The tilting of the earth's axis and the revolution of the earth cause

• A. differences in the length of day and night
• B. difference in time between places on different longitudes
• C. the deflection of ocean currents and winds
• D. low tides and high tidea

Mutual consultation is to shura as accountability is

• A. Hatal
• B. Tatfif
• C. Mauliyyah
• D. Riba

A tuber of cassava can be processed into powder. This explains the face that

• A. matter can change sponteneously from one state to another
• B. matter cannot be destroyed
• C. force is required to change natter from one state to another
• D. matter is made up of tiny particle

Which of the following practices is not used in conserving water?

• A. Afforestation
• B. Damming
• C. Deforestation
• D. Reforestation

(a)(i) Explain briefly each of the following terms: I. anode; II. cathode.

(ii) Sodium and aluminium are extracted by the electrolysis of molten sodium chloride and alumina respectively. Write balanced equations for the reactions at the anode and cathode during the extraction of: I. sodium; II. aluminium.

(iii) Explain briefly why extraction of aluminium is considered environmentally friendly while that of sodium is not.

(b) Consider the reaction represented by the following equation:

K\(_2\)Cr\(_2\)O\(_7\) + HC1--> KCI + CrCl\(_3\) + H\(_2\)O + Cl\(_2\)

(i) Explain briefly why this reaction is redox.

(ii) Write balanced half equations for the reaction.

(iii) Write the over-all balanced reaction equation.

(c) During the electrolysis of molten Al\(_2\)O\(_3\), a current of 6A was passed through the electrolyte for 1 hr. 30 mins. Calculate the mass of aluminium deposited at the cathode.

Which of the following properties of soil determines its water-holding capacity? I. Texture II. pH III. Colour IV. Structure

• A. I and II only
• B. I and IV only
• C. II and III only
• D. III and IV only

A fence 2.4 m tall, is 10m away from a tree of height 16m. Calculate the angle of elevation of the top of the tree from the top of the fence.

• A. 76.11°
• B. 53.67°
• C. 52.40°
• D. 51.32°

Evaluate \(\int_{\frac{1}{2}}^{1} \frac{x^{3} - 4}{x^{3}} \mathrm {d} x\).

• A. -5.5
• B. -2.0
• C. 2.0
• D. 5.5

The cell is the most basic unit of life in all known organisms. Integral to its function is its ability to maintain intracellular and extracellular boundaries. Maintaining these boundaries is the function of membranes. Which of the following choices include cells that have both a cell wall and a membrane?

• I. Bacterial cells II. Fungal cells III. Animal cells A. II and III
• B. I and II
• C. I and III
• D. I, II, and III

In which of the following molecular forms do animals store energy?

• A. Glycogen and peptidoglycan
• B. Lipids and glycogen
• C. Glycogen only
• D. Lipids only