Waec Physics 1992 Past Questions and Answers

Question 11:

• WAEC 1992

A barometer can be used in determining the I. height of a mountain II. depth of a mine III. dew point. Which of the following is/are correct?

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

Question 12:

• WAEC 1992

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 gas 10ms²)

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

Question 13:

• 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

Question 14:

• WAEC 1992

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

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

Question 15:

• WAEC 1992

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.

A. 71^oC
B. 40^oC
C. 131^oC
D. 313^oC
E. 404^oC