Correct Answer: D. Infra-red waves

Correct Answer: D. oxygen

Explanation

(a) Features of the Nigerian Federalism are:

(i) Division of government powers among the federal, state and local governments.

(ii) The different levels of government in Nigeria derive their powers from the constitution.

(iii) Duplication of organs of government and Civil service at all levels of government in Nigeria.

(iv) A written and rigid constitution.

(v) The supremacy of the constitution.

(vi) Existence of a bi-cameral legislature at the centre from 1979 to date.

(vii) The division of Nigeria into states.

(viii) Existence of Supreme Court for judicial interpretation and review.

(ix) The prevalence of the Federal Government law in cases of conflict.

(x) The right of secession is out-lawed.

(xi) Existence of statutory revenue allocation and sharing.

(xii) Existence of single tier police force.

(b) Problems confronting Nigeria Federation

(i) Revenue allocation: The federating states always quarrel over revenue allocation.

(ii) Minority issue: Fear of domination by minority groups.

(iii) Inter-ethnic rivalry: Due to frictions within the diverse ethnic groups, there is unhealthy rivalry.

(iv) Issue of Secession: The threats of secession is one of the problems confronting the Nigerian Federation.

(v) State /Local Government creation — Recurring agitation for the creation of new states and new local governments

(vi) Leadership: The problem of selecting acceptable national leader.

Correct Answer: B. need more air than water

Explanation

(a) The number that speak Hausa = n(H) = 25

The number that speak Igbo = n(I) = 16

The number that speak Yoruba = n(Y) = 21

Total no of students = U = 40

\(n(H \cap I) = 8 ; n(H \cap Y) = 11 ; n(Y \cap I) = 6\)

(b) \(U = n(H) + n(I) + n(Y) - n(H \cap Y) - n(H \cap I) - n(I \cap Y) + n(H \cap Y \cap I)\)

\(40 = 6 + x + 2 + x + 4 + x + 8 - x + 11 - x + 6 - x + x\)

\(40 = 37 + x \implies x = 40 - 37 = 3\)

Correct Answer: C. Chief Justice of the Federation

Correct Answer: B. 5N in the diretion of west

Explanation

The horizontal (eastward) component of the 10N force is = 10 cos60

→ 10 x 0.5 = 5N.

The equilibrant force needed to stop the body moving eastward must act in exactly the

opposite direction.

Therefore, the needed force is 5N in the direction of West

Correct Answer: C. II, IV

Explanation

Let's look at each statement. I. Always search for the middle number This is false, because what happens if the number set is jumbled. To find median, it's important to oragnize in increasing or decreasing order. II. Always arrange in increasing or decreasing order before searching for the middle number As explained in statement one explanation, this is true. III. Once arranged, if the set has an even number, just take the two middle numbers and subtract them and divide by two This s false, because once there is an even number set, you need to ADD the middle numbers and divide it by two. Essentially, the new value represents the middle of the set. IV. Once arranged, if the set has an even number, just take the two middle numbers and add them and divide by two This is true based on statement three explanation.

Correct Answer: A. negatively charged

Correct Answer: D. Naaman