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18 solved questions on Environmental Science
CSS 2026General Science & AbilityQ. 2
(a) Evaluate the impact of excessive fertilizer use on soil chemistry and groundwater quality. (b) Describe the structural organization of the solar system, including terrestrial planets, gas giants, dwarf planets. (c) Discuss the environmental and chemical challenges associated with polymer degradation. Evaluate the effectiveness of biodegradable plastics in addressing global plastic pollution. (d) Identify the major causes of food deterioration (biological, chemical, physical) and give examples for each.
#cssnexus #Excessive Fertilizer Use #Soil Chemistry #Groundwater Nitrate
CSS Nexus6 Nov 2026
CSS 2026General Science & AbilityQ. 3
(a) Explain the key phases of Disaster Risk Management: mitigation, preparedness, response, and recovery. (b) Describe the physical factors that trigger Avalanches in mountainous regions. Name the modern technologies used in avalanche prediction and monitoring. (c) Discuss the structural diversity of lipids. Evaluate how variations in fatty acid composition influence membrane fluidity and cell signalling mechanisms. (d) Describe the process of solar photovoltaic energy conversion. How do factors such as irradiance, panel orientation, and temperature influence solar power output?
#cssnexus #Disaster Risk Management #Disaster Management Phases #Avalanche Triggers
CSS Nexus6 Nov 2026
CSS 2025General Science & AbilityQ. 2
(a) What effects are produced due to Rotation & Revolution of Earth? Explain briefly. (b) Describe Electromagnetic Radiations. Give its types and explain their applications. (c) What are Hurricanes? How they are formed and what level of damage they can produce? (d) Explain the advantages and disadvantages of nitrogen containing fertilizers and insecticides.
#cssnexus #Rotation of Earth #Revolution of Earth #Electromagnetic Spectrum
CSS Nexus6 Nov 2026
CSS 2025General Science & AbilityQ. 4
(a) What is deforestation? State the disadvantages caused to the environment due to this. (b) Explain how water pollution is produced? Describe the part played by bacteria after a river has been polluted by sewage. (c) State some examples of pollution caused by human activity and discuss the effects of each example. (d) What does air pollution mean? State ten serious effects of air pollution on the environment and briefly explain how they can be reduced?
#cssnexus #Deforestation #Effects of Deforestation #Water Pollution
CSS Nexus6 Nov 2026
CSS 2024General Science & AbilityQ. 3
(a) What is difference between Plastics and Elastics? Explain briefly. (b) What is role of Remote sensing and GIS in environmental Science? Discuss briefly. (c) What are Kepler laws related to the motion of planets? (d) What is difference between preservatives and antioxidants? Discuss briefly with examples.
#cssnexus #Plastics and Elastomers #Remote Sensing #GIS
CSS Nexus6 Nov 2026
CSS 2024General Science & AbilityQ. 4
(a) What is role of Carbohydrates and Vitamins in the body? Discuss briefly. (b) Discuss the functioning of Liver and Pancreas. (c) What are the standards of drinking water? How Heavy Metals in the water affect the living organisms? (d) What is radioactivity? Discuss the laws of radioactivity. Name two radioactive elements.
#cssnexus #Role of Carbohydrates #Role of Vitamins #Liver Functions
CSS Nexus6 Nov 2026
CSS 2023General Science & AbilityQ. 2
(a) Define ceramic and nano-ceramic materials. Why the nano-ceramics show better properties than their ceramic counterparts? Write the applications of ceramic materials. (b) What is 'Black Hole'? How black holes are formed and discovered? (c) Write two applications of each of the following electromagnetic radiations: (i) Ultraviolet (ii) Infra-red (iii) Microwaves (iv) Radio waves (v) X-rays. (d) What is Wildfire? Explain its types, causes, spread and preventions.
#cssnexus #Ceramics #Nano Ceramics #Black Hole
CSS Nexus6 Nov 2026
CSS 2023General Science & AbilityQ. 4
(a) What is the difference between fog and smog? What are the causes of smog and its effects on human health? Write short note on any one of the latest technologies to eliminate smog to avoid atmospheric pollution. (b) What is the role of oxygen-demanding wastes in water pollution? How it can be prevented? (c) What is the biosphere? Write a note on the 'Energy Resources' available in the biosphere. (d) What are the different layers of the atmosphere? On what basis these layers are classified? In which layer 'Auroras' are formed and where do satellites orbit?
#cssnexus #Fog and Smog #Causes of Smog #Smog Tower
CSS Nexus6 Nov 2026
CSS Special 2023General Science & AbilityQ. 3
(A) What is a 'Weather Cycle'? Describe its causes and parts. (B) What is 'Air Pollution'? Discuss its causes and measurement methods. Name the countries with the highest and lowest percentage of it. (C) Write a comprehensive note on 'Pole Reversal of Earth'. (D) Describe different Ocean Currents, their causes and their effects on Climate.
