Which of the following methods can be used to seperate blood cells from plasma?

• A. Centrifugation
• B. Filtration
• C. Chromatography
• D. Distillation

(a)(i) Define dew point. (ii) Explain why dew forms more quickly on the metal parts than on the rubber parts of a bicycle placed in the open overnight.

(b)(i) Explain the statement. the specific heat capacity of copper is 400 J/kg/K. (ii) Two metals, P and Q are supplied with the same quantity of heat.

If the ratio of the specific heat capacity of P to Q is 3 : 1 and their masses are in the ratio I:2 respectively.

calculate the ratio of the temperature rise of P to Q.

(c)(i) Define coefficient of thermal conductivity of a material.

(ii)

The diagram below illustrates a composite bar of iron and copper. The bar is insulated along its sides and it has a diameter of 10 mm. The length and thermal conductivity of the iron are 0.15 m and 40 W/m/K, respectively and those of copper are 0.05 m and 360 W/m/K, respectively. If the free ends of the iron and copper are kept at 100°C and 0°C respectively. calculate the (i) temperature at the interface between the bars; (ii) rate of heat flow along the bar.

An element in a company's economic environment is___________

• A. Personal lifestyle
• B. Family members
• C. Technological innovation
• D. Inflation rate

The introduction of Indirect Rule in Eastern Nigeria led to the Aba woman riots of

• A. 1914
• B. 1929
• C. 1935
• D. 1940

The table shows the scores obtained by a group of artistes in Vocal (X) and the instrument (Y) musical competition.

Calculate the spearman's rank correlation coefficient between the scores.

Which of the following is not a halogen?

• A. Silicon
• B. Fluorine
• C. Astatine
• D. Bromine

A metal ball of weight W falls through a column of glycerine of viscosity V. If the ball experiences an upthrust U and terminal velocity is attained, then

• A. W > U + V
• B. W = U + V
• C. W = U - V
• D. W < U + V

Consider the equilibrium reaction represented by the equation: 2SO₂(g) + O(g) ⇌ 2SO₃(g) ΔH = - 197 kJmol-1. At equilibrium, increase in the total pressure of the system brings about

• A. decrease in rate of the reaction of the system
• B. decrease in temperature of the system
• C. increase in temperature of SO₃
• D. increase in concentration of SO₂

Microsoft word serves the purpose of ________

• A. Developing other applications
• B. Creating documents
• C. Storing Documents
• D. Browsing

What is the molar mass of a substance, if 0.4 mole of the substance has a mass of 25.0g?

• A. 62.5 g
• B. 40.0 g
• C. 6.3 g
• D. 2.5 g