If r denotes the correlation coefficient between two variables, which of the following is always true?

• A. \(0< r \leq 1\)
• B. \(-1 \leq r< 1\)
• C. \(-1< r \leq 0\)
• D. \(-1 \leq r \leq 1\)

Which of the following terms is not associated with surface irrigation?

• A. tile
• B. basin
• C. dyke
• D. furrow

An arrangement whereby an organization charges a fee or royalty for the use of its technology in international marketing is__________

• A. Licensing.
• B. Franchising.
• C. Joint venture.
• D. Strategic alliance

Judas Iscariot was replaced by_________-

• A. Nicolaus
• B. Barsabbas
• C. Silas
• D. Matthias

Instruction: Choose the word opposite in meaning to the underlined word.

What should have been a source ofmotivation for him proved a terrible source of

• A. failure
• B. harm
• C. discouragement
• D. uncertainty

Bees inject an acidic substance when they sting. Which of the following chemical could be used to treat bee stings?

• A. CH₃COOH
• B. NaHCO₃
• C. C₂H₅OH
• D. H₂O₂

If a load of 1 kg stretches a cord by 1.2cm, what is the force constant of the cord? {g=10ms^-2}

• A. 866Nm-1
• B. 833Nm-1
• C. 769Nm-1
• D. 667Nm-1

The current growth in the volume of trading and financial dealing in Nigeria is helped by

• A. increased financial activities
• B. government intervention
• C. credit as a factor in business
• D. Payment for goods in cash

The power of the courts to declare legislative enactments as unconstitutional is known as judicial

• A. ruling
• B. review
• C. interpretation
• D. edict

(a)(i) With the aid of a labelled diagram describe the mode of operation of a modern X-ray tube.

(ii)State the energy transformations that take place during the operation of the X-ray tube.

(b) Define, as applied to X-rays, the following terms:

(i) hardness;

(ii) intensity.

(c) State (i) four uses of X-rays;

(ii) one hazard of over-exposure to X-rays in a radiological laboratory.