WAEC Physics questions: Scalars and vectors

11 questions with answers and explanations. Tap an option to check yourself.

1. Question 1· Scalars and vectors· WAEC

   Which pair consists of a scalar and a vector respectively?

   • Aforce and momentum
   • Bdisplacement and velocity
   • Cmass and time
   • Dspeed and acceleration

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   Explanation and discussion

2. Question 2· Scalars and vectors· WAEC

   Which of these quantities has both size and direction?

   • Atime
   • Bmass
   • Cweight
   • Dwork

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   Explanation and discussion

3. Question 3· Scalars and vectors· WAEC

   A force of 20 N acts at 60° to the horizontal. What is its horizontal component?

   • A17.3 N
   • B10 N
   • C20 N
   • D11.5 N

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   Explanation and discussion

4. Question 4· Scalars and vectors· WAEC

   Forces of 6 N and 8 N act on a body at right angles to each other. Find their resultant.

   • A14 N
   • B10 N
   • C2 N
   • D48 N

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   Explanation and discussion

5. Question 5· Scalars and vectors· WAEC

   A boat heads north at 4 m/s across a river flowing east at 3 m/s. Its resultant speed is

   • A5 m/s
   • B7 m/s
   • C1 m/s
   • D12 m/s

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   Explanation and discussion

6. Question 6· Scalars and vectors· WAEC

   Which of the following pairs consists only of scalar quantities?

   • AMass and energy
   • BForce and speed
   • CVelocity and time
   • DWeight and length

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   Explanation and discussion

7. Question 7· Scalars and vectors· WAEC

   Which of these quantities is a vector?

   • Amass
   • Bspeed
   • Cdisplacement
   • Denergy

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   Explanation and discussion

8. Question 8· Scalars and vectors· WAEC

   A force of 50 N acts at 60° to the horizontal. Find its vertical component.

   • A25 N
   • B43.3 N
   • C50 N
   • D86.6 N

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   Explanation and discussion

9. Question 9· Scalars and vectors· WAEC

   Two forces of 3 N and 4 N act at right angles on a body. The magnitude of their resultant is

   • A7 N
   • B1 N
   • C12 N
   • D5 N

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   Explanation and discussion

10. Question 10· Scalars and vectors· WAEC

    Two forces of 6 N and 8 N act at right angles. The magnitude of their resultant is

    • A2 N
    • B14 N
    • C10 N
    • D48 N

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    Explanation and discussion

11. Question 11· Scalars and vectors· WAEC

    Forces of 7 N and 3 N act on a body in the same direction. Find their resultant.

    • A7.6 N
    • B4 N
    • C21 N
    • D10 N

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    Explanation and discussion