NECO Mathematics Past Questions & Answers - Page 28

136.

If \(\frac{t}{1}\) = \(\sqrt{(\frac{4\pi^2}{g}})\), what is the value of g when I = 4.5; t = 5 secs

A.

3.20 ms2

B.

11.31 ms2

C.

32.00 ms2

D.

56.57 ms2

E.

160.00 ms2

Correct answer is C

No explanation has been provided for this answer.

137.

The angle of elevation of the top (T) of a palm tree from a point (R) on the ground is 30°. The distance from R to the base (B) of the palm tree is 120m. What is the distance between T and R?

A.

60m

B.

60\(\sqrt{3}\)m

C.

80\(\sqrt{3}\)m

D.

120\(\sqrt{3}\)m

E.

240m

Correct answer is C

No explanation has been provided for this answer.

139.

A petrol attendant recorded the number of vehicles that bought petrol from him for -3 hours and recorded 12 cars and 27 buses. What is the probability that the next vehicle will be a bus?

A.

\(\frac{4}{39}\)

B.

\(\frac{4}{13}\)

C.

\(\frac{5}{13}\)

D.

\(\frac{6}{13}\)

E.

\(\frac{9}{13}\)

Correct answer is E

No explanation has been provided for this answer.

140.

If sin 30° = 0.5, what is the cosine of its complement?

A.

-0.866

B.

-0.5

C.

0.0.5

D.

0.866

E.

1

Correct answer is C

No explanation has been provided for this answer.