CBSE Questions for Class 8 Physics Some Natural Phenomena Quiz 5 - MCQExams.com

Which of the following descriptions apply to a lightning conductor?
  • It is usually fixed at the top of tall buildings
  • It has several metal stripes connected to a copper strip
  • One end of the conductor is buried deep under the ground
  • All of the above
State whether given statement is True or False.
Charges are incapable of passing from clouds to lightning rod.
  • True
  • False
Lightning rods are placed on houses to reduce the risk of lightning damage to low.
  • True
  • False
When an object is rubbed by another, the objects get charged - one as positive and another as negative. In electrostatic series:
  • the one being positively charged comes first.
  • the one being negatively charged comes first.
  • both the objects come together.
  • objects appear as per their atomic numbers.
Lightning rod can be most effective if it draws charge from lowest cloud by method of contact. This statement is True/ False?
  • True
  • False
State whether given statement is True or False.
Lightning is most likely to strike small buildings closer to the ground.
  • True
  • False
What causes lightning?
  • Excessive electric charge in the atmosphere
  • Increased chemical energy in the atmosphere
  • Attraction between two oppositely charged clouds
  • All of the above
State whether the given statement is True or False :
Whenever there is a lightning, there is an earthquake. 
  • True
  • False
What is earthing?
  • Passage of large electric current resulting from a lightning into the earth
  • Burying electric charge into the earth
  • Preventing electric charge from entering the earth
  • None of the above
The fact that lightning and spark are essentially the same phenomena, was discovered in:
  • 1882
  • 1752
  • 1770
  • 1802
When we can observe sparks on an electric post?
  • When there is huge rain
  • When there is thunderstorm
  • When wind blows and shakes the wire
  • All of the above
When a person combs his hair static electricity is sometimes generated by:
  • friction between comb and hair resulting in flow of electrons.
  • induction between comb and hair.
  • conducting property of hair.
  • contact between comb and hair resulting in a charge.
Which of the following causes electric sparks?
  • Wind blowing and shaking electric poles.
  • When amber rubbed with fur.
  • When we take off woollen and polyester clothes.
  • All of the above.
How can we be safe when there is occurrence of lightning?
  • Taking shelter inside building or house
  • When travelling through car or bus, making sure windows and doors are shut
  • If in forest, taking shelter under short trees
  • All of the above
When two positively charged materials will be placed close together:
  • they will repel each other.
  • they will become negative.
  • they will attract each other.
  • no interaction / change will be observed.
Lightning is:
  • caused by accumulation of charges in cloud
  • caused by dispersion of charges in cloud
  • caused by rotation of charges in cloud
  • none of the above
What are may happen if a building does not have earthing?
  • Lightning may strike a building due to the opposite charge causing fire or damage to the building
  • In the rainy season, water increases the chances of lightning striking a building causing damage
  • Both A & B
  • None of the above
Inflate two balloons. Hang them in such a way that they do not touch each other. Rub both balloons with woollen cloth and release them. Then:
  • both balloons attract each other.
  • both balloons repel each other.
  • both balloons remain at same position.
  • none of the above happens.
What happens when charged glass rod is brought near a charged plastic straw after being rubbed with silk?
  • Repulsion is observed.
  • Attraction is observed.
  • No reaction is observed.
  • None of the above is observed.
When charges move, they constitute:
  • energy
  • light
  • power
  • electric current
The electrical charges generated by rubbing are:
  • dynamic
  • static
  • neutral
  • none of the above
What happens when a used plastic refill is rubbed with polythene?
  • Only refill gets charged.
  • Refill and polythene gets charged.
  • Only polythene gets charged.
  • Both gets discharged.
What is the approximate lightning frequency?
  • 1.4 billion flashes per year
  • 1.4 billion flashes per month
  • 1.5 billion flashes per year
  • 1.6 billion flashes per year
How does lightning occur between two charges within the cloud?
  • When two negative charges grow large enough then a giant lightning sparks occurs
  • When positive and negative charges grow large enough then a giant lightning sparks occurs
  • When two positive charges grow large enough then a giant lightning sparks occurs
  • None
Instrument used to measure earthquake is known as :
  • Typanic graph
  • Seismograph
  • Quake graph
  • Quake meter
What is meant by lightning?
  • It is sudden electrostatic discharge during an electrical storm between electrically charged regions of cloud.
  • It is sudden electrostatic discharge during an electrical storm between non-electrically charged regions of cloud.
  • It is unsudden electrostatic discharge during an electrical storm between electrically charged regions of cloud.
  • None of the above
Electroscope is used
  • to detect and test small electric charges
  • to calculate the amount of electric charge flowing through the conductor in the given interval of time
  • to find out the presence of antimatter
  • to test the presence of magnetic field
The movement of Earth's plates causes
  • Lightening
  • Cyclons
  • Earthquake
  • Thunderstorms
Lightning is also known as :
  • Mechanical energy.
  • Electric discharge.
  • Potential current.
  • Kinetic current.
When there is lightning and 
a) You are in a jungle ,go under a tall tree.
b) You are in a jungle,go under a canopy of small trees and bushes.
c) You are out in the open,crouch on your feet,do not stand up or lie on the ground.
d) You are in an open field,stay there rather than go inside a completely covered building.Of these the good strategies are :-  
  • B and C
  • A and C
  • A,B and C
  • A,C and D
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