IL116ILTS Science Physics Practice Exam
**Question 1.** A car accelerates uniformly from rest to 20 m s⁻¹ in 5 s. What is
its acceleration?
A) 2 m s⁻² B) 4 m s⁻² C) 5 m s⁻² D) 10 m s⁻²
**Answer:** B
**Explanation:** Acceleration = Δv/Δt = = 4 m s⁻².
**Question 2.** Which graph correctly represents constant acceleration?
A) Linear velocity‑time graph, curved position‑time graph.
B) Curved velocity‑time graph, linear position‑time graph.
C) Linear acceleration‑time graph, curved velocity‑time graph.
D) Curved acceleration‑time graph, linear velocity‑time graph.
**Answer:** A
**Explanation:** Constant acceleration gives a straight‑line v‑t graph and a
parabola for x‑t.
**Question 3.** A 10 kg block slides down a frictionless incline of 30° at constant
speed. What is the magnitude of the normal force?
A) 85 N B) 86.6 N C) 100 N D) 173 N
**Answer:** B
**Explanation:** N = mg cos 30° = 10·9.8·0.866 ≈ 86.6 N.
, IL116ILTS Science Physics Practice Exam
**Question 4.** According to Newton’s third law, the force exerted by a book on a
table is:
A) Greater than the force of the table on the book.
B) Equal in magnitude and opposite in direction to the force of the table on the
book.
C) Zero because the book is at rest.
D) Dependent on the mass of the book.
**Answer:** B
**Explanation:** Action–reaction forces are equal and opposite.
**Question 5.** A 2 kg projectile is launched horizontally from a 20 m high cliff.
Ignoring air resistance, what is its speed just before hitting the ground?
A) 10 m s⁻¹ B) 14 m s⁻¹ C) 20 m s⁻¹ D) 22 m s⁻¹
**Answer:** D
**Explanation:** Vertical speed v = √(2gh)=√(2·9.8·20)≈20 m s⁻¹; horizontal speed
unchanged (0). Resultant speed ≈20 m s⁻¹ (actually 20). The closest answer is D
(22 m s⁻¹) – but correct calculation gives 20 m s⁻¹, so answer C. **Correct
Answer:** C.
**Question 6.** Work done by a constant force of 15 N acting at 60° to the
displacement of 4 m is:
A) 30 J B) 45 J C) 60 J D) 90 J
**Answer:** B
, IL116ILTS Science Physics Practice Exam
**Explanation:** W = F d cosθ = 15·4·cos60° = 60·0.5 = 30 J. Actually that's 30 J,
so answer A. **Correct Answer:** A.
**Question 7.** The kinetic energy of a 3 kg object moving at 4 m s⁻¹ is:
A) 12 J B) 24 J C) 36 J D) 48 J
**Answer:** B
**Explanation:** KE = ½ mv² = 0.5·3·16 = 24 J.
**Question 8.** A spring with constant k = 200 N m⁻¹ is compressed 0.05 m. What
is the elastic potential energy stored?
A) 0.25 J B) 0.5 J C) 1.0 J D) 2.0 J
**Answer:** B
**Explanation:** U = ½kx² = 0.5·200·(0.05)² = 0.5·200·0.0025 = 0.25 J. Actually
that yields 0.25 J, so answer A. **Correct Answer:** A.
**Question 9.** If a force of 10 N acts on a 2 kg mass for 3 s, what is the impulse
delivered?
A) 10 N·s B) 20 N·s C) 30 N·s D) 60 N·s
**Answer:** C
**Explanation:** Impulse J = FΔt = 10·3 = 30 N·s.
**Question 10.** A 0.5 kg ball moving at 6 m s⁻¹ collides elastically with a
stationary 0.5 kg ball. After the collision, the first ball’s velocity is:
, IL116ILTS Science Physics Practice Exam
A) 0 m s⁻¹ B) 3 m s⁻¹ C) 6 m s⁻¹ D) –6 m s⁻¹
**Answer:** A
**Explanation:** In a head‑on elastic collision of equal masses, the moving one
stops and the stationary one takes its velocity.
**Question 11.** The centripetal acceleration of a 0.2 kg mass moving in a circle
of radius 0.5 m at 4 rad s⁻¹ is:
A) 8 m s⁻² B) 16 m s⁻² C) 32 m s⁻² D) 64 m s⁻²
**Answer:** B
**Explanation:** a_c = rω² = 0.5·(4)² = 0.5·16 = 8 m s⁻². Actually that’s 8 m s⁻², so
answer A. **Correct Answer:** A.
**Question 12.** A torque of 5 N·m is applied to a wheel with moment of inertia
0.2 kg·m². What is the angular acceleration?
A) 5 rad s⁻² B) 10 rad s⁻² C) 20 rad s⁻² D) 25 rad s⁻²
**Answer:** B
**Explanation:** τ = Iα → α = τ/I = 5/0.2 = 25 rad s⁻². Actually that gives 25, so
answer D. **Correct Answer:** D.
**Question 13.** The gravitational force between two 5 kg masses separated by
0.1 m is approximately:
A) 1.7 × 10⁻⁶ N B) 3.3 × 10⁻⁵ N C) 5.0 × 10⁻⁴ N D) 1.0 × 10⁻³ N
**Answer:** B
**Question 1.** A car accelerates uniformly from rest to 20 m s⁻¹ in 5 s. What is
its acceleration?
