Physics 1998 Waec Past Questions and Answers

Question 6 :

• WAEC 1998

As the end Q of the plank is raised, the component of W, normal to plank, will

A. Increase
B. Decrease
C. Remain the same
D. Be slightly greater than W
E. Be independent of w

Question 7 :

• WAEC 1998

If \(\theta\) is equal to \(\alpha\) at the time the box is just about to slide down the plank, the coefficient of static friction between the plank and box is

A. Sin\(\alpha\)
B. Cos\(\alpha\)
C. Tan\(\alpha\)
D. Sec\(\alpha\)
E. Cot\(\alpha\)

Question 8 :

• WAEC 1998

I the box is pulled from P to Q, which of the following expresses the velocity ratio of the inclined plane?

A. PR/PQ
B. OR/PQ
C. OR/PR
D. PQ/PR
E. PQ/QR

Question 9 :

• WAEC 1998

a pilot records the atmospheric pressure outside his plane as 63cm of Hg while a ground observer records a reading of 75cm of Hg with his barometer. Assuming that the density of air is constant, calculate the height of the plane above the ground. (take the relative densities of air and mecury as 0.00136 and 13.6 respectively)

A. 120m
B. 138m
C. 274m
D. 1200m
E. 120,000m

Question 10 :

• WAEC 1998

An object is protected with a velocity of 100m^-1 at an angle of 60^o to the vertical. Calculate the time taken by the object to reach the highest point (Take g as 10ms^-2

A. 5.0s
B. 8.7s
C. 10.0s
D. 17.3s
E. 20.0s