Correct Answer: D. 30

Correct Answer: B. 335.4m

Explanation

v = \(\lambda\)F

260 x 1.29 =335.4ms^-1

Echo time = \(\frac{2}{2}\) = 1sec.

distance = v x t

= 335.4 x 1 = 335.4m

Correct Answer: B. 64%

Explanation

Chief Toje is a rubber merchant in Urukpe who has made his mark in the business before the arrival of Oshevire. Oshevire is a younger businessman who uses better skills to produce a high quality latex preferred by the buyers. Thus, Oshevire's success in business makes Toje jealous of him. Toje considers himself as a very influential personality in the town around whom every issue or project must revolve. As such, Toje feels he cannot afford to watch his chances in business jeopardized by an up-and-coming person - Oshevire.

Thus, the war situation becomes the fertile ground on which Toje's evil seeds against Oshevire must grow. Knowing Oshevire's predicament as an Urukpe man who is married to a Simbian wife, Toje plots to implicate him as the leader of the rebel collaborators in Urukpe. Toje sends a memorandum to Major Bello accusing Oshevire of being a saboteur and enlists Rukeme to bear false witness against him before a military tribunal. This plot by Toje costs Oshevire three years in military detention but even so, Oshevire's troubles have just begun. By seizing the opportunity of Oshevire's detention to destabilize his family, Toje has brought untold tragedy in Oshevire's life.

Presenting himself as influential to the military leadership, Toje becomes the only person allowed to interact with Oshevire's family members -Aku and her son, Oghenovo. Toje takes advantage of Aku's economic vulnerability to exploit her sexually. His sexual advances to Aku are made with the hope of reviving his failing manhood. He underrates Odibo's sexual power and "uses him" as a go-between. His plan thus backfires. Toje sees Odibo's action as an insult too difficult to bear and gets into a near fatal fight with Odibo. This brings everything out into the open resulting in dishonour to Oshevire and his family.

This shameful situation compounds Oshevire's troubles and paves the way for his tragic end. Oshevire's release and subsequent home coming, pathetically turn into a curse rather than a blessing. Oshevire cannot his wife again or live in the same town that has brought so much ruin to him and his family. He opts to leave the'town with his family in the dead of the night after setting his house ablaze. Oshevire's tragic end s caused by the shame visited on his family by Toje.

Correct Answer: C. nominal value

Correct Answer: A. All of the above

Explanation

Agricultural extension services provide numerous advantages to farmers and the agricultural sector. Through agricultural extension, farmers gain increased access to modern agricultural technologies, such as improved crop varieties, efficient irrigation methods, and mechanized farming equipment. This leads to improved farm productivity and profitability.

Explanation

a)(i) Ion: (Electrically) charged atom or group of atoms formed from an atom by loss or gain of electron.

(ii) Isotopes: Atoms of the same element with the same number of protons but different number of neutrons/Mass number

(b)(i) I. \(_{(12)}\)Mg — 1s\(^2\)2s\(^2\)2p\(^6\)3s\(^2\)

\(_{(13)}\)Al — 1s\(^2\)2s\(^2\)2p\(^6\)3s\(^2\)3p\(^1\)

II. The 3p electron in Aluminium is slightly further away from the nucleus than the 3s electron of magnesium. The shielding / screening effect by the inner electrons is more in Al than in Mg. These two effects outweigh the increase in nuclear charge of Al, hence nuclear attraction for 3s is greater than the 3p.

OR

The 3s outermost orbital in Mg is fully filled and is therefore more stable than the 3p orbital in Al which is neither completely filled nor half-filled and, hence less stable. OR

3s orbital of Mg is close to the nucleus than the 3p orbital of Al, hence the nuclear attraction for the 3s is greater than the 3p.

(ii) Na\(_2\)O, MgO, P\(_4\)O\(_{(10)}\), SO\(_3\), CI\(_2\)O\(_7\), SO\(_2\), Na\(_2\)O\(_2\)

(c)(i) Allotropes are different forms of the same element in the same physical state.

(ii) Diamond and graphite.

(iii) Diamond —For making jewellery.

—For cutting hardly surface materials.

—Making abrassives

(ii) Graphite —As a lubricant.

—For making pencals.

—For making electrodes.

—Neutron moderator.

—Making crucibles.

d)(i) —Colourless.

—Has choking smell.

—Denser than air.

—Fumes in moist air.

—Soluble in water.

(ii) 2NaCl + H\(_2\)SO\(_4\) --> Na\(_2\)SO\(_4\) + 2HCl

OR

NaCl + H\(_2\)SO\(_4\) \(\to\) NaHSO\(_4\) + HCl

e) Mass of W = 5.68mg = 5.68 x 10\(^{-3}\)g

Moles of W = \(\frac{5.68 x 10^3}{28}\)

= 2.03 x 10\(^{-4}\) moles

Correct Answer: C. variable cost

Explanation

Variable cost has a positive relationship with output in such a way that if a firm produces more output, the variable cost will be greater, and if a firm produces no output, then the variable cost will be zero. The variable cost depends on the level of output.

Correct Answer: D. =

Correct Answer: B. break bulk and sell products in small units

Explanation

The primary function of a retailer is selling the products in small units to the consumers/customers. They also perform several marketing functions such as sales promotion, advertising and point of purchase display etc.