Correct Answer: B. leads to increased output and lower cost of production

Explanation

Division of labor is immensely important in our economic system because it allows for work to be done much more quickly and efficiently than it would be without the division of labor. Division of labor is when tasks are split up into specialized separate tasks. it brings about increased output and while minimizing cost

Correct Answer: D. Marginal cost

Explanation

Marginal cost is the additional cost incurred in the production of one more unit of a good or service.

Correct Answer: D. throwing of pebbles

Explanation

Career opportunities available to a commerce student:

1. Trading/Wholesaling Retailing
2. Marketing/salesmanship
3. Agency
4. Banking
5. Accountancy
6. Insurance
7. Transportation
8. Warehousing/Storekeeping
9. Stockbroking
10. Tourism
11. Communication
12. Advertising

(b) Functions of an entrepreneur:

i. An entrepreneur organizes all the other factors of production

ii. He provides capital.

iii. He takes the final decisions on all matters concerning the business.

v. He bears all the business risks

(c) i. Extractive industry: This deals with obtaining materials from nature or earth. Examples are farming, fishing, lumbering. mining and drilling.

ii. Construction industry: This involves the assembling of manufactured products into usable forms. It includes furniture making, construction of bridges, roads, rail, and seaports.

iii. Manufacturing industry: This involves the changing of raw materials into finished and semi-finished goods. Activities in this sector include making vehicles, textiles, refining, and brewing.

iv. Tertiary industry: This is concerned with the provision of commercial services including direct and indirect services. It involves the distribution and exchange of goods and services. Examples are banking, leaching, barbing, trading, entertainment, medical and legal services.

Correct Answer: C. HCl(aq)

Correct Answer: B. Increase in temperature will cause a decrease in the equilibrium constant

Correct Answer: D. plain topography

Explanation

all other options are wrong because they are not too suitable for chain survey to their land forms(topography) Plain topography is the most suitable in chain survey because in chain survey, the only instruments required are a pair of compass and a scale rule. On the plain topography there is no bend or contour which makes the setting of compass easy and chain throwing not be stressful

Correct Answer: C. bisector of the angles between lines PQ and ST

Explanation

(a)

Velocity- time graph:

(i) Acceleration : Gradient of AB in the graph above; (ii) retardation: Gradient of CD in the graph above; (iii) total distance covered is the area under the graph.

(b) S = average velocity x time

\(S = (\frac{u +v}{2}) \times t ... (1)\)

but \(v = u + at ... (2)\), substitute (2) in (1)

\(S = (\frac{u + u + at}{2}) \times t\)

\(S = (\frac{2u + at}{2}) \times t \)

\(S = ut + \frac{1}{2} at^{2}\)

(c) P ----------- Q ----50m------- R

40 ms\(^{-1}\) 20 ms\(^{-1}\)

Since the acceleration is uniform and using equation

\(v^{2} = u^{2} + 2as\) for the motion along QR.

\(0 = 20^{2} - 2a(50)\) (retardation)

\(0 = 400 - 100a \implies 100a = 400\)

\(a = 4 ms^{-2}\) (retardation, hence it is negative)

\(20^{2} = 40^{2} + 2(-4) s\)

\(400 = 1600 - 8s \implies 8s = 1200\)

\(s = 150m\)

Correct Answer: D. Mars