1. Air resistance is also known as:
(A) Drag force
(B) Lift force
(C) Gravitational force
(D) Centripetal force
2. Water resistance is a type of:
(A) Static friction
(B) Fluid friction
(C) Rolling friction
(D) Elastic force
3. The direction of air resistance is always:
(A) Same as motion
(B) Opposite to motion
(C) Perpendicular to motion
(D) Random
4. Which factor increases air resistance on a moving object?
(A) Smooth surface
(B) Streamlined shape
(C) Larger surface area
(D) Smaller velocity
5. Water resistance is greater than air resistance because:
(A) Water is denser than air
(B) Water is lighter than air
(C) Water has less molecules
(D) Gravity acts more in water
6. Which sport depends heavily on minimizing water resistance?
(A) Swimming
(B) Cycling
(C) Running
(D) Gymnastics
7. Streamlining reduces:
(A) Gravitational pull
(B) Air and water resistance
(C) Momentum
(D) Mass of body
8. Which shape experiences least air resistance?
(A) Flat plate
(B) Cube
(C) Streamlined body
(D) Cylinder
9. A parachute works effectively because of:
(A) Decreasing air resistance
(B) Increasing air resistance
(C) Reducing gravity
(D) Increasing weight
10. The drag force depends directly on:
(A) Velocity²
(B) Mass²
(C) Height²
(D) Pressure²
11. Swimmers wear tight suits mainly to:
(A) Increase buoyancy
(B) Reduce water resistance
(C) Increase friction
(D) Increase heat loss
12. Air resistance becomes noticeable when:
(A) Speed is high
(B) Surface area is small
(C) Weight is large
(D) Gravity is weak
13. Water resistance acts in which direction relative to swimmer’s motion?
(A) Forward
(B) Opposite
(C) Upward
(D) Downward
14. In biomechanics, drag is classified as:
(A) External force
(B) Internal force
(C) Gravitational force
(D) Magnetic force
15. A streamlined fish reduces water resistance by:
(A) Rough skin
(B) Smooth, tapered body
(C) Increasing drag
(D) Expanding gills
16. Cyclists wear aerodynamic helmets to:
(A) Reduce weight
(B) Reduce air resistance
(C) Increase air pressure
(D) Increase rolling friction
17. Air resistance has the greatest impact on objects that are:
(A) Heavy and compact
(B) Light and large surface area
(C) Dense and small
(D) Circular and metallic
18. The fluid friction force is proportional to:
(A) Surface area exposed
(B) Speed of motion
(C) Density of fluid
(D) All of the above
19. In running, loose clothing:
(A) Increases air resistance
(B) Decreases air resistance
(C) Has no effect
(D) Increases buoyancy
20. Which property of water increases water resistance?
(A) Density
(B) Elasticity
(C) Magnetism
(D) Transparency
21. The drag force on a moving swimmer increases with:
(A) Speed of swimming
(B) Smoothness of water
(C) Reduction in body size
(D) None of the above
22. Which law explains resistance to motion in fluids?
(A) Newton’s First Law
(B) Archimedes’ Principle
(C) Bernoulli’s Principle
(D) Fluid dynamics laws
23. Skydivers spread their arms and legs to:
(A) Reduce air resistance
(B) Increase air resistance
(C) Increase gravitational pull
(D) Decrease drag
24. The resistance experienced by submarines is:
(A) Air resistance
(B) Water resistance
(C) Rolling friction
(D) Tension
25. At terminal velocity, air resistance is equal to:
(A) Weight of object
(B) Mass × acceleration
(C) Buoyant force
(D) Centripetal force
26. Why do sprinters wear tight clothing?
(A) Reduce rolling resistance
(B) Reduce air resistance
(C) Increase acceleration
(D) Increase muscular force
27. Which factor does NOT affect water resistance?
(A) Shape
(B) Density of water
(C) Speed of object
(D) Gravitational pull of Earth
28. In swimming, drag is reduced by:
(A) Streamlined body position
(B) Wide arm strokes
(C) Loose swimwear
(D) High resistance fins
29. Which type of friction is responsible for slowing down airplanes?
(A) Rolling friction
(B) Sliding friction
(C) Air resistance
(D) Surface tension
30. The SI unit of drag force is:
(A) Joule
(B) Pascal
(C) Newton
(D) Watt
31. Divers keep their bodies straight when entering water to:
(A) Increase buoyancy
(B) Reduce water resistance
(C) Increase splash
(D) Reduce gravity
32. Which fluid causes more resistance?
(A) Air
(B) Water
(C) Both equal
(D) Vacuum
33. Athletes use wax or oil on surfboards to:
(A) Increase water resistance
(B) Reduce water resistance
(C) Increase gravity
(D) Increase drag
34. Which factor increases drag force in air?
(A) Streamlined design
(B) Larger frontal area
(C) Smooth surfaces
(D) Lower velocity
35. Which natural phenomenon balances air resistance with gravity?
(A) Terminal velocity
(B) Free fall
(C) Projectile motion
(D) Acceleration
36. Water resistance is lowest in which swimming stroke?
(A) Butterfly
(B) Breaststroke
(C) Freestyle
(D) Backstroke
37. The density of fluid affects:
(A) Gravitational pull
(B) Resistance to motion
(C) Magnetic field
(D) Elasticity of body
38. Parachutes increase:
(A) Gravitational pull
(B) Air resistance
(C) Lift force
(D) Rolling resistance
39. What effect does shaving body hair have for swimmers?
(A) Increases drag
(B) Reduces drag
(C) No effect
(D) Increases buoyancy
40. Birds have streamlined bodies mainly to:
(A) Reduce weight
(B) Reduce air resistance
(C) Increase surface area
(D) Increase lift
41. Fluid friction is more significant at:
(A) Low speeds
(B) High speeds
(C) Zero motion
(D) Constant rest
42. Water resistance in rowing is overcome by:
(A) Buoyant force
(B) Muscle power applied through oars
(C) Gravity
(D) Air resistance
43. In biomechanics, resistance forces are important for:
(A) Posture only
(B) Movement efficiency
(C) Energy loss only
(D) Balance only
44. Tight-fitting cycling suits are designed to:
(A) Increase heat loss
(B) Reduce air resistance
(C) Increase rolling resistance
(D) Increase body weight
45. Which aquatic animal shows adaptation to reduce drag?
(A) Dolphin
(B) Crab
(C) Octopus
(D) Jellyfish
46. The resistance of a fluid to motion is called:
(A) Viscosity
(B) Density
(C) Elasticity
(D) Pressure
47. Which is greater: drag in air or drag in water?
(A) Air
(B) Water
(C) Equal
(D) Depends only on gravity
48. Which factor increases air resistance on runners?
(A) Larger body mass
(B) Tighter clothing
(C) Spread arms
(D) Streamlined posture
49. The fluid resistance is directly related to:
(A) Cross-sectional area
(B) Fluid density
(C) Velocity²
(D) All of the above
50. In biomechanics, overcoming air and water resistance is crucial for:
(A) Sports performance
(B) Rehabilitation exercises
(C) Energy efficiency
(D) All of the above