WBBSE Solutions For Class 8 School Science Chapter 5 Analysis Of Natural Phenomena Review Questions

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Chapter 5 Analysis Of Natural Phenomena Review Questions MCQs

 

Question 1. The potential difference between the sky and the surface of the earth is maintained by

  1. Earthquake
  2. Storm
  3. Volcanic eruption
  4. Lightning

Answer: 4. Lightning

Question 2. The water droplets moving upwards generally accumulate

  1. Positive charge
  2. Negative charge
  3. No charge
  4. None of these

Answer: 1. Positive charge

Question 3. The water droplets moving downwards accumulate

  1. Negative charge
  2. Positive charge
  3. Both types of charge
  4. No charge

Answer: 1. Negative charge

Question 4. The approximate number of thunderstorms occurring per day all over the earth

  1. 30000
  2. 40000
  3. 50000
  4. 10000

Answer: 2. 40000

Read And Learn More WBBSE Solutions For Class 8 School Science Review Questions

Question 5. The potential difference that exists between the surface of the earth and the sky (which is approximately 50 km from the sea level) is approximately

  1. 3,50,000 Volt
  2. 4,00,000 Volt
  3. 4,50,000 Volt
  4. 3,00,000 Volt

Answer: 2. 4,00,000 Volt

Question 6. If one is forced to remain outdoors during a thunderstorm

  1. One should take shelter beneath a tall tree
  2. One should squat low on the ground
  3. One should stand straight in an elevated position
  4. One should lie down on the ground

Answer: 2. One should squat low on the ground

Question 7. The rod of the lightning conductor should be made up of

  1. Good conductor of electricity
  2. Insulator
  3. Bad conductor of electricity
  4. A semi-conducting material

Answer: 1. Good conductor of electricity

Question 8. During a thunderstorm the household electrical appliances

  1. Should be switched off
  2. May be used without any problem
  3. Should be switched off and unplugged
  4. None of these

Answer: 3. Should be switched off and unplugged

Question 9. Through the lightning conductor

  1. The current passes to the ground
  2. The current goes back to the sky
  3. The current goes back to the thunderclouds
  4. The current enters the building’s mass

Answer: 1. The current passes to the ground

Question 10. An epidemic

  1. Spreads rapidly
  2. Spreads slowly
  3. Does not spread
  4. Is of non-infectious type

Answer: 1. Spreads rapidly

Question 11. Pandemic diseases

  1. Are localized in an area
  2. Are localized in a country
  3. Spread to different countries
  4. Occurs regionally

Answer: 3. Spread to different countries

Question 12. Influenza and pneumonia are

  1. Point source epidemics
  2. Cyclical epidemics
  3. Seasonal epidemics
  4. Propagated epidemics

Answer: 3. Seasonal epidemics

Question 13. Diabetes is

  1. Communicable
  2. Non-communicable
  3. Rarely communicable
  4. Infectious

Answer: 2. Non-communicable

Question 14. Cholera is caused by

  1. Bacteria
  2. Virus
  3. Protozoa
  4. Rodent

Answer: 1. Bacteria

Question 15. Malaria is transmitted via the bites of

  1. Dog
  2. Sandfly
  3. Infected female anopheles mosquitoes
  4. Leech

Answer: 2. Sandfly

Question 16. The full form of aids is

  1. Acquired intelligence deficiency syndrome
  2. Alternative immune development syndrome
  3. Acquired immune development syndrome
  4. Acquired immunodeficiency syndrome

Answer: 4. Acquired immunodeficiency syndrome

Question 17. Plague is a bacterial disease, caused by

  1. Yersinia pestis
  2. Plasmodium
  3. Mosquito
  4. Ascaris

Answer: 1. Yersinia pestis

Question 18. Smallpox is

  1. Very common in India
  2. Globally eradicated
  3. Not found in India
  4. Not yet eradicated

Answer: 2. Globally eradicated

Question 19. Kala azar is spread by

  1. Mosquito
  2. Sandfly
  3. House fly
  4. Rat

Answer: 2. Sandfly

Question 20. Severe diarrhoea leads to

  1. Weight loss
  2. Loss of appetite
  3. Fluid loss
  4. Brain damage

Answer: 3. Fluid loss

Question 21. Hepatitis causes inflammation of

  1. Liver
  2. Lung
  3. Brain
  4. Kidney

Answer: 1. Liver

Question 22. Hiv is a

  1. Bacteria
  2. Virus
  3. Poison
  4. Protozoa

Answer: 2. Virus

Question 23. Which one of the following has a long-term effect on the health of an individual?

