Simplify √30 × √40

• A. 10 √3
• B. 5 √3
• C. 20 √3
• D. 15 √3

In the following sentence, there is an underlined word and one gap. From the list of words lettered A to D, choose the one that is most nearly opposite in meaning to the underlined word and that will at the same time, correctly fill the gap in the sentence.departure.

• A. coming
• B. entrance
• C. arrival
• D. welcome

During the pre-colonial period in Eastern Nigeria autocratic rule was made difficult by the

• A. activities of secret societies
• B. ruler's fear of detronement
• C. absence of a system of centralized authority
• D. demands of pressure groups

Which of the following about a rhombus may not be true?

• A. The diagonals are equal
• B. The diagonals bisect the angles through which they pass
• C. the diagonals bisect each other
• D. The adjacent sides are equal

A quantity of ice at 10^oC is heated until the temperature of the heating vessel is 90^oC. Which of the following constants is NOT required to determine the quantity of heat supplied to the vessel?

• A. specific heat capacity of ice
• B. specific heat capacity of water
• C. specific latent heat of fusion
• D. specific latent heat of vaporization

The hepatic portal vein is often heavily loaded with food-nutrients because it carries blood

• A. directly from the heart
• B. from the liver to the heart
• C. from the small intestine to the liver
• D. from the liver to join the posterior vena cava

During the manufacture of food by plants, which of the following organism use energy from the sun?

• A. anabaena
• B. sulfur bacteria
• C. nitrosomonas sp
• D. nitrobacter sp

(a) Explain thermiopic emission

(b) State two applications of electrical conduction through gases.

(a) A plane flies due East from A(lat. 53°N, long. 25°E) to a point B(lat. 53°N, long. 85°E) at an average speed of 400 km/h. The plane then flies South from B to a point C 2000km away. Calculate, correct to the nearest whole number :

(a) the distance between A and B.

(b) the time the plane takes to reach point B ;

(c) the latitude of C.

[Take radius of the earth = 6400km; \(\pi = \frac{22}{7}\)].

The movement of the earth that causes variation in the length of the day and night is

• A. traction
• B. revolution
• C. rotation
• D. coriolis