Physics 2018 Waec Past Questions and Answers

Question 6 :

• WAEC 2018

During a training session, two footballers pass a ball repeatedly between each other. The 'to and fro' motion of the ball is not simple harmonic because the
I. Acceleration of the ball is not directed towards a fixed point
II. Restoring force is not directed towards the centre
III. Acceleration of the ball is not directly proportional to the displacement from a fixed point
Which of the statements above are correct?

A. I and III only
B. I and II only
C. II and III only
D. I, II and III

Question 7 :

• WAEC 2018

A dam is able to hold a large quantity of water because its wall is

A. Thickest at the top
B. Thickest at the middle
C. Thickest at the bottom
D. Of the same thickness throughout

Question 8 :

• WAEC 2018

A body of mass m moving around a circle of radius r with a uniform speed v experiences a centripetal force F. The work done by the centripetal force on it is

A. Fv
B. Zero
C. Fmr
D. \(\frac{Fr}{m}\)

Question 9 :

• WAEC 2018

A block is acted upon by TWO horizontal forces as illustrated in the diagram above. The block accelerates at 1.5\(ms^{-2}\). Calculate the mass of the block.

A. 6kg
B. 9kg
C. 10kg
D. 15kg

Question 10 :

• WAEC 2018

Which of the following quantities are dimensionally independent?
I. Dielectric constant II. Momentum III. Efficiency IV. Refractive index

A. I and II
B. II, III and IV
C. I, II, III and IV
D. I, III and IV