ETEA / KMU MDCAT (KPK) Physics Force & Motion — Set 2

Force & Motion MCQs set 2 for ETEA / KMU MDCAT (KPK) Physics — 20 solved questions.

ETEA / KMU MDCAT (KPK) Physics Force & Motion — Set 2

  1. Question 1

    Q1. A 16-year-old athlete feels muscle fatigue during a sprint. Which process is responsible for the rapid ATP production in this situation?

    • A) Anaerobic Respiration
    • B) Aerobic Respiration
    • C) Muscle Glycolysis
    • D) Lactic Acid Fermentation

    Answer: Lactic Acid Fermentation

    Explanation: Lactic acid fermentation is responsible for rapid ATP production; anaerobic respiration does not provide enough ATP, aerobic respiration is too slow.

  2. Question 2

    Q2. A person is moving a heavy box across the floor. If the force applied to the box increases, what happens to the net force on the box?

    • A) Decreases
    • B) Increases
    • C) Remains constant
    • D) Depends on the surface friction

    Answer: Increases

    Explanation: As force increases, net force on the box also increases according to Newton's first law of motion.

  3. Question 3

    Q3. A car accelerates from rest to 10 m/s in 2 seconds. What is the average acceleration of the car?

    • A) 5 m/s^2
    • B) 10 m/s^2
    • C) 20 m/s^2
    • D) 25 m/s^2

    Answer: 10 m/s^2

    Explanation: Average acceleration is calculated as change in velocity divided by time taken, which equals 10 m/s / 2 s.

  4. Question 4

    Q4. A 60 kg person is standing on a scale. If the normal force exerted on them is 600 N, what is their acceleration?

    • A) 0 m/s^2
    • B) 0.1 m/s^2
    • C) 0.5 m/s^2
    • D) 1 m/s^2

    Answer: 0 m/s^2

    Explanation: Since the normal force equals the person's weight, their acceleration is zero, assuming no other forces are acting.

  5. Question 5

    Q5. A force of 50 N acts on an object of mass 10 kg. What is the acceleration of the object?

    • A) 0.1 m/s^2
    • B) 0.5 m/s^2
    • C) 2 m/s^2
    • D) 5 m/s^2

    Answer: 0.5 m/s^2

    Explanation: Acceleration is calculated as force divided by mass, which equals 50 N / 10 kg.

  6. Question 6

    Q6. A spring has a spring constant of 100 N/m. What is the force required to displace it by 0.5 m?

    • A) 20 N
    • B) 50 N
    • C) 100 N
    • D) 500 N

    Answer: 100 N

    Explanation: Force is calculated as spring constant multiplied by displacement, which equals 100 N/m * 0.5 m.

  7. Question 7

    Q7. A car is traveling at 20 m/s. If it decelerates uniformly to 10 m/s in 2 seconds, what is its deceleration?

    • A) 5 m/s^2
    • B) 10 m/s^2
    • C) 20 m/s^2
    • D) 25 m/s^2

    Answer: 10 m/s^2

    Explanation: Deceleration is calculated as negative change in velocity divided by time taken, which equals -10 m/s / 2 s.

  8. Question 8

    Q8. A person is standing on a scale in an elevator. If the elevator accelerates upward at 5 m/s^2, what is the normal force exerted on the person?

    • A) 600 N
    • B) 650 N
    • C) 700 N
    • D) 750 N

    Answer: 700 N

    Explanation: Normal force equals the person's weight plus the force due to acceleration, which equals 600 N + 5 kg * 5 m/s^2.

  9. Question 9

    Q9. A ball is thrown upward with an initial velocity of 20 m/s. What is its velocity after 2 seconds?

    • A) 10 m/s
    • B) 15 m/s
    • C) 20 m/s
    • D) 25 m/s

    Answer: 10 m/s

    Explanation: Velocity decreases due to acceleration due to gravity, which equals 20 m/s - 9.8 m/s^2 * 2 s.

  10. Question 10

    Q10. A force of 100 N acts on an object of mass 20 kg. What is the acceleration of the object?

