About this Quiz

This Law of Mass Action Class 8 MCQ test contains random 30 Objective Questions. You have select one correct answer among given options.

Law of Mass Action Class 8 MCQ With Answers

1. Which of these is not a chemical reaction?

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

2. When an unbalanced force acts on an object, the force ______________________.

  • changes the motion of the object
  • does not change the motion of an object
  • is cancelled by another force
  • is equal to the weight of the object

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

  • 8N
  • 1.6N
  • 0.6N
  • 15N

4. In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?

  • 4g
  • 5g
  • 9g
  • 14g

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

  • False
  • True

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

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

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

  • decreases
  • stays the same
  • also increases
  • stops

8. Which of the following would be an example of Newton's Third Law of Motion ?

  • Sleeping
  • Playing tag
  • Running
  • Tug of war

9. This is a rate of change through time.

  • Velocity
  • Force
  • Acceleration
  • Mass

10. Which law best explain how boats work ?

  • Third law
  • Gravitational pull
  • Second law
  • First law

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

  • 50N
  • 5N
  • 12.5N
  • 100N

12. A person not paying attention while skateboarding hits a rock. The skatboard stops... the don't

  • Law of acceleration
  • Law of inertia
  • Law of momentum
  • Gravitational force

13. When all the forces on an object are equal or opposite, and the net force is zero, that's .....

  • balanced force
  • terminal velocity
  • unbalanced forces
  • reaction forces

14. What types of systems are there?

  • Mechanical and Electrical Systems
  • Inside and Outside Systems
  • Open and Closed Systems
  • Human and Machine Systems

15. Newton's law of motion describes the relationship of force, mass, and acceleration. Write the equation.

  • M=F/A
  • F=MA
  • A= F/M
  • All of the above

16. 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

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

  • decreases
  • stays the same
  • also increases
  • stops

18. Look at this scenario, which law does this represent?

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

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

  • decreases
  • stays the same
  • also increases
  • stops

20. 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

21. 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

22. This type of system allows matter to flow freely in and out...

  • Closed System
  • Open System

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

  • True
  • False

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

  • False
  • True

25. Matter can not be created nor destroyed: it can only be

  • Destroyed a little bit
  • Invisible
  • Transformed, changed
  • None of the above

26. This is any action that will cause an object to change its speed.

  • Force
  • Velocity
  • Mass
  • Gravity

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

  • Subscript
  • Superscript
  • Coefficient
  • Charge

28. Why do rocks fall from a cliff?

  • Gravity
  • Velocity
  • Acceleration
  • Inertia

29. When an unbalanced force acts on an object, the force ______________________.

  • changes the motion of the object
  • does not change the motion of an object
  • is cancelled by another force
  • is equal to the weight of the object

30. Why do rocks fall from a cliff?

  • Gravity
  • Velocity
  • Acceleration
  • Inertia

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