Free WJEC GCSE Physics (3420) Exam Questions and Answers
WJEC GCSE Physics (3420) is WJEC's GCSE Physics qualification, specification 3420, taken in Wales. It is sat at Foundation or Higher tier. The questions here come from WJEC's published question papers from June 2017 to June 2022, with answers and marking guidance taken from WJEC's own mark schemes. Written-answer questions let you work out your answer and then reveal what the mark scheme accepts; diagrams, graphs and source material appear with the questions that use them.
Looking for WJEC GCSE Physics (3420) exam dumps or ExamTopics questions? These practice questions cover the same ground with verified answers and explanations, a downloadable PDF and a full practice test, kept current as WJEC updates the exam.
Last updated: October 13, 2026
- Provider
- WJEC
- Questions in our bank
- 1000+
- Free to read
- First 10, with answers
- Our test mode duration & pass mark
- 130 mins · 70%
- Verified answers
- Reviewed weekly
- Practice format
- Written answers
Recommended: Switch to Test Mode to start a practice test that simulates the real exam experience.
Question #1
The diagram below shows part of the electromagnetic (em) spectrum. | Microwaves | Infra-red | Visible light | Ultraviolet | Use only the regions of the em spectrum shown in the diagram to answer the following questions. Name the region of the em spectrum with the longest wavelength.
Type your answer, then reveal.
Correct answer: Microwaves
Explanation
One mark for microwaves.
Continue with WJEC GCSE Physics (3420)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in WJEC GCSE Physics (3420), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Question #2
The diagram below shows part of the electromagnetic (em) spectrum. | Microwaves | Infra-red | Visible light | Ultraviolet | Use only the regions of the em spectrum shown in the diagram to answer the following questions. Name the region of the em spectrum with the lowest frequency.
Type your answer, then reveal.
Correct answer: Microwaves
Explanation
One mark for microwaves.
Continue with WJEC GCSE Physics (3420)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in WJEC GCSE Physics (3420), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Question #3
Name one region of the em spectrum not shown in the diagram in part (a).
Type your answer, then reveal.
Correct answer: Radio waves, X-rays or gamma rays (any one)
Explanation
One mark for any one of radio [waves], X-rays or gamma [rays].
Continue with WJEC GCSE Physics (3420)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in WJEC GCSE Physics (3420), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Question #4
Waves can either be described as transverse or longitudinal. Sound waves are an example of longitudinal waves whereas visible light waves are transverse. Tick (✓) the two correct statements below.
Select 2 answers.
Correct answer: C, D
Explanation
One mark for each correct box ticked (3rd and 4th boxes). Subtract 1 mark for each additional box ticked (minimum 0).
Continue with WJEC GCSE Physics (3420)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in WJEC GCSE Physics (3420), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Question #5
The table below gives information about the frequency and wavelength of sound waves in different materials. | Material | Frequency (Hz) | Wavelength (m) | | air | 170 | 2 | | water | 170 | 9 | | iron | 170 | 29 | Use the information in the table to answer the questions below. Use the equation: wave speed = frequency × wavelength to calculate the speed of sound waves in air.
Type your answer, then reveal.
Correct answer: 340 m/s
Explanation
Substitution: 170 × 2 (1 mark). Wave speed = 340 m/s (1 mark). Multiple selections not credited unless the correct final answer is given.
Continue with WJEC GCSE Physics (3420)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in WJEC GCSE Physics (3420), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Question #6
The table below gives information about the frequency and wavelength of sound waves in different materials. | Material | Frequency (Hz) | Wavelength (m) | | air | 170 | 2 | | water | 170 | 9 | | iron | 170 | 29 | Use the information in the table to answer the questions below. The sound wave travels from air into water. Its frequency stays the same. Without further calculation explain whether its speed increases, decreases or stays the same.
Type your answer, then reveal.
Correct answer: The speed increases, because the wavelength increases (frequency stays the same).
