1ST_QUARTER_MARCIANO_SCI8
  • 1. Which of the following describes a force?
A) a push or pull or both
B) a pull only B.
C) neither a push nor a pull
D) a push only
  • 2. What is the unit of force in metric system?
A) Pouds
B) Newtons
C) Joules
D) Calorie
  • 3. When you move a chair across the floor, what force must your push be stronger than?
A) magnetic
B) friction
C) tension
D) normal
  • 4. A 500-N lady sits on the floor. How much force the floor exerts on her?
A) 500 N
B) 250 N
C) 50 N
D) 1000 N
  • 5. Which force always pulls the objects to the ground?
A) gravitational
B) applied
C) tension
D) friction
  • 6. A leaf falls from a tree. What force(s) are acting on it?
A) Applied force and air resistance
B) Air resistance only
C) Gravitational force only
D) Air resistance and gravitational forces
  • 7. When a cabinet touches the floor, which type of forces exist?
A) Non-contact forces
B) Unbalanced forces
C) Balanced forces
D) Contact forces
  • 8. What refers to how large or strong is the force?
A) magnitude
B) line of action
C) Direction of the force
D) Velocity of the object
  • 9. Which surface would be easiest for a bicycle to move?
A) Concrete road
B) Grass
C) Sand
D) Muddy road
  • 10. Who formulated the Three Laws of Motion?
A) Isaac Newton
B) Aristotle
C) Alexander Graham Bell
D) Thomas Edison
  • 11. Newton’s First Law is also called the Law of:
A) Action and Reaction
B) Acceleration
C) Inertia
D) Gravity
  • 12. An object at rest stays at rest unless acted upon by:
A) A net external force
B) Friction only
C) Its weight
D) Its own inertia
  • 13. Newton’s Second Law relates force, mass, and:
A) Velocity
B) Acceleration
C) Weight
D) Momentum
  • 14. Which equation represents Newton’s Second Law?
A) W = Fd
B) P = W/t
C) F = ma
D) KE = ½ mv²
  • 15. According to Newton’s Third Law, every action has:
A) A stronger push
B) A smaller force
C) An equal and opposite reaction
D) No effect
  • 16. Energy is the capacity to:
A) Exert force
B) Do work
C) Increase inertia
D) Apply mass
  • 17. The two main types of mechanical energy are:
A) Velocity and force
B) Kinetic and potential
C) Heat and light
D) Work and power
  • 18. Formula for kinetic energy:
    )
A) KE = mgh
B) KE = Fd
C) KE = Pt
D) KE = ½ mv²
  • 19. The reaction force when you push on a wall is:
A) The wall does nothing
B) Gravity
C) The wall pushes back with equal force
D) Friction
  • 20. Which of the following has the greatest inertia?
A) A 5-kg dog
B) A 10-kg box
C) A 1-kg rock
D) A feather
  • 21. Which law explains why you move backward when jumping off a boat?
A) First
B) Third
C) Law of gravitation
D) Second
  • 22. Which is NOT an example of Newton’s Third Law?
A) Recoil of a gun
B) A car accelerating
C) Walking
D) Jumping off a skateboard
  • 23. Which energy is due to motion?
A) Chemical
B) Potential
C) Kinetic
D) Nuclear
  • 24. Energy stored in an object due to its position:
A) Kinetic
B) Power
C) Work
D) Potential
  • 25. Which is an example of kinetic energy?
    )
A) Water behind a dam
B) A ball at rest on a table
C) A moving car
D) A stretched bow
  • 26. Which energy transformation occurs in a falling rock?
A) Kinetic → potential
B) Potential → kinetic
C) Work → power
D) Power → potential
  • 27. Which force pulls objects toward the center of the Earth?
A) Tension
B) Gravity
C) Normal force
D) Friction
  • 28. Which force is exerted by a stretched rope or string?
A) Gravitational force
B) Normal force
C) Friction
D) Tension
  • 29. The force that supports an object resting on a surface is called:
A) Normal force
B) Weight
C) Friction
D) Applied force
  • 30. Which force is responsible for making magnets attract or repel?
A) Gravity
B) Magnetic force
C) Friction
D) Applied force
  • 31. Which of the following is NOT a contact force?
A) Friction
B) Tension
C) Gravity
D) Normal force
  • 32. Which force is present when you stretch a rubber band?
A) Normal force
B) Magnetic force
C) Tension force
D) Gravity
  • 33. Which of the following is a contact force?
A) Normal force
B) Magnetic force
C) Electric force
D) Gravity
  • 34. Which force keeps the Earth revolving around the Sun?
A) Friction
B) Tension
C) Normal force
D) Gravity
  • 35. Which force pulls rain droplets down to the ground?
A) Friction
B) Normal force
C) Gravity
D) Magnetic force
  • 36. A 5-kg object accelerates at 2 m/s². What is the net force?
A) 5 N
B) 20 N
C) 10 N
D) 15 N
  • 37. A car moves at 20 m/s with a mass of 1000 kg. Its kinetic energy is:
A) 200,000 J
B) 100,000 J
C) 400,000 J
D) 20,000 J
  • 38. Which wavelength of visible light is the longest?
A) Red
B) Yellow
C) Violet
D) Blue
  • 39. Which EM wave is used for night-vision cameras?
A) Microwave
B) Infrared
C) X-ray
D) Ultraviolet
  • 40. If frequency increases, what happens to wavelength?
A) Doubles
B) Decreases
C) Increases
D) Stays the same
  • 41. Which EM wave allows us to see objects around us?
A) Ultraviolet
B) Infrared
C) Visible light
D) Radio
  • 42. Why do doctors wear protective lead aprons when using X-rays?
A) To reflect visible light
B) To block harmful radiation
C) To reduce heat
D) To block sound
  • 43. Which EM wave is mostly responsible for sunburn?
A) Gamma rays
B) Ultraviolet
C) Microwaves
D) Infrared
  • 44. Which technology uses radio waves to transmit information?
    )
A) Television broadcasts
B) Microwave ovens
C) Ultraviolet lamps
D) MRI scanning
  • 45. Which EM wave is commonly used in remote communication devices like walkie-talkies?
A) Ultraviolet
B) Radio waves
C) Infrared
D) Gamma rays
  • 46. Which design shows the practical use of EM waves for communication?
A) Using radio waves for broadcasting signals
B) Using ultraviolet light for Wi-Fi
C) Using gamma rays in mobile phones
D) Using X-rays for satellite internet
  • 47. If a ball is thrown upward, a classmate says, “The ball has no energy at the top.” Evaluate this statement.
A) Incorrect, because energy disappears in midair
B) Correct, because the ball stops moving
C) Incorrect, because it has potential energy at the top
D) Correct, because gravity cancels all energy
  • 48. A classmate says that heavier objects always fall faster than lighter ones. Which action BEST evaluates this claim scientifically?
A) Shine light on both objects
B) Drop a feather and stone at the same time without air resistance
C) Push both objects on a table
D) Use a balance to measure weight
  • 49. A student claims that "a person sitting on a chair does work." Evaluate the claim.
A) Correct, because force is applied
B) Incorrect, because no displacement occurs
C) Correct, because mass is constant
D) Correct, because energy is used
  • 50. A teacher asks students to design a simple experiment showing Newton’s Third Law. Which setup works best?
A) Measuring speed on a ramp
B) Weighing objects on a scale
C) Dropping a ball and watching it bounce
D) Letting two skaters push off each other
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