CBSE Questions for Class 8 Physics Some Natural Phenomena Quiz 9 - MCQExams.com

An ebonite rod can be charged by touching it with a charged copper rod.
  • True
  • False
To find whether a body is charged or not, an uncharged electroscope is used.
  • True
  • False
To find whether the charge on a body is positive or negative, an uncharged electroscope is used.
  • True
  • False
Two objects when rubbed together, get charged. The charges on them are:
  • Equal and opposite
  • Equal and similar
  • Unequal and similar
  • Unequal and opposite
When an ebonite rod is rubbed with fur, the rod acquires
  • positive charge
  • negative charge
  • no charge
  • none of the above
When a glass rod is rubbed with dry silk cloth, the charge acquired by the silk cloth is
  • Positive
  • Negative
  • Both positive and negative
  • none of the above
What happens when two bodies are rubbed together? 
  • They get equal charged but the same nature
  • They get equal charged but the opposite nature
  • Nothing happend with rubbing
  • None
What are the weak zones around the boundaries of plates underneath Earth, which are prone to slide and cause earthquakes?
  • Fault zone
  • Eruption zone
  • Explosive zone
  • Sliding zone
Where is the lower end of a lightning conductor fixed in the building?
  • at the top
  • at a window
  • at the base
  • in the ground
An ebonite rod is rubbed with fur. The charge on the ebonite rod is ______ and the charge on the fur is _______.
  • Negative, Positive
  • Positive, Negative
  • Negative, Negative
  • Positive, Positive
What is the cause for the streaks of bright light and sound produced during lightning?
  • Meeting of positive charges
  • Meeting of negative charges
  • Meeting of like electric charges
  • Meeting of unlike electric charges
During the thunderstorm, ________ move upwards while ________ move downards.
  • Water droplets, air currents
  • Air currents, charges
  • Air currents, water droplets
  • Water droplets, charges
Electric charges formed by rubbing are _____.
  • moving
  • static
  • dynamic
  • none of these
Choose the correct option that shows the rod and fur after charging
Choose whether true or false:-
Earthing prevents shocks in buildings.
  • True
  • False
Lightning is caused in the atmosphere primarily due to
  • Opposite charges accumulation at edges of a cloud.
  • Discharge  between two similarly charged clouds.
  • Discharge between one charged and one neutral cloud.
  • None of these
What is a positive charge?
  • The charge acquired by a glass rod when it is rubbed with silk
  • The charge acquired by silk when it is rubbed with a glass rod
  • The charge acquired by plastic straw when it is rubbed with a silk
  • None of these
In an electroscope, if aluminium strips are replaced by plastic strips, and a charged object is touched with the metal top of the electroscope:
  • the plastic strips will diverge
  • the plastic strips will not diverge
  • one strip will move away while other will remain
    same.
  • the plastic strips will come more closer.
Why is Earthing done in buildings?
  • To protect us from electric shocks
  • To give extra strength to the building
  • To transfer extra current to air
  • None of these
Tremors or earthquakes on the Earth can also be caused when a volcano erupts, or a meteor hits the Earth or an underground nuclear explosion is carried out. 
  • True
  • False
How does charges separate during a thunderstorm?
  • Due to rubbing of air particles
  • Due to movement of air
  • Due to movement of air current and water droplets
  • None of these
The positive charges are collected at ________  of clouds and the negative charged are collected at ________ of the cloud.
  • Upper edges; lower edges
  • Lower edges; upper edges
  • Lower edges; center
  • Upper edge; center
Why does air (a poor conductor of eletricity) allows the flow of electrical charges?
  • Air becomes a conductor for lightning
  • Air is not able to resist the flow of charges when very high charge is accumulated
  • The charges get heavily accumulated
  • None of these
The process of electric discharge can't occur between?
  • Two or more clouds
  • Between clouds and Earth
  • Between air and clouds
  • None of these
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