Practice: Pollution, and Global Environmental Issues

A) Burning of candles in homes
B) Smoke from vehicles using petrol and diesel
C) Growth of trees along roads
D) Evaporation of water from ponds

A) Increase in plant growth
B) Stronger bones
C) Respiratory problems like asthma
D) Faster digestion of food

A) Burning dry leaves in the playground
B) Encouraging students to use bicycles
C) Using diesel generators unnecessarily
D) Keeping vehicle engines idling for long time at the gate

A) Mixing of smoke and fog
B) Only dust storms
C) Only sea breeze
D) Only water vapour from lakes

A) It affects only plants, not humans
B) It can damage buildings and monuments
C) It is useful for increasing oxygen level
D) It never spreads from one area to another

A) Only rainwater
B) Untreated sewage released into the river
C) Wind blowing over the river
D) Mixing of cold and warm water naturally

A) Only rainwater
B) Water with soap, food waste and excreta from houses
C) Clean water from a hand pump
D) Only water from a lake used for irrigation

A) Sand and gravel only
B) Microorganisms to break down organic matter
C) Strong acids to dissolve all solids
D) Only heating of water to high temperature

A) Increase in dissolved oxygen
B) Decrease in dissolved oxygen leading to fish death
C) Formation of more drinking water
D) Only increase in speed of river flow always

A) Throwing medicines into the drain
B) Pouring used oil into the sink
C) Avoiding plastic and solid waste in drains
D) Washing paint brushes directly in open drains always

A) Sunburn
B) Mosquito-borne diseases
C) Fracture of bones
D) Tooth decay only

A) Keeping dustbins open
B) Leaving food uncovered
C) Segregating dry and wet waste
D) Throwing garbage on the roadside daily

A) Deficiency diseases
B) Water-borne diseases like cholera
C) Genetic disorders
D) Only eye colour changes in children

A) Eating without washing hands
B) Washing hands with soap before meals
C) Drinking any water without filtration
D) Using open fields as toilets regularly

A) Good sanitation increases spread of germs
B) Sanitation has no effect on health
C) Good sanitation reduces the spread of many infectious diseases
D) Diseases spread only through air, not through water or waste at all

A) Open drains on roadsides
B) Septic tank connected to toilets
C) Throwing sewage into fields
D) Letting sewage flow on street surface always

A) High-rise city apartments
B) Remote villages without sewer system
C) Big railway stations
D) Only large shopping malls in cities

A) Burnt using gas
B) Removed daily by hand
C) Allowed to settle and decompose by bacteria
D) Converted instantly into drinking water without treatment at all

A) Use large quantity of water
B) Do not need any maintenance
C) Use little water and reduce contamination of water bodies
D) Release sewage directly into rivers everywhere always

A) Open defecation is safer than pit latrines
B) Septic tanks and twin pits help prevent pollution of nearby ponds
C) All sewage must be thrown directly into the nearest river
D) Alternative systems are needed only in big cities, not in villages at all

A) Oxygen
B) Hydrogen
C) Carbon dioxide
D) Helium

A) Always harmful to life
B) Necessary to keep Earth’s temperature suitable for life
C) Responsible for earthquakes
D) The same as acid rain formation only

A) Increase in temperature of one city
B) Gradual rise in average temperature of Earth’s atmosphere
C) Sudden temperature change in one season
D) Only heating of water in oceans by geysers directly

A) Burning more coal for electricity
B) Cutting forests for fuelwood
C) Using solar and wind energy
D) Leaving lights and fans on unnecessarily everywhere always

A) Melting of ice caps and rise in sea level
B) Decrease in temperature everywhere suddenly
C) Formation of rocks from magma
D) Only change in colour of rivers but not in temperature or weather at all

A) Radio waves
B) Ultraviolet rays from the Sun
C) Visible light
D) Sound waves from thunderstorms only

A) Excess oxygen
B) Use of chlorofluorocarbons (CFCs)
C) More nitrogen in air
D) Only natural rainfall distribution changes always

A) Oxygen and nitrogen only
B) Sulphur dioxide and nitrogen oxides
C) Hydrogen and helium
D) Only pure oxygen in the atmosphere all the time

A) Concrete dam only
B) Marble monument
C) Wooden stick
D) Plastic bucket at home always in all seasons and places equally

A) Using more coal for power generation
B) Installing pollution control devices in industries
C) Increasing number of diesel vehicles
D) Burning waste in open spaces everywhere regularly

A) Oceans
B) Rocks
C) Atmosphere
D) Human body only in all cases and places

A) Releasing oxygen into soil
B) Converting atmospheric nitrogen into usable compounds
C) Removing all minerals from soil
D) Only increasing soil temperature during summer always

A) Nitrogen gas (N₂)
B) Nitrates and ammonium ions
C) Carbon dioxide
D) Only oxygen dissolved in water always

A) Fixing nitrogen directly from air
B) Breaking down dead bodies and returning nitrogen compounds to soil
C) Converting nitrates back into N₂ gas only
D) Stopping all nutrient movement in soil everywhere completely

A) Converting N₂ into nitrates
B) Converting nitrates back into N₂ gas
C) Making proteins directly in plants
D) Only forming oxygen gas from nitrates everywhere always