Correct Answer: D. 40 per cent

Correct Answer: B. clotting of blood

Correct Answer: D. I,II and III

Explanation

(a) The specific latent heat of fusion of ice is \(3.4 \times 10^{5}Jkg^{-1}\) means that \(3.4 \times 10^{5} J\) of hoat energy is required to change 1kg mass of ice from solid state to the liquid state without a change in temperature.

Weigh a clean, dry copper calorimeter empty, together with stirer. Half fill the calorimeter with water previously warmed to about 8°C above room temperature and reweigh it to find the mass of water. Record the temperature of the water when it is say about 5°C above room temperature and then immediately add small pieces of ice, to the water. Stir the water until all the ice is melted before adding another piece. Continue until final temperature is 5°C below the room temperature. Record this temperature. Finally, reweigh the calorimeter to find the mass of ice melted.

Calculations: Heat gained by ice in forming water = Heat lost by water and calorimeter

\(M_{1} L + M_{1} C_{w} \theta_{1} = (M_{w} C_{w} + M_{c} C_{c}) \Delta \theta\)

\(\therefore L = \frac{(M_{w} C_{w} + M_{c} C_{c}) \Delta \theta - M_{1} C_{w} \theta_{f}}{M_{1}}\)

where \(M_{1} - \text{mass of ice}\)

\(M_{c} - \text{mass of calorimeter}\)

\(C_{w} - \text{specific heat capacity of water}\)

\(C_{c} - \text{specific heat capacity of calorimeter}\)

\(\theta_{f} - \text{final temperature}\)

\(\Delta \theta - \text{change in temperature of calorimeter and water}\)

(c) In a solid, such as ice, the molecules, which are held together by inter molecular forces, vibrate about a mean position. As ice absorbs more heat, the vibration of the molecules have enough energy to overcome the force binding them together. They are now free to move about in a random fashion as in a liquid.

Correct Answer: A. 8Ω

Explanation

(a) Amos denounced the high places of Israel and pronounced that God would rise against the house of Jeroboam with the sword. Then Amaziah, the priest of Bethel, sent word to king Jeroboam that Amos had conspired against him and that :he land was not able to bear all his words. He said that Jeroboam would die by the sword and Israel must go into exile. To Amos, Amaziah said, "0 seer, go, flee to the land of Judah, eat bread there, and prophesy there; but never again prophesy at Bethel..." Amos replied, 'I am no prophet, nor a prophet's son; I am a herdsman, and a dresser of sycamore Tees. The Lord took me from following the flock to go and prophesy to my people, Israel. Therefore, hear the word of the Lord. For ordering me to shut up, your wife shall become a harlot in the city; your sons and daughters shall fail by the sword; your land shall be parcelled out by line. You yourself shall die in an unclean land and Israel shall surely go into exile away from its land."

(b) Those who oppose God should be condemned for the following reasons:

(i) Since God is our creator, it is condemnable to oppose Him.

(ii) Opponents of God are evil to others; they deceive others.

(iii) They should be opposed because their teaching leads to unhappiness and destruction.

(iv) They violate God's law, word and will.

Correct Answer: C. (x + 5y)(5x + y)

Correct Answer: D. checks and balances

Explanation

a. A contract is a agreement between two or more persons which is enforceable in law and intended to have legal relationship.

b. Reasons for consumer protection

i.Exploitation: the consumers are proted from exploitation by manufacturers through indiscriminate price increase. This is done through the price control Act.

ii.Substandard goods: Manufactures may produce goods without taking into consideration the quality desired. The standards Organisation Act checks such practice.

iii.Deceptive weights and measures: Sellers may use incorrect weights and measurements in selling goods to customers. The weights and measures Act helps prevent such practices.

iv. Sale of harmful food and Drugs Act protects the consumers against the sale of such goods.

v.Credit purchase agreement:Consumers are often not well informed about the details of credit sales agreements. They may inadvertently sign false credit facilities. The Hire Purchase Act is aimed at protecting the rights of such customers.

vi.Misleading advertisement: May claims made by advertisers about the performance of their product are not correct. The Trade Description Act was enacted to check such practices.

vii.Description of goods: Consumers are protected against unscrupulous sellers who would sell goods that are not fit for the purpose or differ from the samples or decription. The Sales of goods Act is enacted to curb this practice.

Correct Answer: B. market economies