Question

Catalytic converters convert

• A. biomass into energy
• B. harmful emissions into harmless gases
• C. solar energy into electricity
• D. plants into biofuel

Answer 1

The correct option is B

harmful emissions into harmless gases

The explanation for the correct option

Option B: Harmful emissions into harmless gases

1. The oxides of nitrogen released by the exhausts of engines of vehicles are poisonous gases.
2. It can cause lung congestion.
3. Vehicles are now fitted with catalytic converters which convert these eases to harmless gases.

The explanation for the incorrect options

Option A: Biomass into energy

1. Direct combustion is the common method for converting biomass to useful energy.
2. All biomass can be burned directly for heating buildings and water, for industrial process heat, and for generating electricity in steam turbines

Option C: Solar energy into electricity

1. A solar cell converts solar energy into electricity. The sun's rays are made incident on thin layers of a substance like silicon or gallium, which produces electricity.
2. To obtain more electricity, a number of solar cells are joined together to form a solar cell panel.
3. These panels are used in artificial satellites, water pumps, street lighting, etc.

Option D: Plants into biofuel

1. There are various ways of making biofuels, but they generally use chemical reactions, fermentation, and heat to break down the starches, sugars, and other molecules in plants.
2. The resulting products are then refined to produce fuel that cars or other vehicles can use.

Thus, catalytic converters convert harmful emissions into harmless gases.

Hence, option (B) is correct.