    • A) 0.1 m/s^2
    • B) 0.5 m/s^2
    • C) 2 m/s^2
    • D) 5 m/s^2

    Answer: 2 m/s^2

    Explanation: Acceleration is calculated as force divided by mass, which equals 100 N / 20 kg.

  11. Question 11

    Q11. A spring has a spring constant of 50 N/m. What is the force required to displace it by 1 m?

    • A) 10 N
    • B) 20 N
    • C) 50 N
    • D) 100 N

    Answer: 50 N

    Explanation: Force is calculated as spring constant multiplied by displacement, which equals 50 N/m * 1 m.

  12. Question 12

    Q12. A car is traveling at 30 m/s. If it accelerates uniformly to 40 m/s in 3 seconds, what is its acceleration?

    • A) 2 m/s^2
    • B) 4 m/s^2
    • C) 6 m/s^2
    • D) 8 m/s^2

    Answer: 6 m/s^2

    Explanation: Acceleration is calculated as change in velocity divided by time taken, which equals (40 m/s - 30 m/s) / 3 s.

  13. Question 13

    Q13. A force of 200 N acts on an object of mass 30 kg. What is the acceleration of the object?

    • A) 0.1 m/s^2
    • B) 0.5 m/s^2
    • C) 2 m/s^2
    • D) 5 m/s^2

    Answer: 2 m/s^2

    Explanation: Acceleration is calculated as force divided by mass, which equals 200 N / 30 kg.

  14. Question 14

    Q14. A spring has a spring constant of 200 N/m. What is the force required to displace it by 0.5 m?

    • A) 10 N
    • B) 20 N
    • C) 100 N
    • D) 200 N

    Answer: 100 N

    Explanation: Force is calculated as spring constant multiplied by displacement, which equals 200 N/m * 0.5 m.

  15. Question 15

    Q15. A person is standing on a scale in an elevator. If the elevator accelerates downward at 5 m/s^2, what is the normal force exerted on the person?

    • A) 600 N
    • B) 550 N
    • C) 500 N
    • D) 450 N

    Answer: 500 N

    Explanation: Normal force equals the person's weight minus the force due to acceleration, which equals 600 N - 5 kg * 5 m/s^2.

  16. Question 16

    Q16. A ball is thrown upward with an initial velocity of 30 m/s. What is its velocity after 2 seconds?

    • A) 10 m/s
    • B) 15 m/s
    • C) 20 m/s
    • D) 25 m/s

    Answer: 20 m/s

    Explanation: Velocity decreases due to acceleration due to gravity, which equals 30 m/s - 9.8 m/s^2 * 2 s.

  17. Question 17

    Q17. A force of 150 N acts on an object of mass 25 kg. What is the acceleration of the object?

    • A) 0.1 m/s^2
    • B) 0.5 m/s^2
    • C) 2 m/s^2
    • D) 5 m/s^2

    Answer: 2 m/s^2

    Explanation: Acceleration is calculated as force divided by mass, which equals 150 N / 25 kg.

  18. Question 18

    Q18. A spring has a spring constant of 150 N/m. What is the force required to displace it by 1 m?

    • A) 10 N
    • B) 20 N
    • C) 50 N
    • D) 100 N

    Answer: 50 N

    Explanation: Force is calculated as spring constant multiplied by displacement, which equals 150 N/m * 1 m.

  19. Question 19

    Q19. A 50 kg person walks on a rough surface. What is the coefficient of friction between their shoes and the surface?

    • A) 0.1
    • B) 0.5
    • C) 0.7
    • D) 0.9

    Answer: 0.1

    Explanation: The coefficient of friction is typically around 0.1 on a rough surface, as it is a measure of how much force is required to move an object, and 0.1 is a common value for such surfaces.

  20. Question 20

    Q20. A car accelerates from rest to 30 m/s in 10 seconds. What is its acceleration?

    • A) 3 m/s^2
    • B) 5 m/s^2
    • C) 10 m/s^2
    • D) 15 m/s^2

    Answer: 10 m/s^2

    Explanation: The acceleration is calculated using the formula a = Δv / Δt, where Δv is the change in velocity and Δt is the time over which it occurs, giving an acceleration of 10 m/s^2.