Key concepts of physics
50 revision questions with answers for P1 Key concepts of physics in Pearson Edexcel GCSE Combined Science (spec 1SC0). Practise with flashcards, a topic quiz, a random quiz across the course, 5 crosswords, or read every question and answer below.
All 50 questions and answers
Question 1 · Spec P1.1
What is the SI unit of length?
Answer:Metre, symbol m.Question 2 · Spec P1.1
What is the SI unit of mass?
Answer:Kilogram, symbol kg.Question 3 · Spec P1.1
What is the SI unit of time?
Answer:Second, symbol s.Question 4 · Spec P1.1
What is the SI unit of electric current?
Answer:Ampere, symbol A.Question 5 · Spec P1.1
What is the SI base unit of temperature?
Answer:Kelvin, symbol K.Question 6 · Spec P1.1
What is the SI unit of amount of substance?
Answer:Mole, symbol mol.Question 7 · Spec P1.1
What unit measures frequency?
Answer:Hertz, Hz; one complete cycle per second.Question 8 · Spec P1.1
What unit measures force?
Answer:Newton, N.Question 9 · Spec P1.1
What unit measures energy?
Answer:Joule, J.Question 10 · Spec P1.1
What unit measures power?
Answer:Watt, W.Question 11 · Spec P1.1
What unit measures pressure?
Answer:Pascal, Pa.Question 12 · Spec P1.1
What unit measures electric charge?
Answer:Coulomb, C.Question 13 · Spec P1.1
What unit measures potential difference?
Answer:Volt, V.Question 14 · Spec P1.1
What unit measures electrical resistance?
Answer:Ohm, symbol Ω.Question 15 · Spec P1.1
What unit measures magnetic flux density?
Answer:Tesla, T.Question 16 · Spec P1.2
What multiplier does giga, G, represent?
Answer:10⁹, or one billion.Question 17 · Spec P1.2
What multiplier does mega, M, represent?
Answer:10⁶, or one million.Question 18 · Spec P1.2
What multiplier does kilo, k, represent?
Answer:10³, or one thousand.Question 19 · Spec P1.2
What multiplier does centi, c, represent?
Answer:10⁻², or one-hundredth.Question 20 · Spec P1.2
What multiplier does milli, m, represent?
Answer:10⁻³, or one-thousandth.Question 21 · Spec P1.2
What multiplier does micro, μ, represent?
Answer:10⁻⁶, or one-millionth.Question 22 · Spec P1.2
What multiplier does nano, n, represent?
Answer:10⁻⁹, or one-billionth.Question 23 · Spec P1.3
Convert 3.5 km to metres.
Answer:3.5 × 1,000 = 3,500 m.Question 24 · Spec P1.3
Convert 240 cm to metres.
Answer:240/100 = 2.40 m.Question 25 · Spec P1.3
Convert 18 mm to metres.
Answer:18/1,000 = 0.018 m.Question 26 · Spec P1.3
Convert 450 µm to metres.
Answer:450 × 10⁻⁶ = 0.000450 m.Question 27 · Spec P1.3
Convert 600 nm to metres.
Answer:600 × 10⁻⁹ = 0.000000600 m.Question 28 · Spec P1.3
Convert 2.5 kg to grams.
Answer:2.5 × 1,000 = 2,500 g.Question 29 · Spec P1.3
Convert 75 g to kilograms.
Answer:75/1,000 = 0.075 kg.Question 30 · Spec P1.3
Convert 4.0 mA to amperes.
Answer:4.0/1,000 = 0.0040 A.Question 31 · Spec P1.3
Convert 0.35 A to milliamperes.
Answer:0.35 × 1,000 = 350 mA.Question 32 · Spec P1.3
Convert 2.4 kW to watts.
Answer:2.4 × 1,000 = 2,400 W.Question 33 · Spec P1.3
Convert 5.0 MJ to joules.
Answer:5.0 × 10⁶ = 5,000,000 J.Question 34 · Spec P1.3
Convert 3.2 GHz to hertz.
Answer:3.2 × 10⁹ Hz.Question 35 · Spec P1.3
Convert 2.5 hours to seconds.
Answer:2.5 × 3,600 = 9,000 s.Question 36 · Spec P1.3
Convert 7.5 minutes to seconds.
Answer:7.5 × 60 = 450 s.Question 37 · Spec P1.3
Convert 1,800 seconds to hours.
Answer:1,800/3,600 = 0.50 h.Question 38 · Spec P1.3
Convert 72 km/h to m/s.
Answer:72 × 1,000/3,600 = 20 m/s.Question 39 · Spec P1.4
What is the standard-form convention?
Answer:Write a x 10^n, where 1 <= a < 10 and n is an integer.Question 40 · Spec P1.4
Write 45,000 in standard form.
Answer:4.5 × 10⁴.Question 41 · Spec P1.4
Write 0.00032 in standard form.
Answer:3.2 × 10⁻⁴.Question 42 · Spec P1.4
Write 6.4 × 10⁵ as an ordinary number.
Answer:640,000.Question 43 · Spec P1.4
Write 8.1 × 10⁻³ as an ordinary decimal.
Answer:0.0081.Question 44 · Spec P1.4
Round 3.746 to three significant figures.
Answer:3.75.Question 45 · Spec P1.4
Round 0.004826 to two significant figures.
Answer:0.0048; leading zeros do not count as significant figures.Question 46 · Spec P1.4
How many significant figures are in 0.0204?
Answer:Three: 2, the internal zero and 4.Question 47 · Spec P1.4
Why can 2.50 communicate more precision than 2.5?
Answer:The final zero shows a third significant figure and a finer stated resolution.Question 48 · Spec P1.4
Calculate (3.0 × 10⁴) × (2.0 × 10³).
Answer:6.0 × 10⁷.Question 49 · Spec P1.4
Calculate (8.0 × 10⁶)/(2.0 × 10²).
Answer:4.0 × 10⁴.Question 50 · Spec P1.4
Why should calculation results not be rounded at every intermediate step?
Answer:Repeated rounding can accumulate error; retain working precision and round the final answer appropriately.
More Pearson Edexcel GCSE Combined Science topics
- B1 Key concepts in biology
- B2 Cells and control
- B3 Genetics
- B4 Natural selection and genetic modification
- B5 Health, disease and the development of medicines
- B6 Plant structures and their functions
- B7 Animal coordination, control and homeostasis
- B8 Exchange and transport in animals
- B9 Ecosystems and material cycles
- C1 Key concepts in chemistry
- C2 States of matter and mixtures
- C3 Chemical change
- C4 Extracting metals and equilibria
- C6 Groups in the periodic table
- C7 Rates of reaction and energy changes
- C8 Fuels and Earth science
- P1 Key concepts of physics
- P2 Motion and forces
- P3 Conservation of energy
- P4 Waves
- P5 Light and the electromagnetic spectrum
- P6 Radioactivity
- P8 Energy - forces doing work
- P9 Forces and their effects
- P10 Electricity and circuits
- P12 Magnetism and the motor effect
- P13 Electromagnetic induction
- P14 Particle model
- P15 Forces and matter
Other Combined science courses: AQA GCSE Combined Science: Trilogy.