On this Page we have given West Bengal Class 8 English Medium Science Solution Chapter 5 Analysis of a Natural Phenomena Question and Answer for our Students of West bengal Class 8 English Medium. Hope this following Question Answer will help our Students.
West Bengal Class 8 | Science | Analysis of a Natural Phenomena
Q.(1) MCQ
1.) Lightning is most commonly observed during which season in our country?
a) Winter
b) Monsoon
c) Summer
d) Spring
Answer: Monsoon
2.) What causes the hair to straighten and create sparks when removing a woollen sweater in winter?
a) Friction
b) Heat
c) Moisture
d) Pressure
Answer: Friction
3.) the scientific reason behind the occurrence of sparks when two live electric wires are separated
a) Electrostatic discharge
b) Heat produced due to friction
c) Electric current flow
d) Potential difference between wires
Answer: Electrostatic discharge
4.) Identify the scientist who proved that lightning and the spark from clothes are essentially the same phenomena
a) Benjamin Franklin
b) Isaac Newton
c) Albert Einstein
d) Nikola Tesla
Answer: Benjamin Franklin
5.) What is an atom called when the number of protons exceeds the number of electrons?
a) Positive ion
b) Negative ion
c) Neutral atom
d) Charged atom
Answer: Positive ion
6.) The term used when an electron is released from an atom
a) Positive ion formation
b) Negative ion formation
c) Electric current flow
d) Potential difference creation
Answer: Negative ion formation
7.) It is the device that is in contact with the electric line on an electric train
a) Pentograph
b) Transformer
c) Capacitor
d) Insulator
Answer: Pentograph
8.) The reason for a spark to occur between the pentograph and the overhead electric line on an electric train
a) Friction between metals
b) Electrostatic discharge
c) Electric current flow
d) Potential difference between the train and the line
Answer: Potential difference between the train and the line
9.) the flow of electric current through a bulb in a torch or LED happens due to
a) Friction between wires
b) Heat produced due to friction
c) Electrostatic induction
d) Potential difference between the battery terminals
Answer: Potential difference between the battery terminals
11.) What is the potential difference between the two metal plates when two dry cells are connected
a) 1.)5 V
b) 3 V
c) 4.)5 V
d) 6 V
Answer: 3 V
12.) The magnitude of the current flowing through the earth due to constant electric current in the air id
a) Greater than 4000 times the current needed to light a bulb
b) Equal to the current needed to light a bulb
c) 4000 times smaller than the current needed to light a bulb
d) Equal to the current needed to charge a dry cell
Answer: Greater than 4000 times the current needed to light a bulb
13.) What does the magnitude of the current flowing through the earth depend on?
a) The magnitude of electric current in the air
b) The type of conductor used
c) The resistance of the ground
d) The length of the wire
Answer.)The magnitude of electric current in the air
14.) People in ancient India believed that lightning was caused due to
a) Friction between clouds
b) The wrath of gods and demons
c) Electromagnetic induction
d) Atmospheric pressure differences
Answer:The wrath of gods and demons
15.)The flash of light during a thunderstorm is followed by
a) Rainfall
b) Tornado formation
c) Thunderous sound
d) Hailstorm
Answer: Thunderous sound
16.) In which seasons do thunderstorms and lightning seldom occur in our country
a) Winter
b) Monsoon
c) Summer
d) Spring
Answer: Winter
17.) One of them is the effect of lighting on the world
a) Brightens the surroundings
b) Causes earthquakes
c) Shakes the world
d) Generates rainfall
Answer: Shakes the world
18.) Which scientific concept is related to the spark produced by removing a woollen sweater
a) Frictional electricity
b) Electrostatic induction
c) Electric current flow
d) Potential difference
Answer: Frictional electricity
19.) It is the term used to describe an atom with an equal number of protons and electrons
a) Positive ion
b) Negative ion
c) Neutral atom
d) Charged atom
Answer:Neutral atom
20.) The purpose of a pentograph on an electric train
a) To generate electricity
b) To store electricity
c) To transmit electricity
d) To control electricity
Answer: To transmit electricity
21.) the scientific reason behind the formation of negative ions when an electron is released from an atom is
a) Electrostatic discharge
b) Friction between metals
c) Electric current flow
d) Potential difference creation
