Below is a free Alertness mock test for the UK DVSA car theory test: multiple-choice questions in the official four-option format, each with the correct answer, a plain-English explanation and a Highway Code reference. Observation, anticipation, concentration, distraction and fatigue at the wheel.
Alertness practice questions
Q1. You're driving on a motorway and begin to feel drowsy. What should you do?
- Open a window and continue to your destination
- Stop on the hard shoulder for a short rest
- Leave at the next exit or services and take a break
- Increase your speed to finish the journey sooner
Answer: C. You must not stop on the hard shoulder to rest. Leave the motorway at the next exit or services, then stop somewhere safe and rest. On long journeys, plan a break of at least 15 minutes every two hours. Reference: The Highway Code, rule 91
Q2. Why should you check your mirrors before signalling?
- To make sure your signals are working
- So you know how your manoeuvre will affect traffic behind you
- Because it is only required on motorways
- To see whether the road ahead is clear
Answer: B. The Mirrors–Signal–Manoeuvre routine starts with mirrors so you understand the position and speed of traffic behind before you commit to signalling or changing course. Reference: The Highway Code, rule 161
Q3. Before moving off from the side of the road, what should you do just before pulling away?
- Sound your horn to warn other road users
- Look round to check your blind spot
- Switch on your hazard warning lights
- Select a higher gear
Answer: B. Mirrors don't cover everything. A final look over your shoulder into the blind spot catches cyclists, motorcyclists and pedestrians your mirrors miss before you move off. Reference: The Highway Code, rule 159
Q4. Using a hands-free phone while driving is likely to do what?
- Improve your reaction times
- Distract your attention from the road
- Be illegal in all circumstances
- Have no effect on your driving
Answer: B. Even hands-free calls divide your attention and slow your reactions. It's far safer to let calls go to voicemail and return them when you're safely parked. Reference: The Highway Code, rule 149
Q5. What effect can tinted glasses or a dirty windscreen have when driving at night?
- They reduce glare and improve your view
- They restrict your view and make hazards harder to see
- They have no effect if your headlights are on
- They only matter in fog
Answer: B. At night your eyes need every bit of available light. Tinted lenses and dirt or condensation on the windscreen cut the light reaching your eyes and hide developing hazards. Reference: The Highway Code, rule 94
Q6. When may you use a hand-held mobile phone while driving?
- When stopped in a traffic queue
- When waiting at traffic lights
- Only to call 999 or 112 in a genuine emergency when it's unsafe or impractical to stop
- When driving below 20 mph
Answer: C. Hand-held phone use is illegal whenever you're driving — including queues and red lights, where you're still 'driving' in law. The only exception is a genuine emergency call when stopping isn't safe or practical. Reference: The Highway Code, rule 149
Q7. You need to change the destination in your sat-nav. What should you do?
- Update it while driving slowly
- Stop somewhere safe and legal before reprogramming it
- Ask a rear passenger to lean over and do it
- Update it at the next red light
Answer: B. Programming a sat-nav demands eyes and attention that belong on the road. Stop somewhere safe first — and position the unit where it doesn't block your view of the road. Reference: The Highway Code, rule 150
Q8. Why should you glance over your shoulder before changing lanes on a dual carriageway?
- To check your rear seat belt is fastened
- Mirrors leave blind spots where a whole vehicle can hide
- It's only required when towing
- To make eye contact with the driver behind
Answer: B. Even correctly adjusted mirrors have blind spots large enough to hide a car or motorcycle alongside you. A quick sideways glance before committing to a lane change closes that gap. Reference: The Highway Code, rules 159 and 161
Frequently asked questions
How many Alertness questions are in the real theory test?
The DVSA doesn't publish per-topic counts. Your 50 questions are drawn across all 14 official topics, so revise every category.
What is the pass mark for the UK theory test?
You need 43 out of 50 multiple-choice questions correct (86%), plus 44 out of 75 on the hazard perception clips. You must pass both parts in the same sitting.
Are these real DVSA questions?
No — these are original practice questions written to the current DVSA syllabus and The Highway Code. Official revision questions are Crown Copyright and only available from licensed providers.
Revise the other theory test topics
Your 50 test questions are drawn from all 14 official DVSA topics — revise every category, not just this one.
- Attitude
- Essential Documents
- Hazard Awareness
- Incidents, Accidents & Emergencies
- Motorway Rules
- Other Types of Vehicle
- Road & Traffic Signs
- Rules of the Road
- Safety & Your Vehicle
- Safety Margins
- Vehicle Handling
- Vehicle Loading
- Vulnerable Road Users
Don't forget part two: read how hazard perception is scored. Booked your test? Find your nearest theory test centre, or book on the official GOV.UK booking service (£23).
All practice questions are original study material written to the current DVSA car theory test syllabus and The Highway Code. They are not actual DVSA exam questions. This site is an independent study resource and is not affiliated with or endorsed by the DVSA.