Past Questions And Answers
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 40oC?
- A. 1.2 x 10-1cm
- B. 8.4 x 10-2cm
- C. 7.2 x10-2cm
- D. 3.6 x 10-2cm
Rahab's reward for hiding the messengers sent by Joshua to spy out the city of Jericho was that
- A. the gold, bronze and iron in the city weregiven to her
- B. the city of Jericho was spared for her sake
- C. she married one of the spies and became a queen
- D. she and her househood were spared
(a) Mention one oxide in each case, which
(i) used in bleaching
(ii) is a redish-brown gas
(iii) reacts with NaOH and also with HCI;
(iv) dissolves in water to give a solution with pH greater than 7;
(v) oxidizes hot, concentrated HCI to chlorine
(b)(i) State three methods that can be used to removo hardness in a sample of water that contains calcium hydrogentrioxocarbonate (IV).
(ii) Explain with the aid of appropriate equation, why it is not advisable to build a house with limestone in an environment polluted by sulphur (IV) oxide.
(c)(i) List two compounds of potassium which yield oxygen when heated strongly
(ii) Calculate the amount (in moles) of gas which occupies 250 cm\(^3\) at s.t.p. [1 mole of gas occupies 22.4 dm\(^3\) at s.t.p]
(iii) If 250 cm\(^3\) of a gas at s.t.p. is heated to 27°C at constant pressure, calculate its new volume.
(iv) Explain in terms of the collision theory what happens as a gas is heated at constant pressure.
View Discussion (0)WAEC 2003 THEORYWhich of the following character has a reticent nature?
- A. Jamila
- B. Bint
- C. Talle
- D. Ada
The primary aim of any political party is to
- A. pressurize the government
- B. remain in the opposition
- C. control the government
- D. ensure fair play in business
''Mary Magdalene and the other Mary went to see the sepulchre.'' ''The other Mary '',according to St Mark was the mother of
- A. James and Joses
- B. James and John
- C. Simon and Andrew
- D. Thomas and John Mark
Noble gas molecules are held together by
- A. van der Waals forces
- B. hydrogen bonds
- C. dative bonds
- D. covalent bonds
Muslims were victorious at Badr because of
- A. superior weponry
- B. support from Allah
- C. experience warfare
- D. proximity to madinnah
Diamond does not conduct electricity because it
- A. has no free valence electrons
- B. is a giant molecule
- C. contains no bonded electrons
- D. is a solid at room temperature
Test your servants for ten days; let us be given vegetables to eat and water to drink ... In the statement above, Daniel was talking to
- A) King Darius
- B) the chief of the eunuchs
- C) the steward of the chief eunuch
- D) King Artaxerxes