Answer: Electrostatic discharge
22.) What should be the potential difference between the two metal plates when three dry cells are connected
a) 1.5 V
b) 3 V
c) 4.5 V
d) 6 V
Answer: 4.5 V
24.) one of the following places is safe during thunderstorm and lightning
A) Open verandah
b) Inside a house or building
c) Near tall trees
d) Open fields
Answer: Inside a house or building
25.) Identity the correct thing to do if you are caught in a forest during thunderstorm and lightning
a) Take shelter under tall trees
b) Take shelter under short trees
c) Stay in an open field
d) None of the above
Answer:Take shelter under short trees
26.) Precautionsthat should be taken inside the house during thunderstorm and lightning
A) Stay away from electrical wires and metal pipes
b) Unplug electrical appliances like television and refrigerator
c) Avoid using landline phones
d) All of the above
Answer: All of the above
27.) The purpose of a lightning conductor is
a) To attract lightning
b) To protect houses and electrical equipment from lightning
c) To generate electricity from lightning
d) To prevent thunderstorms
Answer: To protect houses and electrical equipment from lightning
28.) The definition of an epidemic is
a) A fatal disease outbreak
b) A disease affecting hundreds of people
c) The occurrence of a disease in a specific year
d) The occurrence of a disease in multiple individuals simultaneously
Answer: The occurrence of a disease in multiple individuals simultaneously
29.) The factors which should be considered to understand when a disease will turn into an epidemic
A) Symptoms and spread of the disease
b) Detection location and affected individuals
c) Timing and preventive measures
d) All of the above
Answer: All of the above
30.) How is an epidemic from infection transmitted?
a) Through contaminated water, air, or food
b) Directly from person to person or through carriers
c) By non-infectious factors
d) All of the above
Answer: Directly from person to person or through carriers
31.) An examples of a non-infectious epidemic is
A) Measles and Smallpox
b) Malaria and Influenza
c) Lung Cancer and Coronary Heart Disease
d) Tuberculosis and Typhoid
Answer: Lung Cancer and Coronary Heart Disease
32.) What is the cyclic pattern of some epidemic diseases?
a) Monthly intervals
b) Yearly intervals
c) Seasonal intervals
d) Random intervals
Answer: Yearly intervals
33.) It’s the disease caused by contaminated water and unhygienic environment
A) Cholera
b) Malaria
c) Dengue
d) Plague
Answer: Cholera
34.) Identify the name of the germ that causes cholera
a) Fibrio cholerae
b) Plasmodium var
c) Plasmodium falciparum
d) Yersinia pestis
Answer: Fibrio cholerae
35.) The transmission of malaria to a healthy person occurs
a) Through contaminated water
b) Through direct body contact
c) By a female Anopheles mosquito
d) By touching infected soil
Answer: By a female Anopheles mosquito
36.) The disease that is associated with high fevers, headaches, and joint pain is
A) Cholera
b) Malaria
c) Dengue
d) Plague
Answer: Malaria
37.) Choose the main symptom of dengue
a) Lung infection
b) Blood clotting
c) Low platelet count
d) Vomiting and coughing of blood
Answer: Low platelet count
38.) It’s the disease which has been successfully contained through the invention of a vaccine
A) Cholera
b) Smallpox
c) Kala azar
d) Diarrhoea
Answer: Smallpox
39.) Name the scientist who used cow-pox virus to create resistance against smallpox
A) Waldemar Haffkine
b) Edward Jenner
c) Charles Donovan
d) Upendranath Brahmacha
Answer: Edward Jenner
40.) The another name for kala azar
a) Red plague
b) Dumdum fever
c) Smallpox
d) Diarrhoea
Answer: Dumdum fever
41.)It is an effective remedy for diarrhoea
a) Oral Rehydration Solution (ORS)
b) Vaccination
c) Antibiotics
d) Bed rest
Answer:Oral Rehydration Solution (ORS)
42.) Which disease was first observed in Asia in 2003 and then spread to other continents?
a) Tuberculosis
b) Hepatitis
c) SARS
d) Influenza/Flu
Answer: SARS
43.) Identify the bacterium which is responsible for tuberculosis
a) Mycobacterium tuberculosis
b) Streptococcus pneumoniae
c) Escherichia coli
d) Salmonella typhi
Answer: Mycobacterium tuberculosis
44.) Tuberculosis is generally transmitted
a) Through contaminated food and water
b) Through physical contact
c) Through air
d) Through mosquito bites
Answer: through air
45.) The organ that is affected by hepatitis is
a) Lungs
b) Liver
c) Intestines
d) Bones
Answer: Liver
46.) Which types of hepatitis are transmitted through contaminated food and water?
