Physics 1990 Waec Past Questions and Answers

Question 6 :

• WAEC 1990

A plane inclined at an angle at 30^o to the horizontal has an efficiency of 50%. The force parallel to the plane required to push a load of 120 N uniformly up the plane is

A. 40√3N
B. 60N
C. 120N
D. 200N
E. 240N

Question 7 :

• WAEC 1990

The diagram above represents a portion of a micrometer screw 20 gauge. What is its reading?

A. 3.70mm
B. 3.67mm
C. 3.50mm
D. 3.33mm
E. 3.17mm

Question 8 :

• WAEC 1990

A girl whose mass is 55kg stands on a spring - weighing machine inside a lift. When the lift starts to ascend, its acceleration is 2ms1. What will be the reading on the machine? (Take g = ms^-2)

A. 66 kg
B. 55 kg
C. 44 kg
D. 22 kg
E. 11 kg

Question 9 :

• WAEC 1990

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

Question 10 :

• WAEC 1990

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. F^cosθ/_x
C. Fx tanθ
D. Fx sinθ
E. Fx cosθ