Correct Answer: D. anecdote

Correct Answer: D. 51

Correct Answer: D) it is less expensive

Explanation

Detergent is a cleaning agent that is commonly used for washing clothes and dishes. It is more efficient than soap in cleansing because it has a unique chemical structure. One of the reasons why detergent is more efficient than soap is that it is not affected by the hardness of water, unlike soap. Hard water contains minerals such as calcium and magnesium that can react with soap to form insoluble compounds that stick to clothes and dishes, making them difficult to clean. Detergents, on the other hand, have a special structure that allows them to work well in both hard and soft water.

Another reason why detergent is more efficient than soap is that it cleans better than soap. Detergents contain surfactants, which are molecules that break down the surface tension between water and dirt, allowing them to be easily washed away. Soap, on the other hand, has a limited ability to dissolve in water, making it less effective in removing dirt and stains.

Additionally, the corresponding calcium and magnesium compounds formed when detergents react with hard water are soluble in water, which means they can be easily rinsed away. This is not the case with soap, as the compounds formed are insoluble and will remain on the clothes or dishes.

However, the given question asks us to identify the reason why detergent is not more efficient than soap, and the correct option is D, which states that detergent is less expensive than soap. This is not a reason why detergent is less efficient than soap, but rather a benefit for users who can save money by using detergent instead of soap.

Correct Answer: D) liver

Explanation

The question is asking which organ produces bile. Bile is a greenish-yellow fluid that helps in the digestion of fats. Among the options given, the correct answer is option D - Liver. The liver is a large organ located in the upper-right part of the abdomen. It produces bile which is then stored in the gallbladder. When we eat food that contains fat, the gallbladder releases bile into the small intestine where it helps to break down the fat. The pancreas, which is option B, produces enzymes that help in the digestion of carbohydrates, proteins, and fats. The spleen, which is option C, is an organ that filters the blood and helps fight infection. The stomach, which is option E, produces gastric juice that helps in the digestion of proteins and fats. Therefore, to answer this question correctly, one needs to know that the liver produces bile, which is important in the digestion of fats.

Correct Answer: D. a witness to Jesus' ministry

Explanation

(a) Construction of a fish pond:

(i) choose a suitable site

(ii) clear the site of vegetation and stump if necessary

(iii) mark out pond area

(iv) dig out pond to the required depth (1 - 7m)

(v) pond bottom should slop towards the outlet to help drainage during harvesting

(vi) make provision for a harvesting trough at the deepest end of pond

(vii) construct drainage system consisting of outlets and ditches

(viii) construct the water inlet at the shallow end and above the water level

(ix) construct the pond walls using a mixture of clay and sand

(x) seal the pond bottom with clay and firm the side walls

(xi) grass the embarkment to prevent soil erosion

(xii) construct a dyke around the pond mouth to prevent the inflow of run-off water into it.

(xiii) Fence pond with net to keep off pests.

(b) Measures for the efficient operation of an egg incubator:

(i) maintain the right temperature during incubation

(ii) test run the incubator before you set eggs inside.

(iii) maintain the right RH during incubation

(iv) allow for adequate ventilation of incubator room

(v) constant supply of oxygen in the incubator should be ensured.

(vi) create vents for the escape of CO² from incubator

(vii) a regular power supply to the incubator

(viii) place incubator away from walls

(ix) candle eggs progressively

(x) fumigate incubator before setting eggs

(xi) incubator should be handled by trained and experienced personnel

Correct Answer: D. Marcus Garvey and Casely Hayford

Correct Answer: A. 8

Explanation

(a) Outline any four advantages of concentration of industries in urban areas.

(i) Presence of skilled and unskilled labour

(ii) Creation of employment opportunities

(iii) Presence of capital

(iv) Improvement in the standard of living

(v) Linkage of industries

(vi) Encourages the development of infrastructure

(vii) Development of skilled man-power

(viii) Encourages the development of organised market

(ix) Provision of research centres.

(b) Highlight any three disadvantages of concentration of industries in urban areas.

(1) Encourages rural — urban migration

(2) Uneven development

(3) Increase in crime rate

(4) Leads to congestion e.g traffic, industries, housing etc

(5) Environmental pollution / health hazards / poor waste management

(6) Pressure on social amenities / infrastructure

(7) Structural unemployment due to low demand for industrial goods

(8) Destruction of the ecosystem

(9) Loss of farmlands

(10) Target of attack during war time

(11) Development of slums / ghettos

(c) Describe three factors responsible for the dominance of light industries in the developing countries

(1) Inadequate capital

(2) Inadequate infrastructure

(3) Availability of labour (unskilled labour)

(4) Inadequate managerial skills

(5) Less capital intensive

(6) Availability of local raw materials

(7) Production of consumer goods

(8) Low energy consumption

(9) Inadequate skilled labour

Explanation

(a) \(r = \alpha i + \beta j ; s = 2i - j\)

\(|r| = \sqrt{\alpha^{2} + \beta^{2}} ; |s| = \sqrt{2^{2} + (-1)^{2}} = \sqrt{5}\)

\(|r| = 3|s| = 3\sqrt{5}\)

\(\implies \alpha^{2} + \beta^{2} = (3\sqrt{5})^{2} = 45 .... (1)\)

\(m = 3i + 2j ; n = i + j\)

\((m - n) = (3i + 2j) - (i + j) = 2i + j\)

\(r\) is parallel to \((m - n)\), hence, they both have the same gradient.

\(\frac{\beta}{\alpha} = \frac{1}{2} \implies \alpha = 2\beta\)

Put \(\alpha = 2\beta\) in (1),

\((2\beta)^{2} + \beta^{2} = 45 \implies 5\beta^{2} = 45\)

\(\beta^{2} = 9 \implies \beta = 3\)

\(\alpha = 2\beta = 2(3) = 6\)

\(r = 6i + 3j\).

(b) \(r = 6i + 3j ; s = 2i - j\)

\((r - s) = (6i + 3j) - (2i - j) = 4i + 4j\)

\(|r - s| = \sqrt{4^{2} + 4^{2}} = \sqrt{32} = 4\sqrt{2}\)

\(Direction : \tan \theta = \frac{4}{4} = 1\)

\(\theta = 45°\)

(r - s) makes an angle of 45° with the x- axis.