  1. Diarrhoea
  2. Diabetes
  3. Flu
  4. Dengu

Answer: 2. Diabetes

Question 24. Aids can not be transmitted by

  1. Sexual contact
  2. Breastfeeding
  3. Handshaking
  4. Blood transfusion

Answer: 3. Handshaking

Question 25. Infectious agents are spread through

  1. Air
  2. Water
  3. Vectors
  4. All of these

Answer: 4. All of these

 

Chapter 5 Analysis Of Natural Phenomena Fill In The Blanks

Question 1. The thunderstorm and its lightning act like a __________which keeps charging the earth’s surface with a negative charge.
Answer: Battery

Question 2. Just before the rain comes, there is a little __________wind which gives us a warning about the coming storm.
Answer: Cold

Question 3. Thunderstorms occurring per day throughout the world are charging the earth with an average of __________ ampere.
Answer: 1800

Question 4. The potential difference between the earth and the sky is approximate __________ volt.
Answer: 4,00,000

Question 5. The water droplets moving upwards generally accumulate __________ charge while the water droplets moving downwards accumulate __________ charge.
Answer: Positive;Negative

Question 6. __________ phones should not be used during a thunderstorm.
Answer: Land

Question 7. The flow of current occurs through a conductor when __________ exists between its two ends.
Answer: potential difference

Question 8. An is the rapid spread of infectious disease to a large number of people in a given population.
Answer: Epidemic

Question 9. If an epidemic spreads to other countries or continents and affects a substantial number of people, it may be termed a __________
Answer: Pandemic

Question 10. __________ transmission is the spread of infection by droplet nuclei or dust in the air.
Answer: Airborne

Question 11. Cholera is an acute intestinal infection caused by ingestion of food or water contaminated with the bacterium __________ .
Answer: Vibrio cholera

Question 12.__________ is caused by a protozoan parasite called Plasmodium.
Answer: Malaria

Question 13. Severe dengue is also known as dengue __________ fever.
Answer: Hemorrhagic

Question 14. Bubonic plague can be successfully treated with __________.
Answer: Antibiotics

Question 15. Worldwide immunization stopped the spread of __________ three decades ago.
Answer: Smallpox

Question 16. __________ is the second largest parasitic killer in the world.
Answer: Kala-azar

Question 17. Kala-azar is also known as __________ fever.
Answer: Dumdum

Question 18. Diarrhoea is the passage of 3 times or more loose or liquid __________ per day.
Answer: Stools

Question 19. Tuberculosis most commonly affects the __________
Answer: Lungs

Question 20. __________ is a viral infection that affects mainly the nose, throat, bronchi and/occasionally, lungs.
Answer: Influenza

Question 21. In 1976, British scientist __________ used a cow-pox virus to create resistance power in the human body against smallpox.
Answer: Edward Jenner

Question 22. The meaning of diarrhoea is __________
Answer: ‘To flow’

 

Chapter 5 Analysis Of Natural Phenomena Identify As “True Or False”

Question 1. When an electric train moves, sometimes the pantograph gets disconnected from the overhead electrical lines. The electric sparks occur.
Answer: True

Question 2. In 1752, Benjamin Franklin proved that the spark coming from woollen clothes during the winter season (which is due to the generation of static charges) and lightning is basically the same phenomenon.
Answer: True

Question 3. One must take shelter inside a house and should not remain in the open verandah during a thunderstorm.
Answer: True

Question 4. One can go out with an umbrella during a thunderstorm.
Answer: False

Question 5. One can use land phones during a thunderstorm.
Answer: False

Question 6. The use of running water coming through a pipe should be avoided during a thunderstorm.
Answer: True

Question 7. Lightning may also occur between one cloud and another cloud or between two parts of the same cloud.
Answer: True

Question 8. If one is forced to remain inside a forest during a thunderstorm, it is better to take shelter under tall trees.
Answer: False

Question 9. Clouds become charged due to the friction of clouds.
Answer: False

Question 10. The lightning conductor should be mounted at the top of the building.
Answer: True

Question 11. An epidemic is the rapid spread of an infectious disease to a large number of people.
Answer: True

Question 12. Diarrhoea diseases are more during winter seasons.
Answer: False

Question 13. In the human body, malaria parasites multiply in the kidneys.
Answer: False

Question 14. Plague is a viral disease, caused by Yersinia pestis.
Answer: False

Question 15. Smallpox has been globally eradicated.
Answer: True

Question 16. Malaria is more deadly than kala-azar.
Answer: True

Question 17. Severe diarrhoea leads to blood loss.
Answer: True

Question 18. TB most commonly affects the brain.
Answer: False

Question 19. The human immunodeficiency virus (HIV) is a retrovirus.
Answer: True

Chapter 5 Analysis Of Natural Phenomena Match The Column

 

1.

Column – A Column – B
A. Malaria 1. Lesihnania
B. Plague 2. Mycobacteruim
C. Kala Azar 3. Plamodium
D. Tuberculosis 4. Yersinia

Answer: A-3,B-4,C-1,D-2

 

 

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