Waec Physics 1989 Past Questions and Answers

Question 6:

• WAEC 1989

A block of material of volume 20cm^-3 and density 2.5gcm^-3 is suspended from a spring balance with half the volume immersed in water. What is the reading of the spring balance? (Density of water = 1.0gcm^-3).

A. 8g
B. 25g
C. 30g
D. 40g
E. 50g

Question 7:

• WAEC 1989

A piece of cork floating on water is acted upon by the forces of...

A. Weight and viscosity
B. Weight and upthrust
C. Upthrust and viscosity
D. Weight only
E. Upthrust only

Question 8:

• WAEC 1989

A stone tied to a string is made to revolve in a horizontal circle of radius 4m with an angular speed of 2 rad per sec. With what tangential velocity will the stone move off the circle if the string is cut?

A. 16.0 ms^-1
B. 8.0 ms^-1
C. 6.0 ms^-1
D. 2.0 ms^-1
E. 0.5 ms^-1

Question 9:

• WAEC 1989

The motion of the prongs of the sounding tuning fork is

A. Random
B. Translational
C. Rotational
D. Vibratory
E. Vibratory and rotational

Question 10:

• WAEC 1989

Which of the following is a derived unit?

A. Metre
B. Coulomb
C. Kilogram
D. Second
E. Ampere