Work, Power and Energy in Human Movement – MCQs

1. In biomechanics, work is defined as:

(A) Force × Distance moved in direction of force

(B) Mass × Acceleration

(D) Energy ÷ Distance

2. Work is measured in:

(A) Joules (J)

(B) Watts (W)

(D) Meters per second (m/s)

3. Positive work occurs when:

(A) Force and displacement are in the same direction

(B) Force and displacement are opposite

(D) Work is done against gravity only

4. Negative work occurs when:

(A) Force opposes displacement

(B) No force is applied

(D) Work is stored as potential energy

5. Power is defined as:

(A) Work done per unit time

(B) Force per unit mass

(D) Energy ÷ Force

6. The SI unit of power is:

(A) Watt (W)

(B) Joule (J)

(D) Calorie (cal)

7. Energy is defined as:

(A) Capacity to do work

(B) Mass × Acceleration

(D) Force × Speed

8. The SI unit of energy is:

(A) Joule (J)

(B) Watt (W)

(D) Pascal (Pa)

9. Kinetic energy depends on:

(A) Mass and velocity squared

(B) Force and distance

(D) Height only

10. Potential energy in human movement often refers to:

(A) Energy due to body’s position in gravitational field

(B) Energy due to muscle fatigue

(D) Heat produced in exercise

11. Elastic potential energy is stored in:

(A) Tendons and muscles

(B) Blood vessels

(D) Brain cells

12. Mechanical energy is the sum of:

(A) Kinetic and potential energy

(B) Heat and sound

(D) Mass and velocity

13. Work-energy principle states:

(A) Net work done = Change in kinetic energy

(B) Power = Mass × Acceleration

(D) Energy is never conserved

14. In eccentric muscle contraction:

(A) Negative work is done

(B) Positive work is done

(D) Work is infinite

15. In concentric contraction:

(A) Positive work is done

(B) Negative work is done

(D) Work is constant

16. Efficiency of human movement is ratio of:

(A) Mechanical work output to energy input

(B) Power to velocity

(D) Force to distance

17. The main energy currency of the human body is:

(A) ATP

(B) Glucose

(D) Glycogen

18. The rate of doing work in lifting weights depends on:

(A) Speed of lifting

(B) Mass only

(D) Gravity only

19. Which type of energy transformation occurs in muscles?

(A) Chemical to mechanical

(B) Thermal to chemical

(D) Nuclear to mechanical

20. Power in sprinting is high because:

(A) Work is done in a short time

(B) Distance is large

(D) Energy is conserved

21. In biomechanics, the rate of force production relates to:

(A) Explosive power

(B) Endurance

(D) Balance

22. Work is zero when:

(A) Displacement is zero

(B) Force is maximum

(D) Energy is conserved

23. When lifting a weight and holding it still:

(A) Work done = 0

(B) Work is maximum

(D) Negative work occurs

24. Potential energy is maximum at:

(A) Highest point of jump

(B) Start of movement

(D) Lowest point of squat

25. Kinetic energy is maximum at:

(A) Fastest movement

(B) Zero velocity

(D) Start of rest

26. In running, elastic energy is stored in:

(A) Tendons and fascia

(B) Bones only

(D) Nervous system

27. Energy conservation in biomechanics refers to:

(A) Transforming energy without loss

(B) Preventing oxygen loss

(D) Heat regulation only

28. Work done against gravity is:

(A) Force × Vertical displacement

(B) Mass × Velocity

(D) Power × Time

29. Mechanical efficiency in humans is usually around:

(A) 20–25%

(B) 40–50%

(D) 90–95%

30. Energy lost in human movement is mostly:

(A) Heat

(B) Sound

(D) Radiation

31. Jump height depends on:

(A) Work done by leg muscles

(B) Length of bones only

(D) Static balance

32. Power output during cycling is influenced by:

(A) Force applied to pedals and cadence

(B) Oxygen alone

(D) Flexibility

33. The equation for power in rotational motion is:

(A) Torque × Angular velocity

(B) Force × Acceleration

(D) Angular momentum × Radius

34. Work is a ______ quantity:

(A) Scalar

(B) Vector

(D) Dimensionless

35. Power is a:

(A) Scalar quantity

(B) Vector quantity

(D) Dimensionless

36. Energy expenditure during exercise is measured in:

(A) Kilocalories (kcal)

(B) Newtons (N)

(D) Liters

37. Which movement involves maximum positive work?

(A) Jumping upward

(B) Sitting quietly

(D) Walking downhill

38. Which movement involves maximum negative work?

(A) Landing from a jump

(B) Standing still

(D) Weightlifting upward

39. Energy transfer in plyometric training is due to:

(A) Stretch-shortening cycle

(B) Static contraction

(D) Chemical storage only

40. Mechanical work output in rowing involves:

(A) Force applied to oars over distance

(B) Heat production

(D) Air resistance only

41. The metabolic equivalent of task (MET) is used to:

(A) Estimate energy cost of activities

(B) Measure strength only

(D) Measure joint torque

42. Efficiency decreases when:

(A) More energy lost as heat

(B) Power increases

(D) Muscles shorten

43. In biomechanics, power is crucial for:

(A) Explosive movements like sprinting and jumping

(B) Flexibility training

(D) Static posture

44. Holding a heavy load in isometric contraction:

(A) No external work, but energy is consumed

(B) Maximum external work

(D) Negative work

45. The first law of thermodynamics states:

(A) Energy cannot be created or destroyed, only transformed

(B) Work equals mass × acceleration

(D) Force is equal to displacement

46. Mechanical advantage reduces:

(A) Force needed to do same work

(B) Work done

(D) Energy required by muscles

47. Work is greater when:

(A) Force and displacement both increase

(B) Displacement decreases

(D) No movement occurs

48. In biomechanics, internal work refers to:

(A) Energy used to move body segments relative to each other

(B) Work against external loads only

(D) Work of heart muscles only

49. External work refers to:

(A) Energy used to move the body against external resistance

(B) Internal energy exchange

(D) Reflex movements

50. Muscle power is determined by:

(A) Force × Velocity of contraction

(B) Mass ÷ Time

(D) Displacement ÷ Energy