When a solid substance disappears completely as a gas on heating, the substance is said to have undergone?

• A. Sublimation
• B. Crystallization
• C. Distillation
• D. Evaporation

The roots of the equation \(2x^{2} + kx + 5 = 0\) are \(\alpha\) and \(\beta\), where k is a constant. If \(\alpha^{2} + \beta^{2} = -1\), find the values of k.

• A. \(\pm 16\)
• B. \(\pm 8\)
• C. \(\pm 4\)
• D. \(\pm 2\)

What are the positive and negative effects of inflation on the economy?

The table below shows the number of eggs laid by the chickens in a man's farm in a year.

(a) Draw a cumulative frequency curve for the distribution.

(b) Use your graph to find the interquartile range.

(c) If a woman buys a chicken from the farm, what is the probability that the chicken lays at least 60 eggs in a year?

When elasticity is zero, the demand curve is_____________

• A. circular
• B. downward sloping
• C. perfectly inelastic
• D. concave

When air is successively passed through sodium hydroxide solution, alkaline pyrogallol and then concentrated tetraoxosulphate (VI) acid, its remaining components are

• A. oxygen and water vapour
• B. oxygen and nitrogen
• C. carbon (IV) acid and noble gases
• D. nitrogen and noble gases

The Mid-Western Region was created in Nigeria in

• A. 1961
• B. 1962
• C. 1963
• D. 1964

Good treatment of neighbours and guest is discussed in Hadith

• A. 14th of an Nawawi
• B. 15th of an Nawawi
• C. 16th of an Nawawi
• D. 17th of an Nawawi

In 1947, Dr. Nnamdi Azikiwe led a delegation to the British Colonial Office in London to protest against the

• A. provisions of the Richards Constitution
• B. appointment of Bernard Bourdillon as Governor - General
• C. appointment of Oliver Lyttelton as colonial secretary
• D. provision of the Macpherson Constitution

Which of the following is the correct order for land preparation?

• A. land clearing-ploughing-harrowing-ridging
• B. land-clearing-harrowing-ploughing-ridging
• C. land-clearing-ploughing-ridging-harrowing
• D. land-clearing-harrowing-ridging-ploughing