Correct Answer: B. 22\(cm^{2}s^{-1}\)

Explanation

With radius = 7cm, \(Area = \pi r^{2} = \frac{22}{7} \times 7^{2}\)

= \(154cm^{2}\)

The next second, radius = 7.5cm, \(Area = \pi r^{2} = \frac{22}{7} \times 7.5^{2}\)

= \(176cm^{2}\)

Change in area = \((176 - 154)cm^{2} = 22cm^{2}\)

\(\therefore\) The rate of increase = \(22cm^{2}s^{-1}\)

OR

\(Area (A) = \pi r^{2} \implies \frac{\mathrm d A}{\mathrm d r} = 2\pi r\)

Given \(\frac{\mathrm d r}{\mathrm d t} = 0.5\)

\(\frac{\mathrm d A}{\mathrm d r} \times \frac{\mathrm d r}{\mathrm d t} = \frac{\mathrm d A}{\mathrm d t}\)

\(\frac{\mathrm d A}{\mathrm d t} = 2\pi r \times 0.5 = 2 \times \frac{22}{7} \times 7 \times 0.5\)

= \(22cm^{2}s^{-1}\)

Correct Answer: B. CH₃COOCH₃

Correct Answer: B. a limited liability company

Correct Answer: C. Patani

Correct Answer: D. precipitation and temperature

Correct Answer: D) concentrated H4SO4

Explanation

(a) Map of Nigeria showing (i) Ibadan, (ii) Owerri (iii) Bernin Kebbi (iv) Fadama plain of Sokoto and Cross river.

(b) Factors that encourage tourism in Nigeria:

(i) Favourable climate (ii) Beautiful sceneries' e.g sandy beaches, caves, etc

(iii) Relative political stability (iv) Interesting culture/festivals (v) Wildlife (vi) Nature reserves

(vii) Historical monuments/sites

(viii) Hospitality of the people (ix) Publicity

(x) Relative security (.xi) Hotels of international

standard (xii)Availability of capital

(xiii) Outstanding Inan-made features. e.g Kainji dam. National theatre. National parks, etc.

(xiv) Availability good transport network

(xv) Availability of communication network

(xvi)Appreciation of leisure

(xvii) Favourable government policy

(xviii) Need to earn foreign exchange.

(c) Problems hindering tourism in Nigeria

(i) Inadequate accommodation

(ii) Inadequate capital/funding

(iii) Heavy tax on tourism entrepreneurs

(iv) Low patronage (v) Poor sanitation

(vi) Poor transportation network (vii) Competition from sister countries (viii) Insecurity/political problems

(ix) Inadequate publicity/awareness (x) Limited holiday centres (xi) Inability to explore and develop new tourist attractions/destinations

(xii) Poor quality services

(xiii) Easy spread of.diseases (xiv) Low income level

(xv) Limited local entrepreneurship (xvi) Poor management (xvii) Inconsistent government policies

(xviii) Poor infrastructure/social amenities (xix) Negative reportage (xx) Inefficient communication network

(xxi) High cost of services/inflation (xxii) Deforestation (xxiii) Bush burning

Correct Answer: C. Ammonium chloride

Correct Answer: B. predator

Correct Answer: B. 2950