Explanation

(a) Gross Domestic Production (GDP): This is the total market value of final goods and services produced in a country at as particular period of time. In calculating the GDP of a country, no account is taken of the nationality of those that produce the goods and services. GDP is used in determining whether the country concerned is experiencing economic growth, decline or stagnation.

(b)Gross National Product (GNP): GNP is defined as the total market value of final goods and serv-ices produced in a country over a given period of time including the net income from abroad. Basically, GNP measures the values of final goods and services that the country's citizens produced regardless of their location.

(c) Cost of living: Cost of living is the general price level of goods and services that determine how much an average household needs to meet basic necessities of life. It is measured in terms of price index. If the price level increases, the cost of living increases and the standard of living falls and vice versa.

(d) Per capita income is the national income of a country divided by her total population. It gives the average income in a country and it serves as an economic indicator of the standard of living and development.

(e)Standard of living: The standard of living indicates the volume of available goods and services at the disposal of individuals and therefore shows the level of their welfare. It is measured by per capita income. There is an inverse relationship between standard of living and cost of living.

Explanation

(a) Critical angle is defined as the angle of incidence in the denser medium for which the angle of refraction in the less dense medium is 90°.

(b) Antinodes are created in a stationary wave when an incident and its reflected waves are superposed and 180° out of phase.

(c) n = \(\frac{Sin\frac{(A + Dm)}{2}}{\sin (\frac{A}{2})}\)

= \(\frac{Sin\frac{(60 + 46.2)}{2}}{\sin (\frac{60}{2})}\)

= \(\frac{sin 53.1}{sin 30}\)

= 1.6

(d) No image is obtained on the screen because

- Object, screen and mirror are not coaxial;

- Object is placed at focal point of mirror;

- Object is placed between the focus and the pole;

- Screen is located at a distance less than or greater than actual image distance.

(e) (i) \(\frac{1}{u} + \frac{1}{v} = \frac{1}{f}\)

\(\frac{1}{v} = \frac{1}{f} - \frac{1}{u} = \frac{1}{30} - \frac{1}{7}\)

= \(\frac{5 - 2}{150} = \frac{3}{150}\)

U = 75 + 25 = 100cm

\(\frac{1}{u} + \frac{1}{v} = \frac{1}{f}\)

\(\frac{1}{100} + \frac{1}{50} = \frac{1}{50} = \frac{1}{50}\)

f = 50cm

Correct Answer: A. pressing F5

Correct Answer: D. terminal handling is eliminated by door-to-door delivery

Explanation

Road transport offers the convenience of delivering goods directly from the origin to the destination without the need for intermediate handling at terminals. This is known as door-to-door delivery. Unlike other means of transport, such as rail or air transport, where goods often need to be transferred and handled at terminals, road transport allows for seamless transportation from the shipper's location to the recipient's location.

Explanation

a) .

• A - Package
• B - Brand/trade name
• C - Label
• D - trade mark/Logo

b).

• it enhances the decorative features of the product
• It enhances the image of the product
• It protects the product from denting due to force impact
• It shows caution/warning of product handling
• It advertises the products
• It protects the product from damages by weather conditions
• It protects marketers and handlers from danger especially, if the product is toxic

c).

• It beautifies the product by making it eye-catching and stimulating consumers to buy more (impulse buying)
• It assists in the identification of the product
• It provides description of how the product is used
• It helps in advertising the product
• it shows the manufacturing and expiring dates
• It shows the contact of the company
• The quality of the label helps in grading the product value by consumers
• It is used as a compliance tool for legal and regulatory requirements (NAFDAC & SON)

Correct Answer: B. prevent oxidation of the lamp fillaments

Correct Answer: B. it lacks the power to prosecute offenders

Correct Answer: C. underground water in limestone

Correct Answer: C. vendor's account and credit to share capital account

Correct Answer: C. low level of standard of living

Explanation

An underdeveloped economy is characterized by low per capita income, low levels of living, high rate of population growth, illiteracy, technical backwardness, capital deficiency, dependence on backward agriculture, high level of unemployment, unfavourable institutions and so on.