Physics 1991 Waec Past Questions and Answers

Question 21 :

• WAEC 1991

The saturation vapour of a liquid depends on its

A. Volume
B. Temperature
C. Mass
D. Density
E. Pressure

Question 22 :

• WAEC 1991

Two forces, whose resultant is 100N are perpendicular to each other. If one of them makes an angle of 60^o with the resultant, calculate the magnitude. (Sin 60^o = 0.8660, Cos 60^o = 0.500)

A. 200.0N
B. 173.2N
C. 115.5N
D. 86.6N
E. 50.0N

Question 23 :

• WAEC 1991

The graph above shows the expansion of water as the temperature increases from 0^oC. Which of the following deductions from the graph are true? i. Water has its maximum density at Q. ii. The volume of water is greater at 0^oC than at 4^oC. iii. The volume of water decreases uniformly when cooled from 100^oC. iv. When water solidifies, its volume increases

A. I and ii only
B. I and iii only
C. Ii and iii only
D. I, ii and iii only
E. I, ii and iv only

Question 24 :

• WAEC 1991

Two mirrors are inclined as shown in the diagram. A ray of light RO strikes the arrangement at O and emerges along PO. The emergent ray has been deviated through

A. 240^o
B. 180^o
C. 120^o
D. 60^o
E. 30^o

Question 25 :

• WAEC 1991

In the arrangement illustrated above, Y and B are yellow and blue transparent light filters respectively through the filters is

A. Blue
B. Red
C. Yellow
D. Green
E. Black