1 Clean water is essential mainly for: A Industries only B Agriculture only C Human health and environment D Animals only
2 David is studying the treatment of domestic water. He knows that raw water treatment involves several steps. What is the first step in the treatment of raw water? A Filtration B Chlorination C Sedimentation D Coagulation
3 Xia is learning about the treatment of domestic water. She knows that sedimentation allows particles to settle. What is the purpose of sedimentation? A To kill bacteria B To remove heavy particles by settling C To dissolve gases D To add minerals
4 Uma is studying water treatment. She knows that coagulation involves the addition of chemicals. What is the purpose of adding alum in coagulation? A To add minerals B To neutralize acids C To make suspended particles clump together D To kill bacteria
5 Khalid is learning about carbon monoxide detectors. He understands that CO detectors save lives. Where should a carbon monoxide detector be placed in a home? A In the garage B Near sleeping areas C In the kitchen D Outside the house
6 Bilal is analyzing the quality of water from a river. He finds that the water contains a high amount of dissolved oxygen. Why is dissolved oxygen important for water quality? A It causes corrosion of pipes B It supports aquatic life like fish and other organisms C It increases the pH of water D It makes water taste salty
7 Xia is studying the effects of climate change. She understands that climate change affects food production. How does climate change affect agriculture? A By increasing crop yields B By causing droughts and changing growing seasons C By improving soil quality D By reducing pests
8 Yusuf is studying water pollution. He knows that phosphates from detergents can cause problems. What is a major issue caused by phosphates in water? A They kill all fish B They promote algal blooms that deplete oxygen C They make water acidic D They increase water clarity
9 Fatima is learning about catalytic converters. She understands that catalytic converters are effective in reducing vehicle emissions. Which gases are reduced by a catalytic converter? A CO and NOx B CO2 and O2 C Methane and ozone D SO2 and CO2
12 Nora is studying water pollution. She knows that household wastes can pollute water. Which of the following is a household waste that can pollute water? A Compost B Detergents and cleaning agents C Rainwater D Groundwater
14 Usman is studying acid rain mitigation. He learns that adding limestone to lakes can neutralize acidity. What is the purpose of adding limestone to acidified lakes? A To increase acidity B To neutralize acid and raise pH C To add nutrients D To kill algae
15 Sam is studying inadequate water supply in Pakistan. He knows that many areas face water shortages. What is a consequence of inadequate water supply? A Increased agricultural productivity B Health problems and reduced sanitation C Lower demand for water D Increased rainfall
16 Which international agreement aims to protect the ozone layer? A Kyoto Protocol B Montreal Protocol C Paris Agreement D Geneva Convention
17 Qasim is learning about strategies to reduce acid rain. He understands that reducing SO2 emissions is key. How can SO2 emissions be reduced? A Using higher sulfur coal B Using flue gas desulfurization (scrubbers) C Burning more coal D Reducing the use of renewable energy
18 Which of the following causes depletion of ozone layer? A Carbon dioxide B Methane C Chlorofluorocarbons D Oxygen
19 Bilal is learning about air pollutants. His teacher explains that pollutants can be natural or man-made. Which of the following is a primary air pollutant released from the burning of fossil fuels? A Ozone B Sulfur dioxide C Water vapor D Nitrogen gas
20 Which activity increases water pollution? A Water treatment B Industrial waste discharge C Recycling D Rainfall
21 Hina is studying wastewater. She knows that wastewater contains harmful microbes. What is a major concern with harmful microbes in water? A They increase the pH of water B They cause waterborne diseases C They make water taste sweet D They help in water purification
22 Diana is learning about climate change. She understands that climate change leads to rising sea levels. What is a consequence of rising sea levels? A Increased agricultural land B Flooding of coastal areas C Desertification D Improved air quality
23 Carbon monoxide is mainly produced by: A Photosynthesis B Incomplete combustion of fuels C Volcanoes D Respiration
24 Which famous monument is damaged by acid rain? A Great Wall B Eiffel Tower C Taj Mahal D Statue of Liberty
25 Julia is studying waterborne diseases. She knows that dysentery is a waterborne disease. What is a symptom of dysentery? A Skin rash B Severe diarrhea with blood C Cough D Headache