Waec Physics Past Questions For Year 1990
Question 6
A particle of mass 2.5 x 10-6kg revolving around the earth has a radial acceleration of 4 X 107 ms-2. What is the centripetal force of the particles?
- A. 6.25 x 10-14N
- B. 1.60 x10-13N
- C. 5.00 x 10N
- D. 1.00x102N
- E. 2.00x1O2N
Question 7
A simple pendulum makes 50 oscillations in one minute. What is its period of oscillation?
- A. 0.02s
- B. 0.20s
- C. 0.83s
- D. 1.20s
- E. 50.00s
Question 8
An object R leaves a platform XY with a horizontal velocity of 7m-1 and lands at Q. lf it takes the same object 0.3s to fall freely from Y to P, calculate the distance PQ.(Take g = 1Oms2)
- A. 7.30m
- B. 2.55m
- C. 2.10m
- D. 1.65m
- E. 0.45m.
Question 9
A force F is applied to a body P as shown in the diagram above. If the body P moves through a distance r, which of the following represents the work done?
- A. Fx
- B. Fcosθ/x
- C. Fx tanθ
- D. Fx sinθ
- E. Fx cosθ
Question 10
Two forces each of 4 N act on the opposite sides of a rectangular plate as shown in the diagram above. Calculate the magnitude of g the couple acting on the plate.
- A. 6.4 Nm
- B. 3.2 Nm
- C. 1.6 Nm
- D. 0.8 Nm
- E. 0.0 Nm
