JAMB Physics questions: Scalars and vectors

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

1. Question 1· Scalars and vectors· JAMB

   Forces of 5 N due east and 12 N due north act on a body. Find the magnitude of their resultant.

   • A7 N
   • B17 N
   • C13 N
   • D60 N

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2. Question 2· Scalars and vectors· JAMB

   A ball is thrown at 20 m/s at 30° above the horizontal. Find the vertical component of its velocity.

   • A20 m/s
   • B17.3 m/s
   • C10 m/s
   • D5 m/s

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3. Question 3· 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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4. Question 4· 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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5. Question 5· 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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6. Question 6· 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

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7. Question 7· 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

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8. Question 8· Scalars and vectors· JAMB

   Which of the following is a scalar quantity?

   • Amass
   • Bweight
   • Cmomentum
   • Dacceleration

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9. Question 9· 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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10. Question 10· 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

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11. Question 11· 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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12. Question 12· 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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13. Question 13· 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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    Explanation and discussion