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Here are 20 Multiple Choice Questions (MCQs) with answers (Serial No. 141 to 160) based on the AP DDSC Secondary Grade Teacher SGT 2025 syllabus topic: “Our Environment” – as per Class III to VIII content (difficulty up to Class X):

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AP DSC SGT Science MCQs: Our Environment (Q. No. 141–160)

141. What is the main component of air by volume?
A) Oxygen
B) Carbon dioxide
C) Nitrogen
D) Hydrogen
Answer: C) Nitrogen

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142. Which gas is responsible for the greenhouse effect?
A) Oxygen
B) Carbon dioxide
C) Nitrogen
D) Helium
Answer: B) Carbon dioxide

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143. Which natural phenomenon is caused by low pressure and strong wind systems over oceans?
A) Drought
B) Earthquake
C) Cyclone
D) Volcano
Answer: C) Cyclone

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144. What is the process of converting wastewater into usable water called?
A) Desalination
B) Purification
C) Water harvesting
D) Sewage treatment
Answer: D) Sewage treatment

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145. Which of the following is an eco-friendly practice?
A) Using plastic bags
B) Burning garbage
C) Reusing cloth bags
D) Throwing waste in rivers
Answer: C) Reusing cloth bags

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146. What causes acid rain?
A) Excess oxygen in air
B) Nitrogen oxide and sulfur dioxide
C) Carbon monoxide
D) Methane
Answer: B) Nitrogen oxide and sulfur dioxide

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147. Which property of air helps in drying clothes?
A) Color
B) Humidity
C) Transparency
D) Motion
Answer: D) Motion

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148. Which process helps in adding oxygen back into the atmosphere?
A) Respiration
B) Combustion
C) Photosynthesis
D) Fermentation
Answer: C) Photosynthesis

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149. The Chipko Movement is associated with:
A) Water conservation
B) Saving forests
C) Pollution control
D) Wildlife protection
Answer: B) Saving forests

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150. Which is a major cause of air pollution in cities?
A) Crop harvesting
B) Wind blowing
C) Vehicle emissions
D) Sea breeze
Answer: C) Vehicle emissions

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151. Which of the following is an example of weather and not climate?
A) The Sahara is dry
B) It rained yesterday
C) Kerala has heavy monsoons
D) Ladakh is cold
Answer: B) It rained yesterday

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152. Which of the following is not a waterborne disease?
A) Cholera
B) Typhoid
C) Tuberculosis
D) Dysentery
Answer: C) Tuberculosis

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153. What is the full cycle of water movement in nature called?
A) Nitrogen cycle
B) Water cycle
C) Hydrological table
D) Condensation
Answer: B) Water cycle

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154. Which river is a major water source in Andhra Pradesh?
A) Yamuna
B) Ganga
C) Krishna
D) Godavari
Answer: D) Godavari

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155. What is the effect of deforestation?
A) Increased rainfall
B) Increase in biodiversity
C) Soil erosion and habitat loss
D) Cleaner air
Answer: C) Soil erosion and habitat loss

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156. Which form of water is found in glaciers?
A) Liquid
B) Solid
C) Vapour
D) Steam
Answer: B) Solid

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157. Which activity is NOT suitable for water conservation?
A) Fixing leaking taps
B) Rainwater harvesting
C) Open defecation
D) Reusing RO wastewater
Answer: C) Open defecation

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158. Which of the following is a sign of climate change?
A) One-day rainfall
B) Frequent floods and droughts
C) Morning dew
D) Change in wind direction
Answer: B) Frequent floods and droughts

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159. Which of these is an endangered species in India?
A) Cow
B) Tiger
C) Dog
D) Goat
Answer: B) Tiger

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160. Which helps in maintaining biodiversity in forests?
A) Deforestation
B) Forest fires
C) Conservation and protected areas
D) Grazing
Answer: C) Conservation and protected areas

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