CBSE Science Class 8
Some Natural Phenomena
Some Natural Phenomena - Chapter Wise CBSE Solved Question and Answer Based On NCERT
Very Short Q&A:
Q1: Name some destructive natural phenomena.
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Ans:
Earthquake, lightning, cyclones etc.
Q2: ________________ is caused by the accumulation of charges in the cloud.
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Q3: Name the scientist who showed for the first time that lightening and spark from our clothes are essentially the same phenomena.
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Q4: Scientific _____________ are the result of handwork by many people
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Q5: A charged balloon _______________ another charged balloon.
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Q6: A charged balloon __________________ a charged refill.
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Q7: Charges of same kind attract each other. True/False.
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Q8: Charges of different kind attract each other. True/False.
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Q9: What kind of electric charge is generated by rubbing of two different objects?
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Q10: What is an electroscope?
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Ans:
Electroscope is a device used to detect whether a body is charged or not.
Q11: What kind of conductor is used to transfer electrical charge from a charged object to another?
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Q12: Define earthing.
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Ans:
The process of transfer of charge from a charged object to earth is called earthing.
Q13: What is the main purpose of providing earthing in buildings?
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Ans:
To protect us from electrical shocks due to any leakage of electrical current.
Q14: During lightning and thunderstorm open place is safe or not?
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Q15: Rena is in a forest, suddenly thunderstorm came, what she should do now?
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Ans:
She should take shelter under shorter tree in the forest.
Q16: Neha is in an open field, suddenly thunderstorm came, what she should do now?
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Ans:
She should stay far away from all trees in the forest and also from poles or other metal objects.
Q17: During a thunderstorm Raj has to make an urgent call, what according to you he should use landline phone with cords or cordless phone?
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Q18: Bathing should be avoided during thunderstorm to avoid contact with __________________.
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Q19: Name the device used to protect buildings from the effects of lightning.
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Ans:
lightning conductors
Q20: What do you mean by earthquake?
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Ans:
An earthquake is the result of a sudden release of energy in the earth's crust that creates seismic waves.
Q21: Name the place where major earthquake occurred in 2005 in India.
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Ans:
Uri and Tangdhar towns of North Kashmir.
Q22: Name the place where major earthquake occurred in 2001 in India.
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Ans:
Bhuj district of Gujarat.
Q23: Earthquakes can cause floods and ___________________.
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Q24: A major Tsunami occurred in the Indian Ocean on _____________________.
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Q25: Outermost layer of earth is called
- Menarche
- Menopause
- Menstruation
- All of the above
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Q26: Innermost layer of earth is called ____________________.
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Q27: Define plate.
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Ans:
The outer most layer of earth is not in one piece, it is fragmented and each fragment is called a plate.
Q28: Most of the earthquakes are caused by the movement of earth’s__________________.
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Q29: Name some places in India where earthquakes are more likely to occur.
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Ans:
Kashmir, western and central Himalayas, the whole of north- east, Rajasthan, Rann of Kuch and Indo- Gangetic plane.
Q30: What is the magnitude of highly destructive earthquakes on a Richter scale?
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Q31: What was the magnitude of Bhuj and Kashmir earthquake on the Richter scale?
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Q32: What are the causes of tremors on the earth?
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Ans:
Because of volcanic eruptions, or because of a meteor hitting the earth or an underground nuclear explosion.
Q33: Name the wave produced by tremors?
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Q34: Name the instrument used record the wave produced by tremors.
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Q35: In highly seismic areas, roofs should be kept _________________.
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Q36: Which of the following cannot be charged easily by friction?
- A copper rod
- A plastic scale
- A woollen cloth
- An inflated balloon
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Q37: What kind of electric charge is acquired by a glass rod rubbed with silk cloth?
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Q38: What kind of electric charge is acquired by a plastic comb rubbed with dry hair?
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Q39: A negatively charged object attracts another charged object kept close to it. Name the nature of charge on the other object?
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Q40: A negatively charged object repels another charged object kept close to it. Name the nature of charge on the other object?
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