A) Hepatitis A and E
b) Hepatitis B and C
c) Hepatitis C and D
d) Hepatitis D and E
Answer: Hepatitis A and E
47.) Influenza / flu have a common symptom which is
a) Severe cough with blood
b) Jaundice
c) Joint pain
d) Diarrhoea
Answer:Joint pain
48.) Name the virus responsible for causing AIDS.
a) HIV
b) H1N1
c) HSV
d) HPV
Answer: HIV
49.) The primary focus of awareness programs to combat AIDS are
a) Promoting safe sex practices
b) Encouraging vaccination
c) Educating about proper nutrition
d) Emphasizing physical exercise
Answer: Promoting safe sex practices
50.) Except one all others are of problems associated with improper food habits and lifestyle
A) Intake of excess lipid
b) Intake of excess carbohydrate
c) Staying awake at night and insufficient sleep
d) Working with computer for long duration without interruption
Answer: Working with computer for long duration without interruption
Q.(2) Short answer questions
(1) What happens when people intake excess of lipid ?
→ It causes fat deposits in the artery walls leads to risk of heart diseases.
(2) What happens when people intake excess of carbohydrates ?
→ When body always in high blood sugar levels due to excess of carbohydrates intake it causes weight gain poor metabolic health and risk of heart diseases .
(3) What happens to a person with the insufficient sleep and staying awake at night for a longer period of time ?
→It causes physiological disorder called as fatigue. It can harm your mental health, your mood swings and emotions.
(4) Write the causes of excessive use of mobile phone ?
→It causes anxiety and depression.
(5) Write the full form of AIDS ?
→Acquired Immune Deficiency Syndrome
(6) Name the virus responsible for AIDS ?
→It is HIV Human Immunodeficiency Virus.
(7) What is influenza ?
→ It is fearful viral disease affecting respiratory system. It spread through physical contact, coughing and sneezing.
(8) How AIDS gets spread ?
→Through blood , body fluid and mucous.
(9) What is hepatitis ?
→ Hepatitis is lethal viral disease which affects liver. It’s has 5 types.
(10) Name the disease caused by bacteria ?
→Tuberculosis caused by the bacteria Mycobacterium tuberculosis.
(11) What are the causes of diarrhea ?
→ Body gets dehydrated. The hydrostatic balance of the body and the acid-alkali equilibrium of the body gets disturbed.
(12) How diarrhea spreads ?
→ Diarrhea spread from drinking of contaminated water and unsafe food.
(13) What is another name of smallpox ?
→ Red plague.
(14) What is small pox ?
→Smallpox is the deadly virus infection occurs in the veins and venules of the skin, the mouth and in the throat.
(15) Write the name of type of dengue causing mosquito ?
→Type of mosquito called Aedes Egypt carrying the germ of the dengue.
(16) Write example of epidemic from common source ?
→ E.g. Bhopal gas tragedy
Japan’s Minamata disease
(17) Write example of non-infectious disease ?
→
- Lung cancer
- Coronary heart disease
(18) Write examples of epidemic from infection ?
→
- Smallpox
- Dengue malaria
- Influenza
(19) What is the name of the germ causing cholera ?
→ Vibrio cholerae.
(20) What are the causes of disease Cholera ?
→ Polluted water, uncovered and fly infected food causes cholera.
(21) Write the name of the germ causing malaria ?
→Plasmodium vivax
(22) When the world malaria day celebrated ?
→ 25th day of April celebrated as world malaria day.
(23) What are the symptoms of malaria ?
→
- High fever with tremors.
- Fever with sweating
- Enlargement of the liver and spleen.
(24) How plague is transmitted ?
→ Plague is a transmitted by the rats to the human body.
(25) Which bacteria is responsible for plague ?
→ Yersinia pestis if the bacterium responsible for plague.
(26) What are the symptoms of plague ?
→
- Oozing of blood with cough
- Sneezing
- Swelling of the lymph gland
- Vomiting
(27) Who invented the vaccine for plague ?
→ Waldemar huffkin invented the vaccine in 1987 for plague .
(28) Where the existence of SARS has been detected first ?
→ The existence of SARS has been detected first in Asia and then spread to North and South America and Europe.
(29) When the World hepatitis day celebrated ?
→ 28th of July celebrated as World hepatitis day.
(30) What are the symptoms of hepatitis ?
→
- Jaundice
- Vomiting
- Stomach pain
Also See: Previous Chapter Structure of Living Organism Question Answer