CBSE Questions for Class 8 Physics Some Natural Phenomena Quiz 3 - MCQExams.com

When body losses electrons it acquires:
  • positive charge
  • negative charge
  • partially positive charge
  • partially negative charge
When a charge passes from a charged object to earth, the process is called:
  • Earthing
  • Lightning
  • Electroscope
  • None of these
What will be the nature of charge on the uncharged aluminium foil strip of electroscope when a negatively charged body is brought in contact with it?
  • Positive
  • Neutral
  • Negative
  • Unpredictable
When a neutral body is charged by bringing it near to the charged body, the process is called :
  • charging by conduction.
  • charging by induction.
  • charging by rubbing.
  • all of the above.
What will be the nature of charge on the metal paper clip of electroscope when a positively charged body is brought in contact with it?
  • Positive
  • Negative
  • Partially negative
  • None of the above
The nature of charge on the object can be detected by:
  • Microscope
  • Electroscope
  • Electrometer
  • Telescope
The process of transferring of charge from a charged object to the Earth is called:
  • lightning
  • thundering
  • earthing
  • all of the above
When a foil strips get touched by your hand, it loses charge to the Earth through your body. This process is also referred to as ________.
  • earthing
  • discharging
  • both A and B
  • none of the above
_________ is commonly used to make a lightning conductor.
  • Carbon
  • Copper
  • Sodium
  • None of the above
Which of the following is permissible during a thunderstorm?
  • Using a telephone having cord
  • Using a mobile phone
  • Taking a bath under running water
  • Standing under a tree
The device that is used to protect buildings from the effects of lightning is:
  • transformer
  • transducer
  • electrode
  • lightning conductor
Why to squat low on the ground during thunderstorm?
  • You dont have any safe place
  • To make yourself smallest target
  • Your in open field
  • All of the above
In the process of earthing, how does charges get discharged to Earth?
  • Through some conductor
  • Directly to the Earth
  • Through transformer
  • None of the above
Why earthing is important?
  • To protect us from electrical shocks.
  • Transfers charge from a charged body to the Earth.
  • Both A and B.
  • Neither A nor B.
When you are in open field or open area and do not have any safe places to hide during thunderstorm what should be done?
  • Make yourself smallest target.
  • Squat low on the ground.
  • Place your hands on your knees with head between the hands.
  • All of the above.
Why bathing is avoided during thunderstorm?
  • To avoid contact with electric wires
  • To avoid contact with water
  • To avoid contact with running water
  • All of the above
Which of the following will not cause any harm to us during thunderstorm?
  • Using phones with cord.
  • Switching off electric light.
  • Plugging in electrical appliances.
  • All will cause harm.
What should be the length of the metal rod used as lightning conductor?
  • Shorter than the walls of the building.
  • Same length or equals.
  • Taller than the walls of the building.
  • Nothing specific, can be of any length.
________ is the indication to rush for safer place.
  • Thunder
  • Rain
  • Clouds
  • All of the above
During lightning which of the following is not a safe place?
  • In car
  • Bus stop
  • Inside a house
  • Open field
If you are travelling by car during thunderstorm which place is safe?
  • Under a tree
  • Near street light
  • Elevated places
  • None of the above
Why it is not recommended to touch water metal-pipe lines, electric wires during thunderstorm?
  • They are good conductors thus may carry charges.
  • They are insulators and never carry charges.
  • They may store charges.
  • This is a myth.
During lightning, the _______ provides an easy route for the transfer of _______ charges to the ground.
  • Metallic rod, only positive
  • Plastic rod, only negative
  • Metallic rod, electric
  • Plastic rod, electric
What happens when the lower end of the lightning conductor is not properly buried in the ground?
  • No earthing
  • Building are protected
  • Damage to building and even life
  • Both a & c
Why should the height of lightning conductor is more than that of the walls of the building?
  • Lightning get attracted towards the tallest target
  • Lightning get repelled
  • Lightning get attracted by the walls of building
  • None of the above
When you are in forest during lightning which is safe place?
  • Open field
  • Under tall trees
  • Under short trees
  • None of the above
To provide proper earthing, lower end of the lightning conductor should be
  • buried deep into the ground
  • slightly buried into the ground
  • only touching the ground lightly
  • a few inches above the ground
The uppermost layer of the Earth is:
  • a huge single piece
  • fragmented
  • in two large pieces
  • none of the above
Fill in the blank:

The uppermost layer of the Earth is called _______.
  • mantle
  • outer core
  • crust
  • none of the above
Which of the natural phenomena are possible to occur due to earthquake?
  • Tsunami
  • Floods
  • Landslides
  • All of the above
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