JAMB and WAEC Physics questions

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

1. Question 641· Scalars and vectors· JAMB

   Which pair consists of vector quantities only?

   • Avelocity and acceleration
   • Bmass and weight
   • Cspeed and time
   • Denergy and momentum

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   Answer: A. velocity and acceleration

   Explanation and discussion

2. Question 642· Scalars and vectors· JAMB

   Two forces of 3 N and 4 N act on a body. Which of the following CANNOT be their resultant?

   • A7 N
   • B5 N
   • C1 N
   • D8 N

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   Answer: D. 8 N

   Explanation and discussion

3. Question 643· 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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   Answer: B. 10 N

   Explanation and discussion

4. Question 644· 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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   Answer: A. 5 m/s

   Explanation and discussion

5. Question 645· Scalars and vectors· JAMB

   Two forces, each of 7 N, act at a point with an angle of 120° between them. Find the magnitude of their resultant.

   • A14 N
   • B7 N
   • C0 N
   • D12.1 N

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   Answer: B. 7 N

   Explanation and discussion

6. Question 646· Scalars and vectors· JAMB

   A boat is steered straight across a river at 4 m/s while the current flows at 3 m/s. Find the resultant speed of the boat.

   • A1 m/s
   • B7 m/s
   • C5 m/s
   • D12 m/s

   Show answer

   Answer: C. 5 m/s

   Explanation and discussion

7. Question 647· Scalars and vectors· JAMB

   Two forces of 6 N and 8 N act at right angles at a point. Their resultant is:

   • A10 N
   • B2 N
   • C14 N
   • D48 N

   Show answer

   Answer: A. 10 N

   Explanation and discussion

8. Question 648· Scalars and vectors· JAMB

   Which of the following is a scalar quantity?

   • Amass
   • Bweight
   • Cmomentum
   • Dacceleration

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   Answer: A. mass

   Explanation and discussion

9. Question 649· Scalars and vectors· JAMB

   Forces of 5 N and 12 N act on a body. Which of these cannot be their resultant?

   • A17 N
   • B7 N
   • C13 N
   • D18 N

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   Answer: D. 18 N

   Explanation and discussion

10. Question 650· 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

    Show answer

    Answer: A. Mass and energy

    Explanation and discussion

11. Question 651· Scalars and vectors· JAMB

    A boat heads straight across a river at 4 m/s while the current flows at 3 m/s. Find its resultant speed.

    • A7 m/s
    • B5 m/s
    • C1 m/s
    • D12 m/s

    Show answer

    Answer: B. 5 m/s

    Explanation and discussion

12. Question 652· Scalars and vectors· JAMB

    Two forces of 6 N and 8 N act at right angles on a body. The force that would keep the body in equilibrium is

    • A10 N acting opposite to the resultant
    • B10 N acting along the resultant
    • C14 N
    • D2 N

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    Answer: A. 10 N acting opposite to the resultant

    Explanation and discussion

13. Question 653· Scalars and vectors· WAEC

    Which of these quantities is a vector?

    • Amass
    • Bspeed
    • Cdisplacement
    • Denergy

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    Answer: C. displacement

    Explanation and discussion

14. Question 654· Scalars and vectors· JAMB

    Find the vertical component of a 50 N force inclined at 30° to the horizontal.

    • A25 N
    • B43.3 N
    • C50 N
    • D28.9 N

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    Answer: A. 25 N

    Explanation and discussion

15. Question 655· Scalars and vectors· JAMB

    A force of 10 N acts at 60° to the horizontal. Find its horizontal component.

    • A6 N
    • B8.66 N
    • C10 N
    • D5 N

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    Answer: D. 5 N

    Explanation and discussion

16. Question 656· 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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    Answer: B. 43.3 N

    Explanation and discussion

17. Question 657· 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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    Answer: D. 5 N

    Explanation and discussion

18. Question 658· 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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    Answer: C. 10 N

    Explanation and discussion

19. Question 659· 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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    Answer: D. 10 N

    Explanation and discussion

20. Question 660· Simple a.c. circuits· WAEC

    The reactance of a capacitor decreases when the frequency of the supply

    • Astays the same
    • Bdecreases
    • Cincreases
    • Dbecomes zero

    Show answer

    Answer: C. increases

    Explanation and discussion