Past Questions And Answers
A radioactive substance has a half-life of 20 hours. What fraction of the original radioactive nuclei will remain after 80 hours?
- A. 1/32
- B. 1/16
- C. 1/8
- D. 1/4
(a) If L is the Avogadro constant and E° is standard cell potential, state what X and Y stand for in the following expressions
(i) X = \(\frac{\text{Mass of L molecules of gas or vapour}}{\text{ Mass of L molecules of hydrogen}}\)
(ii) Y = -nFE°
(b) State two differences between a primary cell and a secondary cell.
View Discussion (0)WAEC 1993 THEORYTo compare the standard of living among nations, the most widely used economic indicator is the
- A. real gross national income
- B. real domestic output
- C. real per capita income
- D. per capita nominal income
Amos in his prophetic work advocated for ______?
- A. sincere sacrifice and worship
- B. true religion and social justice
- C. love and true sacrifice
- D. righteousness, peace and love
Which of these ecosystem has the lowest primary productivity per square meter?
- A) Salt marsh
- B) An open ocean
- C) A coral reef
- D) A grassland
What is the atomic number of aluminium?
- A. 13
- B. 26
- C. 14
- D. 12
Arrange the following in descending order 2/3, 4/7, 5/9 and 1/4
- (a) 2/3, 4/7, 5/9 and 1/4
- (b) 1/4, 5/9, 4/7 and 2/3
- ( c) 1/4, 4/7, 5/9 and 2/3
- (d) 1/4, 2/3, 4/7 and 5/9
The bar chart shows the marks distribution in am English test. If 50% is the pass mark, how many students passed the test?
- A. 100
- B. 85
- C. 80
- D. 70
Under the Civil Service Reforms of 1988, the Nigerian civil service became
- A. nationalized
- B. professionalized
- C. bureaucratized
- D. indigenized
What happens to the conductivity of an electrolyte as its concentration reduces?
- A) increases
- B) decreases
- C) is unaffected
- D) becomes resistivity