WAEC Past Questions and Answers - Page 1160

5,796.

From the diagram above, which of the following represents the vector V in component form?

A.

\(-5\sqrt{3} i + 5j\)

B.

\(3i + 3\sqrt{3}j\)

C.

\(i + 2\sqrt{3}j\)

D.

\(-2\sqrt{3}i - j\)

Correct answer is B

\(V = V\cos \theta i + V\sin \theta j\)

\(6N = 6 \cos 60 i + 6 \sin 60 j\)

= \(3i + 3\sqrt{3} j\)

5,797.

Items on the left-hand side of a total debtors account are debits in the

A.

Purchase ledger

B.

Sales ledger

C.

General ledger

D.

Journal

Correct answer is B

No explanation has been provided for this answer.

5,798.

The angle of a sector of a circle is 0.9 radians. If the radius of the circle is 4cm, find the length of the arc of the sector.

A.

3.6 cm

B.

7.6 cm

C.

8.0 cm

D.

11.6 cm

Correct answer is A

Length of arc given angle in radians = \(r \theta\)

= \(4 \times 0.9 = 3.6 cm\) 

5,799.

The distance s in metres covered by a particle in t seconds is \(s = \frac{3}{2}t^{2} - 3t\). Find its acceleration.

A.

\(1 ms^{-2}\)

B.

\(2 ms^{-2}\)

C.

\(3 ms^{-2}\)

D.

\(4 ms^{-2}\)

Correct answer is C

The two time differentiation of distance with respect to time will give the acceleration.

\(s = \frac{3}{2}t^{2} - 3t\)

\(\frac{\mathrm d s}{\mathrm d t} = v = 3t - 3\)

\(\frac{\mathrm d v}{\mathrm d t} = a = 3\)

5,800.

Which of the following is not a cause of depreciation?

A.

Inflation

B.

Erosion and decay

C.

Wear and tear

D.

Obsolescence

Correct answer is A

No explanation has been provided for this answer.