Waec Physics Past Questions For Year 1988

Question 6

The motion of a body is simple harmonic if the

waec 1988

• A. Acceleration is always directed towards a fixed point
• B. path of motion is a striaght line
• C. Acceleration is directed towards a fixed point and proportional to its distance from the point
• D. Acceleration is proportional to the square of the distance from a fixed point
• E. Acceleration is constant and directed towards a fixed point

Question 7

Which of the following correctly gives the relationship between linear speed V and angular speed ω of a body moving uniformly in a circle of radius r?

waec 1988

• A. V = ωr
• B. V = ω²r
• C. V = ωr²
• D. V² = ωr
• E. V = ω/r

Question 8

A ball is thrown vertically upwards from the ground with an initial velocity of 50ms^-1. What is the total time spent by the ball in the air? (g = 10ms^-2)

waec 1988

• A. 2.5s
• B. 5.0s
• C. 10.0s
• D. 15.0s
• E. 20.0s

Question 9

A catapult is used to project a stone. Which of the following energy conversions takes place as the stone is released?

waec 1988

• A. The kinetic energy of the stone is converted into gravitational potential energy
• B. The gravitational potential energy of the catapult is converted into kinetic energy of the stone
• C. The gravitational potential energy is converted into elastic potential energy
• D. The elastic potential energy of the catapult is converted into gravitational potential energy of the stone
• E. None of the above

Question 10

A body is projected into space with an initial velocity V₀ at an angle, θ to the horizontal. Which of the following statements is/are correct about its motion?

I. The total time of flight is (V₀ Cosθ)/g.

II. The maximum height is (V₀ Sin 2θ)/2g.

III. The range is (V₀² Cos²θ)/g.

waec 1988

• A. The total time of flight is (V₀ Cosθ)/g.
• B. I & II only
• C. I & III only
• D. II & III only
• E. II only
• F. III only