#cssnexus #Weather Cycle #Air Pollution #Air Quality Index
CSS Nexus6 Nov 2026
CSS 2022General Science & AbilityQ. 2
(a) What do you know about Volcanoes? Discuss the causes and effects of volcanic eruptions. (b) Differentiate between renewable and non-renewable sources of energy. Briefly explain wind energy, solar energy and biofuels. (c) What is a Tornado? How is it formed and what are the effects of tornadoes? Explain briefly. (d) Discuss various factors which affect the variations in the climate of a place.
#cssnexus #Volcanoes #Causes of Volcanic Eruptions #Renewable Energy
CSS Nexus6 Nov 2026
CSS 2022General Science & AbilityQ. 3
(a) Discuss Vaccination, types of Vaccines, their side-effects and effectiveness. (b) What is Polio? Discuss its symptoms, causes of spreading, prevention and vaccine. (c) What do you understand by the DNA and RNA? (d) What is Solid Waste? Discuss the main issues of Solid Waste Management in our country?
#cssnexus #Vaccination #Types of Vaccines #Vaccine Side Effects
CSS Nexus6 Nov 2026
CSS 2022General Science & AbilityQ. 4
(a) Define the term Water Pollution. What indicators are used to measure the quality of water? Write down the drinking water quality standards. (b) What do you understand by the term Population Planning? Point out the different benefits of Population Planning. (c) Discuss the possible negative effects that Pakistan may face due to Global Warming and Climate Change. What steps may be helpful to control the climatic change? (d) What is Radioactivity? Differentiate between natural and artificial radioactivity.
#cssnexus #Water Pollution #Water Quality Indicators #Drinking Water Standards
CSS Nexus6 Nov 2026
CSS 2021General Science & AbilityQ. 4
(a) What is the sequence of strata of atmosphere and on what factors does it depends? (b) Describe water cycle and briefly explain the major processes involved in water cycle? (c) What is the Difference between asthenosphere and lithosphere? Explain various components of lithosphere. (d) Differentiate between food contaminants and food adulterants.
#cssnexus #Layers of Atmosphere #Water Cycle #Evaporation and Condensation
CSS Nexus6 Nov 2026
CSS 2020General Science & AbilityQ. 4
(a) Briefly describe the various segments of atmosphere. How these segments are maintaining the Earth Radiation Balance? (b) How the organic particulate matter enters in the atmosphere. Also describe the sources? (c) What is natural radioactivity? How it is different from the artificial radioactivity? (d) What are the Fossils? Discuss the importance of paleontology.
#cssnexus #Layers of Atmosphere #Earth Radiation Balance #Organic Particulate Matter
CSS Nexus6 Nov 2026
CSS 2019General Science & AbilityQ. 2
(a) Deficiency of vitamins causes different human diseases. Choose the correct type of vitamin (Vit. A, Vit. B1, Vit. C, Vit. D, Vit. E, Vit. K) for each disease: 1. Poor night vision 2. Bleeding gums 3. Rickets in children 4. Beri-Beri 5. Anaemia. (b) People suffering from cardiovascular disease having high level of cholesterol in their blood, this often leads to build of fats on its internal arterial walls, suggest how this might be harmful to the heart. (c) Why the excessive use of chemical fertilizers should be avoided? (d) Why are Scientists worried about the increase of CO2 in atmosphere?
#cssnexus #Vitamin Deficiency Diseases #Cholesterol #Atherosclerosis
CSS Nexus6 Nov 2026
CSS 2018General Science & AbilityQ. 4
(A) What is 'Acid Rain'. Describe its causes and how it can be prevented? (B) What is 'Water Pollution'. Discuss its causes and measurement methods. Name the countries with the highest and lowest percentage of it. (C) Write a comprehensive note on 'Smog'. (D) Describe different causes of 'Tsunami'. Is there any difference between a Tsunami and a tidal wave? Name the worst Tsunami ever recorded.
#cssnexus #Acid Rain #Prevention of Acid Rain #Water Pollution
CSS Nexus6 Nov 2026
CSS 2017General Science & AbilityQ. 2
(A) What are the factors responsible for environmental pollution? (B) Briefly explain the main reasons of water-logging in Pakistan. (C) What do you mean by Ozone depletion and how we can prevent its depletion? (D) What is an Acid Rain and how it is produced. Briefly describe the dangers associated with it?
#cssnexus #Environmental Pollution #Causes of Pollution #Waterlogging in Pakistan
CSS Nexus6 Nov 2026
CSS 2016General Science & AbilityQ. 2
(a) What were the main objectives of Clean Development Mechanism? Also explain the reasons for the criticism on Kyoto Protocol by the developed countries. (b) Differentiate between Sanitary and Industrial Landfills, also describe the land selection criteria for Landfills.
#cssnexus #Clean Development Mechanism #Kyoto Protocol #Climate Change
CSS Nexus6 Nov 2026