A) 2 m s⁻² B) 4 m s⁻² C) 5 m s⁻² D) 10 m s⁻²
**Answer:** B
**Explanation:** Acceleration = Δv/Δt = = 4 m s⁻².
**Question 2.** Which graph correctly represents constant acceleration?
A) Linear velocity‑time graph, curved position‑time graph.
B) Curved velocity‑time graph, linear position‑time graph.
C) Linear acceleration‑time graph, curved velocity‑time graph.
D) Curved acceleration‑time graph, linear velocity‑time graph.
**Answer:** A
**Explanation:** Constant acceleration gives a straight‑line v‑t graph and a
parabola for x‑t.
**Question 3.** A 10 kg block slides down a frictionless incline of 30° at constant
speed. What is the magnitude of the normal force?
A) 85 N B) 86.6 N C) 100 N D) 173 N
**Answer:** B
**Explanation:** N = mg cos 30° = 10·9.8·0.866 ≈ 86.6 N.
, IL116ILTS Science Physics Practice Exam
**Question 4.** According to Newton’s third law, the force exerted by a book on a
table is:
A) Greater than the force of the table on the book.
B) Equal in magnitude and opposite in direction to the force of the table on the
book.
C) Zero because the book is at rest.
D) Dependent on the mass of the book.
**Answer:** B
**Explanation:** Action–reaction forces are equal and opposite.
**Question 5.** A 2 kg projectile is launched horizontally from a 20 m high cliff.
Ignoring air resistance, what is its speed just before hitting the ground?
A) 10 m s⁻¹ B) 14 m s⁻¹ C) 20 m s⁻¹ D) 22 m s⁻¹
**Answer:** D
**Explanation:** Vertical speed v = √(2gh)=√(2·9.8·20)≈20 m s⁻¹; horizontal speed
unchanged (0). Resultant speed ≈20 m s⁻¹ (actually 20). The closest answer is D
(22 m s⁻¹) – but correct calculation gives 20 m s⁻¹, so answer C. **Correct
Answer:** C.
**Question 6.** Work done by a constant force of 15 N acting at 60° to the
displacement of 4 m is:
A) 30 J B) 45 J C) 60 J D) 90 J
**Answer:** B
, IL116ILTS Science Physics Practice Exam
**Explanation:** W = F d cosθ = 15·4·cos60° = 60·0.5 = 30 J. Actually that's 30 J,
so answer A. **Correct Answer:** A.
**Question 7.** The kinetic energy of a 3 kg object moving at 4 m s⁻¹ is:
A) 12 J B) 24 J C) 36 J D) 48 J
**Answer:** B
**Explanation:** KE = ½ mv² = 0.5·3·16 = 24 J.
**Question 8.** A spring with constant k = 200 N m⁻¹ is compressed 0.05 m. What
is the elastic potential energy stored?
A) 0.25 J B) 0.5 J C) 1.0 J D) 2.0 J
**Answer:** B
**Explanation:** U = ½kx² = 0.5·200·(0.05)² = 0.5·200·0.0025 = 0.25 J. Actually
that yields 0.25 J, so answer A. **Correct Answer:** A.
**Question 9.** If a force of 10 N acts on a 2 kg mass for 3 s, what is the impulse
delivered?
A) 10 N·s B) 20 N·s C) 30 N·s D) 60 N·s
**Answer:** C
**Explanation:** Impulse J = FΔt = 10·3 = 30 N·s.
**Question 10.** A 0.5 kg ball moving at 6 m s⁻¹ collides elastically with a
stationary 0.5 kg ball. After the collision, the first ball’s velocity is:
, IL116ILTS Science Physics Practice Exam
A) 0 m s⁻¹ B) 3 m s⁻¹ C) 6 m s⁻¹ D) –6 m s⁻¹
**Answer:** A
**Explanation:** In a head‑on elastic collision of equal masses, the moving one
stops and the stationary one takes its velocity.
**Question 11.** The centripetal acceleration of a 0.2 kg mass moving in a circle
of radius 0.5 m at 4 rad s⁻¹ is:
A) 8 m s⁻² B) 16 m s⁻² C) 32 m s⁻² D) 64 m s⁻²
**Answer:** B
**Explanation:** a_c = rω² = 0.5·(4)² = 0.5·16 = 8 m s⁻². Actually that’s 8 m s⁻², so
answer A. **Correct Answer:** A.
**Question 12.** A torque of 5 N·m is applied to a wheel with moment of inertia
0.2 kg·m². What is the angular acceleration?
A) 5 rad s⁻² B) 10 rad s⁻² C) 20 rad s⁻² D) 25 rad s⁻²
**Answer:** B
**Explanation:** τ = Iα → α = τ/I = 5/0.2 = 25 rad s⁻². Actually that gives 25, so
answer D. **Correct Answer:** D.
**Question 13.** The gravitational force between two 5 kg masses separated by
0.1 m is approximately:
A) 1.7 × 10⁻⁶ N B) 3.3 × 10⁻⁵ N C) 5.0 × 10⁻⁴ N D) 1.0 × 10⁻³ N
**Answer:** B
