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Which of the following is not a combustible substance?

• Kerosene

• Wood

• Iron nails

• Paper

Which of the following fuels has the least calorific value?

• Kerosene

• CNG

• Coal

• LPG

Which of the following gases is the main cause of global warming?

• Nitrogen dioxide

• Sulphur dioxide

• Carbon dioxide

• Carbon monoxide

Which zone of a candle flame is the hottest?

• Luminous zone

• Non-luminous zone

• Dark zone

• Blue zone

Which of the following is an environment friendly fuel which is used in automobiles?

• Petrol

• Diesel

• Natural Gas

• Petroleum Gas

Balance the equation: C₆H₁₄ + O₂ --> CO₂ + H₂O

• 2C₆H₁₄ + 9O₂ --> 12CO₂ + 10H₂O

• 2C₆H₁₄ + 19O₂ --> 12CO₂ + 14H₂O

• 4C₆H₁₄ + 38O₂ --> 24CO₂ + 28H₂O

• 2C₆H₁₄ + 6O₂ --> 8CO₂ + 5H₂O

What is the chemical formula for water?

• H₂O

• CO₂

• O₂

• H₂O₂

What is the primary greenhouse gas emitted by human activities?

• Methane

• Carbon dioxide

• Nitrous oxide

• Ozone

Which of the following is a non-renewable resource?

• Solar energy

• Wind energy

• Natural gas

• Hydropower