Explanation
One mark for stating the wavelength increases (or equivalent); just stating the wavelength values is not enough. One mark for the speed increasing. The marks are independent.
Continue with WJEC GCSE Physics (3420)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in WJEC GCSE Physics (3420), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Question #7
The diagram below shows a ring main circuit for a house. Label the earth, neutral and live wires on the diagram above.
Type your answer, then reveal.
Correct answer: Top label: neutral; middle label: earth; bottom label: live
Explanation
3 correct = 2 marks; 1 or 2 correct = 1 mark.
Continue with WJEC GCSE Physics (3420)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in WJEC GCSE Physics (3420), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Question #8
Underline a word in each bracket to correctly complete the sentences below. The ring main is a looped (double / parallel / series) circuit. The cables in the ring main can be made (thinner / thicker / longer) because there are 2 paths for the (voltage / current / power).
Type your answer, then reveal.
Correct answer: parallel; thinner; current
Explanation
One mark each: parallel, thinner, and the word 'current' in the final sentence (the cables can be thinner because the current in each part is smaller).
Continue with WJEC GCSE Physics (3420)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in WJEC GCSE Physics (3420), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Question #9
A 1.2 kW kettle is plugged into the ring main. It is used for 0.5 hours in a day. Use equations from page 2 to answer the following questions. Calculate the number of units (kWh) the kettle uses each day.
Type your answer, then reveal.
Correct answer: 0.6 kWh
Explanation
Substitution: 1.2 × 0.5 (1 mark). Units used = 0.60 kWh (1 mark).
Continue with WJEC GCSE Physics (3420)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in WJEC GCSE Physics (3420), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Question #10
A 1.2 kW kettle is plugged into the ring main. It is used for 0.5 hours in a day. Use equations from page 2 to answer the following questions. Calculate the cost of using the kettle each day if electricity costs 15 p per unit.
Type your answer, then reveal.
Correct answer: 9p
Explanation
Substitution: 0.60 (follow through from (b)(i)) × 15 (1 mark). Cost = 9p (1 mark). Not £0.09p.
Continue with WJEC GCSE Physics (3420)
Unlock the full question bank
You have read the first 10 questions. A subscription opens every question in WJEC GCSE Physics (3420), the full timed practice test, and your progress and weak-topic reporting.
Single exam
$19.99for 30 days
Full question bank and practice test for one exam, for 30 days.
Single exam
$49.99for 1 year
One exam for a full year. Nothing renews and nothing to cancel.
Full access
$39.99/mo
Every exam in the catalogue, month to month.
Full access
$199.99/yr
Every exam in the catalogue for a year.
Already subscribed? Sign in to pick up where you left off.
Discussion
Explain your reasoning, not just the letterOther WJEC certifications
- WJEC GCSE Mathematics (3300) (opens in a new tab)
- WJEC GCSE Combined Science (3430) (opens in a new tab)
- WJEC GCSE Biology (3400) (opens in a new tab)
- WJEC GCSE Chemistry (3410) (opens in a new tab)
- WJEC GCSE French (3800) (opens in a new tab)
- WJEC GCSE German (3820) (opens in a new tab)
- WJEC GCSE History (3100) (opens in a new tab)
- WJEC GCSE Business (3510) (opens in a new tab)
- WJEC GCSE Geography (3110) (opens in a new tab)
- WJEC GCSE Design and Technology (3601) (opens in a new tab)
- WJEC GCSE English Literature (3720) (opens in a new tab)
- WJEC GCSE English Language (3700) (opens in a new tab)
Reviews
Write a review★★★★★
Exam Practice is worth every penny. The mock exams are realistic, and the feedback helped me focus on key areas.
Amit SharmaVerified buyer
★★★★★
I highly recommend Exam Practice. The feedback after each test helped me improve significantly, and I passed my exams easily.
Oscar NyströmVerified buyer
★★★★★
This platform is a lifesaver. The practice questions and explanations are so detailed. It’s the best study tool I’ve ever used.
Hannah SmithVerified buyer