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ACT Physics Questions
Practise physics (science) for the ACT: 10 multiple-choice questions, each with the correct answer and a worked explanation. Click an option to check it, or “New questions” for another set.
Physics practice
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Q1.Absolute zero is:
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Answer: B — −273.15 °C
0 K = −273.15 °C.
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Q2.A body with initial velocity 17 m/s accelerates at 3 m/s² for 8 s. Find the distance covered.
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Answer: B — 232 m
s = ut + ½at² = 17×8 + ½×3×8² = 232 m.
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Q3.A transformer works on the principle of:
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Answer: A — Mutual induction
A changing current in one coil induces a voltage in the other.
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Q4.What force is needed to accelerate a 26 kg mass at 3 m/s²?
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Answer: B — 78 N
F = ma = 26 × 3 = 78 N.
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Q5.The SI unit of force is the:
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Answer: D — Newton
1 newton = 1 kg·m/s².
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Q6.A current of 1 A flows through a 25 Ω resistor. What is the potential difference across it?
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Answer: C — 25 V
Ohm’s law: V = IR = 1 × 25 = 25 V.
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Q7.Sound cannot travel through:
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Answer: D — Vacuum
Sound needs a medium; it cannot travel through a vacuum.
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Q8.Find the power dissipated when 0.5 A flows through a 5 Ω resistor.
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Answer: B — 1.25 W
P = I²R = 0.5² × 5 = 1.25 W.
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Q9.The phenomenon responsible for the blue colour of the sky is:
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Answer: A — Rayleigh scattering
Shorter (blue) wavelengths are scattered more by air molecules.
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Q10.A body starts at 20 m/s and accelerates uniformly at 3 m/s² for 6 s. Find its final velocity.
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Answer: A — 38 m/s
v = u + at = 20 + 3×6 = 38 m/s.
How to approach physics questions
Write the formula before substituting and keep SI units throughout. Most numerical questions use one of: v = u + at, s = ut + ½at², F = ma, KE = ½mv², V = IR, P = I²R.
About ACT
ACT — conducted by ACT, Inc.. US college admission test with English, Math and Reading, plus an optional Science section.
Original practice questions written for this site in the style and difficulty of each exam’s syllabus. They are not past papers and the site is not affiliated with any exam body. Exam patterns, marking schemes and syllabi change — always check the latest official notification.
ACT practice topics
| Topic | Section | Question source |
|---|---|---|
| Algebra | Mathematics | Calculated (new numbers every set) |
| Geometry & Mensuration | Mathematics | Calculated (new numbers every set) |
| Probability & Combinatorics | Mathematics | Calculated (new numbers every set) |
| English Grammar | English | Question bank |
| Physics | Science | Calculated + question bank |
| Chemistry | Science | Calculated + question bank |