Physics 1992 WAEC Past Questions

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A body of mass 5kg falls from a height of 10m above the ground. What is the kinetic energy of the body just before it strikes the ground? (Neglect energy losses and take gravity as 10ms^2)

A. 5J
B. 25J
C. 250J
D. 500J
E. 625J

View Answer & Discuss (4) WAEC 1992

Steel bars, each of length 3.0 m at 28°C, are to be used for constructing a rail line. If the linear expansivity of steel is 1.0 x 10^-5°C, what is the safety gap that must be left between successive bars if the highest temperature expected is 40^oC?

A. 1.2 x 10^-1cm
B. 8.4 x 10^-2cm
C. 7.2 x10^-2cm
D. 3.6 x 10^-2cm
E. 1.8 x 10^-2cm

View Answer & Discuss (4) WAEC 1992

Which of the following statements is/are correct? I. Pure water freezes at 0ºC under normal pressure ll. Water has its highest density at 4ºC. III. The volume is highest at 4ºC,

A. I only
B. II only
C. I and II only
D. I and III only
E. II and III only

View Answer & Discuss (5) WAEC 1992

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A given mass of gas at a temperature of 30°C is trapped in a tube of volume V. Calculate the temperature of the gas when the volume is reduced to two-third of its original value by applying a pressure twice the original value.