Past Questions And Answers
All these are fruit except____
- (a)Beans
- (b) Banana
- (c) Cashew
- (d) Garden egg
Prophet Amos told Israel to hate evil, love good and establish justice in the gate so that God would
- A. heal their diseases
- B. give them good leaders
- C. be gracious to them
- D. multiply their descendants
(a) (i) Define nuclear fission.
(ii) A certain natural decay series starts with \(^{238}_{92}U\) and ends with\(^{230}_{90}Th\). Each step involves the loss of an alpha or a beta particle. Using the given information, deduce how many alpha beta particpes were emitted.
(b) Consider the equilibrium reaction represented by the following equation:
A\(_{2(9)}\) + 3B\(_{2(9)}\) \(\rightleftharpoons\) 2AB\(_{3(g)}\); \(\Delta\)H = + xkJmol\(^{-1}\)
Explain briefly the effect of each of the following changes on the equilibrium composition: (i) increase in concentrat of B; (ii) decrease in pressure of the system; (iii) addition of catalyst.
(c) The lattice energies of three sodium halides are as follows:
Compound | NaF | NaBr | Nal |
Lattice energy/kJmol\(^{-1}\) | 890 | 719 | 670 |
Explain briefly the trend.
(d) State the property exhibited by nitrogen (IV) oxide in each of the following reactions:
(i) 4Cu + 2NO\(_2\) \(\to\) 4CuO + N\(_2\);
(ii) H\(_2\)O + 2NO\(_2\) \(\to\) HNO\(_3\) + HNO\(_2\).
(e) Iron is manufacturcd in a blast furnace using iron ore (Fe\(_2\)O\(_3\)), coke and limestone. Write the equation for the reaction(s) at the: (i) top of the furnace; (ii) middle of the furnace; (iii) bottom of the furnace.
(f) (i) Name two products of destructive distillation of coal. (ii) Give one use of each product in (f)(i).
View Discussion (0)WAEC 2012 THEORYFrom the words lettered A to D, choose the word that best completes each of the following sentences.
There is a need to raise teachers' salary in order to boost their_____
- A. spirit
- B. moral
- C. soul
- D. morale
A stone, Q is thrown with velocity U at an angle of 75o to the horizontal. Another stone R is thrown with the same velocity U but with an angle of 15o to the horizontal. The ranges covered by the stones will be
- A. greater for Q
- B. greater for R
- C. the same for Q and R
- D. greater for the heavier of the two stones
The market supply curve slopes upward from left to right indicating that?
- A. producers pay high taxes
- B. two commodities can be supplied at the same time
- C. at a lower price, less is supplied
- D. at a lower price, more is supplied and demanded
Peter taught that the Gospel was preached to the dead that they might
- A. fight Satan
- B. repent and be cleansed of sins
- C. receive power to overcome temptation
- D. live in the Spirit like God
The table below shows the scale of preference of a student - Mr Smith whose disposable income is $7.00. Use the information in the table to answer the auestoins that follow.
| Items needed | Price ($) |
| Textbook | 5.00 |
| Shirt | 2.00 |
| Shoes | 3.00 |
| Trousers | 3.00 |
| Notebook | 1.00 |
| School fees | 7.00 |
| Mattress | 10.00 |
(a)(i) What will Mr. Smith spend his money on?
(ii) Explain your answer in 2(a)(i).
(b)(i) What is the opportunity cost of Mr. Smith's decision in 2(b)(i)?
(ii) Explain your answer in 2(b)(i).
(c)(i) If Mr. Smith's disposable income increases to $10.0, what will he spend it on?
(ii) What is the opportunity cost of the decision in 2(c)(i)?
(d) Define "scale of preference" and "opportunity cost".
(e) What is the importance of a scale of preference?
View Discussion (0)WAEC 2013 THEORYIdentify the word that has the stress on the first syllable.
- A. dismiss
- B. comment
- C. intact
- D. confuse
(a) (i) What is culling? (ii) Give three reasons why culling is practised in livestock management. (b) State three advantages and three disadvantages of each of the following management systems in poultry production: (i) deep litter system; (ii) battery cage system.
View Discussion (0)WAEC 2002 THEORY