81. Refractory materials resist:
A) Cold
B) Heat
C) Pressure
D) Light
Answer: B
82. Which is a biofuel?
A) Diesel
B) Petrol
C) Ethanol
D) Kerosene
Answer: C
83. Biodiesel is produced from:
A) Coal
B) Vegetable oils
C) Natural gas
D) Minerals
Answer: B
84. Industrial wastewater contains:
A) Pollutants
B) Pure water
C) Only salts
D) Only gases
Answer: A
85. Effluent treatment plants are used to:
A) Increase pollution
B) Remove pollutants
C) Produce chemicals
D) Store waste
Answer: B
86. Air pollution from industries mainly includes:
A) CO₂
B) SO₂
C) NOₓ
D) All of these
Answer: D
87.Catalytic converters reduce:
A) Noise
B) Air pollution
C) Water pollution
D) Heat
Answer: B
88. Ozone layer depletion is caused by:
A) CO₂
B) CFCs
C) SO₂
D) CH₄
Answer: B
89. Greenhouse gases include:
A) CO₂
B) CH₄
C) N₂O
D) All of these
Answer: D
90. Which process reduces industrial waste?
A) Recycling
B) Incineration
C) Landfilling
D) All of these
Answer: D