Past Questions And Answers
The cloud which is closely associated with thunderstorms is?
- A. cumulonimbus
- B. stratocumulus
- C. cirronimbus
- D. altostratus
What is the term used to describe the maximum number of individuals of a species that an environment can support indefinitely?
- A. Ecological niche
- B. Limiting factor
- C. Carrying capacity
- D. Density-dependent factor
(a) (i) What is nuclear fission?
(ii) State the function of each of the following ma-terials in a nuclear fision reactor:
(\(\alpha\)) graphite, (\(\beta\)) boron rods; (\(\gamma\)) liquid sodium
(b) The table below gives some of the energy levels of a hydrogen atom.
| n | 1 | 2 | 3 | 4 | 5 | \(\infty\) |
| E\(_n\)/\_eV\) | -13.60 | -3.39 | -1.51 | -0.85 | -0.54 | 0.00 |
(i) Draw the energy level diagram for the atom.
(ii) Determine the wavelength of the photon emitted when the atom goes from the energy state n = 3 to the ground state. [h = 6.6 x 10\(^{-34}\) Js, c = 3 x 10\(^{8}\)ms\(^{-1}\), e = 1.6 x 10\(^{-19}\)]
(c) A piece of ancient bone from an excavation site showed \(^{14}_{6}\)C activity of 9.5 disintegrations per minute per 1.0x10\(^{-3}\)kg. If a bone specimen from a living creature shows \(^{14}_{6}\)C activity of 12.0 disintegrations per minute per 1.0 x 1 0\(^{-3}\), determine the age of the ancient bone. [Half - life of \(^{14}_{6}\)C = 5572 years].
View Discussion (0)WAEC 2017 THEORYList six environmental factors affecting agricultural production in Nigeria. (b) Explain briefly how five of the factors listed in (a) can affect agricultural production in Nigeria
View Discussion (0)WAEC 1991 THEORYA house insured against damaged by flood was burnt down and the owner had a claims. Which of the following prevented him from making any claim? The principle of
- A. indemnity
- B. subrogation
- C. insurable interest
- D. proximate cause
The largest ocean in the world is the?
- A. Atlantic Ocean
- B. Indian Ocean
- C. Arctic Ocean
- D. Pacific Ocean
A young female cattle which has never calved is known as
- A. bullock
- B. steer
- C. yearling
- D. heifer
A row in a database table is referred to as?
- A. attribute
- B. data item
- C. field
- D. record
As book is to_____________so also is teaching is to________________
- (a) School, teach
- (b)Reading, lecturing
- (c)Student, teacher
- (d) Reading, teacher
Which of the followings is not a planet
- A. Pluto
- B. Mercury
- C. Venus
- D. Moon