ADI Vehicle Safety & Mechanics

Question 1

What is the minimum legal tread depth for car tyres in the UK?

Accepted Answer

1.6 mm across the central 75% of the width around the full circumference

Answer

1 mm across the central 75% of the tyre

Answer

2 mm across the full tyre

Answer

3 mm for front tyres, 1.6 mm for rear tyres

Question 2

What does the engine management warning light (amber) indicate?

Accepted Answer

A fault has been detected in the engine management system that requires investigation

Answer

Immediate engine failure — stop now

Answer

The engine oil is low

Answer

The car requires a service

Question 3

How often should tyre pressures be checked?

Accepted Answer

At least monthly and before any long journey

Answer

Once a year at the annual service

Answer

Only when a tyre appears visually flat

Answer

Every 10,000 miles

Question 4

Anti-lock braking system (ABS) is designed to:

Accepted Answer

Prevent wheel lock-up under heavy braking, maintaining steering control

Answer

Stop the car in a shorter distance than manual braking

Answer

Replace the need for pumping the brakes

Answer

Only assist on ice

Question 5

Which fluid level should be checked as part of routine vehicle safety before a long journey?

Accepted Answer

Engine oil, coolant, brake fluid, power steering fluid and screenwash

Answer

Engine oil level only

Answer

Engine oil and fuel only

Answer

Only fluids that have a warning light

Question 6

Electronic stability control (ESC) helps prevent:

Accepted Answer

Skidding and loss of control by automatically applying brakes to individual wheels

Answer

Aquaplaning on wet roads

Answer

Tyre blow-outs at high speed

Answer

Engine overheating