Quiz  /  Law of Mass Action Class 8 MCQ Questions With Answers

  • 1. 
    Which are the reactants in the following reaction?2Mg + O2 ---> 2MgO

  • Mg and O
  • MgO
  • Mg and MgO
  • O and MgO

  • 2. 
    Measure of the amount of matter

  • mass
  • volume
  • weight
  • density

  • 3. 
    A chemical reaction is balanced when

  • both sides have the same elements
  • Both sides have the same  number of atoms
  • Same subscripts
  • Same coefficients

  • 4. 
    Which of these is not a chemical reaction?

  • Burning of wood
  • Milk going bad
  • Mixing vinegar and baking soda
  • Melting of ice

  • 5. 
    Since gasses weigh nothing, when they are produced in a reaction they do not have to be accounted for.

  • True
  • False

  • 6. 
    In a synthesis reaction

  • A compound breaks apart into two or more compounds
  • Two or more compounds make one single product
  • CO2 and H2O must be products
  • O2 must be a reactant

  • 7. 
    The number to the lower side of an element is a

  • Subscript
  • Superscript
  • Coefficient
  • Charge

  • 8. 
    Any push or pull of an object

  • Mass
  • Force
  • Velocity
  • Momentum

  • 9. 
    An 18-wheeler requires more time and distance to stop than a Mini-Cooper.

  • Law  of Inertia
  • Law of Force and Acceleration
  • Law  of Action-Reaction

  • 10. 
    How many atoms do you have in the compound 2MgCl2?

  • 2 atoms
  • 4 atoms
  • 6 atoms
  • 8 atoms

  • 11. 
    Which law ? for every action, there's an equal and opposite reaction.

  • Newton's 1st law
  • Newton's 3rd law
  • Newton's 2nd law
  • Newton's 4th law

  • 12. 
    If you increase the force on an object, its acceleration?

  • decreases
  • stays the same
  • also increases
  • stops

  • 13. 
    If you increase the mass on an object, its acceleration

  • decreases
  • stays the same
  • also increases
  • stops

  • 14. 
    A person walks out of a store with a pillow at the top of an overflowing shopping cart. While walking to the car, the cart’s wheel hits a large rock, causing the cart to suddenly stop. The pillow slides forward.

  • Law of Inertia
  • Law of Force and Acceleration
  • Law of Action-Reaction

  • 15. 
    How much force is needed to accelerate a 25kg bowling ball at 2m/s2.

  • 50N
  • 5N
  • 12.5N
  • 100N

  • 16. 
    In a car accident, a passenger not wearing a seat belt may crash through a windshield because of his or her inertia.

  • False
  • True

  • 17. 
    A squid pushes water back with its tentacles to allow it to swim forward.

  • Law of Inertia
  • Law of Force and Acceleration
  • Law of Action-Reaction

  • 18. 
    How much force is needed to accelerate a 3kg skateboard at 5m/s2.

  • 8N
  • 1.6N
  • 0.6N
  • 15N

  • 19. 
    This person bought coffee and put it on the seat next to them. If they stopped quickly and the coffee spilled which law would that represent?

  • Newton's 1st Law
  • Newton's 3rd Law
  • Newton's 2nd Law
  • Newton's 3rd law

  • 20. 
    The tendency of an object to resist changes in it's motion is _________.

  • inertia
  • acceleration
  • force
  • velocity

  • 21. 
    An object will remain at rest unless a balanced force acts upon it.

  • False
  • True

  • 22. 
    Does the equation H2+O2 →H2O follow the Law of Conservation of Mass?

  • Yes, because the atoms are equal.
  • No, because more info is needed.
  • No, because there are more atoms in the product.
  • No, because there are more atoms in the reactant.

  • 23. 
    For an object to remain at rest, which of the following must be true?

  • The forces on it are balanced
  • There is no friction
  • Gravity does not act on it
  • The object has no mass

  • 24. 
    When sodium and chlorine combine to form sodium chloride, sodium chloride is the:

  • Originator
  • Reactant
  • Product
  • Produce

  • 25. 
    If a 2kg bird is pushed by the wind with a force of 2N, how fast does the bird accelerate?

  • 1 m
  • 2 m/s2
  • 4m/s2
  • 1 m/s2

  • 26. 
    Maria fills a bowl with 200 g of water. She puts the bowl of water in the freezer, and the water freezes. Which will most likely be the mass of the frozen water?

  • 50 g
  • 100 g
  • 200 g
  • 400 g

  • 27. 
    What are Newton's 3 Laws?

  • Law of Action-Reaction, Law of Inertia and Law of Velocity
  • Law of Speed, Law of Action-Reaction, Law of Force and Acceleration
  • Law of Inertia, Law of Force and Acceleration, and Law of Action-Reaction
  • Law of Mass and Acceleration, Law of Action-Reaction, and Law of Inertia

  • 28. 
    Look at this scenario, which law does this represent?

  • Law of Inertia
  • Law of Force and Acceleration
  • Law of Action-Reaction
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