Question Library

For a transformer: \(\frac{V_s}{V_p} = \frac{N_s}{N_p}\) Given: N\(_p\) = 200 turns, N\(_s\) = 800 turns, V\(_p\) = ?, V\(_s\) = 132kv = 132000v V\(_p\) = \(\frac{V_s \times N_s}{N_p}\) V\(_p\) = \(\frac{132000 \times 200}{800}\) = 33000V

Lubricants are primarily applied to moving engine parts to reduce friction, which in turn reduces wear and tear.

Point A is at half the initial height on the vertical axis → half the number of atoms initially present. Point B is the corresponding time on the horizontal axis → the half-life.

Chemical Name: Hydrated iron(III) oxide (also known as ferric oxide) Chemical Formula: Fe\(_2\)O\(_3\). xH\(_2\)O (where x represents a variable number of water molecules. Formation Elements: It forms when iron reacts with oxygen and moisture (water) in the air.

The organic compound that gives a positive iodoform test is propan-2-ol. A positive iodoform test requires a methyl ketone (CH\(_3\)CO-) or a secondary alcohol with a methyl group at the alpha position (CH\(_3\)CH(OH)-). Propan-2-ol (CH\(_3\)CH(OH)CH\(_3\)) is a secondary alcohol containing an alpha-methyl group. During the test, it is oxidized to propanone (acetone), which then reacts with iodine and sodium hydroxide to form a yellow crystalline precipitate of iodoform.

The correct answer is decomposition (though more specifically, it is an oxidation process driven by the decomposition of an intermediate acid). When chlorine gas (Cl\(_2\)) is introduced to a colored material, it requires moisture (water) to bleach. The reaction occurs in two main steps: The Reaction with Water: Chlorine reacts with water to form hydrochloric acid (HCl) and hypochlorous acid (HClO) Decomposition: The hypochlorous acid is highly unstable. It quickly decomposes to release hydrochloric acid and a highly reactive atom known as nascent oxygen ([O])

The type of bond that exists between a copper(II) ion (Cu\(^{2+}\)) and a water molecule (H\(_2\)O) is a coordinate covalent bond (also known as a dative covalent bond or coordinate bond). The oxygen atom in the water molecule has lone pairs of electrons. The copper(II) ion has empty orbitals that can accept these electron pairs. Water acts as a ligand, donating a pair of electrons to the central Cu\(^{2+}\) ion to form a coordinate covalent bond

To balance the equation, the number of atoms for each element must be equal on both sides: Carbon (C): 2 atoms on the reactant side (C₂H₄) and 2 atoms on the product side (2CO₂). Hydrogen (H): 4 atoms on the reactant side (C₂H₄) and 4 atoms on the product side (2H₂O). Oxygen (O): 6 atoms on the reactant side (3O₂) and 6 atoms on the product side (4 from 2CO₂ + 2 from 2H₂O).

To balance the equation, the number of atoms for each element must be equal on both sides: Carbon (C): 2 atoms on the reactant side (C₂H₄) and 2 atoms on the product side (2CO₂). Hydrogen (H): 4 atoms on the reactant side (C₂H₄) and 4 atoms on the product side (2H₂O). Oxygen (O): 6 atoms on the reactant side (3O₂) and 6 atoms on the product side (4 from 2CO₂ + 2 from 2H₂O).

The passage states that the weaknesses of oral tradition as a source of history "derive from its dependence on human memory which easily fails" and that carriers may inadvertently distort facts.

The passage states that primary records include official and private documents, citing "the Kano Chronicles (official) and the Ja Ja Papers (private)" as examples in Nigerian history

The text explains that the weaknesses and low reliability of oral tradition "derive from its complete dependence on human memory which easily fails" and that carriers may inadvertently distort the information.

Near the end of the passage, the author notes that written records "are however also susceptible to subjectivity and distortion, depending on the ability or inability of the author to control personal biases."

The text directly states: "Written records are valuable sources of History. Their strength lies in the enduring nature of the written word" and explains that oral tradition has lower reliability due to its "complete dependence on human memory, which easily fails."

In Chapter 7, when Mr. Bepo confronts Mr. Egi Meko (the director of Beesway) and his accomplices while they are leading a cow into a pit at 2:50 a.m., the director fires these questions at him. They are rhetorical questions intended to challenge, dismiss, and reprimand Bepo rather than to elicit genuine answers. This quote can be found on page 37 of the novel.