DGT Environmental Awareness & Conservation 3

Question 1

Which of the following road surfaces reflects the most solar heat, contributing to the urban heat island effect?

Accepted Answer

Dark asphalt pavement

Answer

Dark asphalt absorbs up to 95% of solar radiation and re-radiates it as heat, intensifying the urban heat island effect.

Question 2

What is the primary reason tire pressure directly affects vehicle fuel efficiency and environmental impact?

Accepted Answer

Under-inflated tires increase rolling resistance, forcing the engine to burn more fuel

Answer

Under-inflated tires flex more with each rotation, increasing rolling resistance and requiring more fuel energy to maintain speed.

Question 3

A vehicle's air conditioning system can reduce fuel efficiency by up to what approximate percentage on a hot day?

Accepted Answer

25%

Answer

Running air conditioning can reduce fuel economy by up to 25% in city driving by placing an additional load on the engine.

Question 4

When idling a vehicle engine for more than how many minutes is it typically more fuel-efficient to turn it off?

Accepted Answer

30 seconds to 1 minute

Answer

Modern engines consume less fuel restarting than idling for more than about 30–60 seconds, making shutoff the greener choice.

Question 5

What environmental hazard is most associated with older vehicles using leaded gasoline in countries where it was not yet phased out?

Accepted Answer

Lead poisoning of soil and groundwater near roadways

Answer

Lead particles from leaded exhaust settle onto soil and wash into groundwater, causing toxic contamination in ecosystems and human populations.

(DGT) Directorate-General for Traffic Test Practice Test