Physics 1998 Waec Past Questions and Answers

Question 11 :

• WAEC 1998

The earth is not a perfect sphere because its equatorial axis is longer than the polar axis. where on the earth's surface would an object have its greatest weight?

A. Half way between the equator and the north pole
B. Near the equator
C. Half way between the equator and the south pole
D. At either pole
E. At the equator

Question 12 :

• WAEC 1998

a ball of mass 5.0kg hits a smooth vertical wall normally with a speed of 2m^-1 and rebounds with the same speed. Determine the impulse experienced by the ball

A. 20.0kgm^-1
B. 5.0kgm^-1
C. 1.3kgm^-1
D. 0.0kgm^-1
E. 10.0kgm^-1

Question 13 :

• WAEC 1998

An object is heated from 30^oC to 57^oC. The increases in its temperature on the kelvin scale is

A. 17k
B. 27k
C. 81k
D. 246k
E. 300k

Question 14 :

• WAEC 1998

The lower and upper fixed points of a mecury-in-glass thermometer are marked Y and 180mm respectively. On a particular the mecury meniscus in the thermometer rises to 45mm. If the corresponding reading on a scale is 10^o, calculate the value of Y.

A. 4mm
B. 18mm
C. 30mm
D. 135mm
E. 450mm

Question 15 :

• WAEC 1998

A piece of brass of mass 170kg has its temperature raised from 0^oC to 30^oC. Calculate its increase in volume, given the density of brass at 0^oC as 8.5 x 10³kgm³ and its cubic expansivity as 5.7 x 10^-1k¹

A. 3.4 x 10^-5m³
B. 4.3 x 10^-5m³
C. 3.4 x 10^-5m³
D. 3.4 x 10^-3m³
E. 3.4 x 10^-2m³