammeter.

##### Earthing is provided in buildings to protect us from

a) Damage caused by earthquakes
b) Damage caused by floods.
c) Excessive heat.
d) Electrical shocks

##### Separation of charges during thunderstorms is caused due to

a) Vigorous upward movement of air current.
b) Vigorous downward movement of air current
c) Vigorous upward movement of water droplets.
d) Saturation of water vapour in clouds.

##### During the formation of thunderstorms, the air currents move upward, while the water droplets move downward. These vigorous movements cause separation of charges.

a) Negative and positive charges.
b) Negative charges of clouds.
c) Positive charges of clouds.
d) Water droplets of clouds

##### In the figure below, `A` is

a) A conductor.
b) An insulator.
c) A semi conductor.
d) A spherical coke.

##### In the figure below, `A` is made up of wood. A glass rod is rubbed with silk and is placed on `A`. The two gold foils will

a) Attract each other.
b) Repel each other.
c) Remain still.
d) Vibrate periodically.

##### Earthquakes occur

a) All the time, at the seismic zones only.
b) Occasionally all over the earth.
c) Occasionally at the seismic zones only.
d) All the time, all over the earth.

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