PHYRES21UIO(148) Practice
Questions And Correct
Answers (Verified Answers)
Plus Rationale 2026 2027
Q&A| Instant Download Pdf.
1. Which SI unit is used to measure force?
A. Joule
B. Watt
C. Newton
D. Pascal
Rationale: The newton (N) is the SI unit of force and is defined as
kg·m/s².
2. Which quantity is a scalar?
A. Velocity
B. Acceleration
C. Displacement
D. Speed
Rationale: Speed has magnitude only, whereas velocity, acceleration,
and displacement have both magnitude and direction.
3. What is the SI unit of energy?
,A. Newton
B. Watt
C. Joule
D. Pascal
Rationale: Energy is measured in joules (J).
4. Which equation represents Newton's second law?
A. F = mv
B. F = ma
C. P = F/A
D. W = mg
Rationale: Newton's second law states that net force equals mass
multiplied by acceleration.
5. A 10-kg object accelerates at 2 m/s². What is the net force?
A. 5 N
B. 10 N
C. 20 N
D. 40 N
Rationale: F = ma = 10 kg × 2 m/s² = 20 N.
6. Which quantity describes how quickly velocity changes?
A. Displacement
B. Momentum
C. Acceleration
D. Work
Rationale: Acceleration is the rate of change of velocity with respect
to time.
,7. What is the approximate acceleration due to gravity near Earth's
surface?
A. 1.8 m/s²
B. 5.0 m/s²
C. 9.8 m/s²
D. 98 m/s²
Rationale: Earth's gravitational acceleration is approximately 9.8
m/s².
8. Which of the following is a vector quantity?
A. Mass
B. Temperature
C. Time
D. Velocity
Rationale: Velocity includes both speed and direction, making it a
vector.
9. What does displacement describe?
A. Total path length traveled
B. Change in position with direction
C. Rate of energy transfer
D. Magnitude of acceleration
Rationale: Displacement is the vector change from an object's initial
to final position.
10. An object travels 100 m in 20 s. What is its average speed?
, A. 2 m/s
B. 5 m/s
C. 20 m/s
D. 50 m/s
Rationale: Average speed = distance/time = 100/20 = 5 m/s.
Section II — Motion and Kinematics
11. An object initially at rest accelerates at 3 m/s² for 4 seconds.
What is its final velocity?
A. 7 m/s
B. 10 m/s
C. 12 m/s
D. 16 m/s
Rationale: v = u + at = 0 + (3)(4) = 12 m/s.
12. Which equation is used to calculate displacement during
constant acceleration?
A. v = d/t
B. s = ut + ½at²
C. F = ma
D. P = W/t
Rationale: For constant acceleration, displacement is given by s = ut +
½at².
13. If an object's velocity is constant, its acceleration is:
A. Increasing
B. Decreasing
Questions And Correct
Answers (Verified Answers)
Plus Rationale 2026 2027
Q&A| Instant Download Pdf.
1. Which SI unit is used to measure force?
A. Joule
B. Watt
C. Newton
D. Pascal
Rationale: The newton (N) is the SI unit of force and is defined as
kg·m/s².
2. Which quantity is a scalar?
A. Velocity
B. Acceleration
C. Displacement
D. Speed
Rationale: Speed has magnitude only, whereas velocity, acceleration,
and displacement have both magnitude and direction.
3. What is the SI unit of energy?
,A. Newton
B. Watt
C. Joule
D. Pascal
Rationale: Energy is measured in joules (J).
4. Which equation represents Newton's second law?
A. F = mv
B. F = ma
C. P = F/A
D. W = mg
Rationale: Newton's second law states that net force equals mass
multiplied by acceleration.
5. A 10-kg object accelerates at 2 m/s². What is the net force?
A. 5 N
B. 10 N
C. 20 N
D. 40 N
Rationale: F = ma = 10 kg × 2 m/s² = 20 N.
6. Which quantity describes how quickly velocity changes?
A. Displacement
B. Momentum
C. Acceleration
D. Work
Rationale: Acceleration is the rate of change of velocity with respect
to time.
,7. What is the approximate acceleration due to gravity near Earth's
surface?
A. 1.8 m/s²
B. 5.0 m/s²
C. 9.8 m/s²
D. 98 m/s²
Rationale: Earth's gravitational acceleration is approximately 9.8
m/s².
8. Which of the following is a vector quantity?
A. Mass
B. Temperature
C. Time
D. Velocity
Rationale: Velocity includes both speed and direction, making it a
vector.
9. What does displacement describe?
A. Total path length traveled
B. Change in position with direction
C. Rate of energy transfer
D. Magnitude of acceleration
Rationale: Displacement is the vector change from an object's initial
to final position.
10. An object travels 100 m in 20 s. What is its average speed?
, A. 2 m/s
B. 5 m/s
C. 20 m/s
D. 50 m/s
Rationale: Average speed = distance/time = 100/20 = 5 m/s.
Section II — Motion and Kinematics
11. An object initially at rest accelerates at 3 m/s² for 4 seconds.
What is its final velocity?
A. 7 m/s
B. 10 m/s
C. 12 m/s
D. 16 m/s
Rationale: v = u + at = 0 + (3)(4) = 12 m/s.
12. Which equation is used to calculate displacement during
constant acceleration?
A. v = d/t
B. s = ut + ½at²
C. F = ma
D. P = W/t
Rationale: For constant acceleration, displacement is given by s = ut +
½at².
13. If an object's velocity is constant, its acceleration is:
A. Increasing
B. Decreasing
