NECO Past Questions and Answers - Page 141

701.

Find the surface area of a sphere whose radius is 3.5cm, correct your answer to one decimal place (π = \(\frac{22}{5}\))

A.

12.8cm2

B.

25.7cm2

C.

77.0cm2

D.

154.0cm2

E.

179.7cm2

Correct answer is D

No explanation has been provided for this answer.

702.

The length, breadth and height of a cuboid are 8cm, 7\(\frac{1}{2}\)cm and 6\(\frac{1}{2}\) cm respectively. What Is its volume in m3 (leave your answer in standard form)?

A.

3.9 × 10-1m3

B.

3.9 × 10-2m3

C.

3.9 × 10-3m3

D.

3.9 × 10-4m3

E.

3.9 × 10-5m3

Correct answer is D

No explanation has been provided for this answer.

704.

Simplify 2a2 -4ab - 6a2 - 10ab + 5ab - 5a2

A.

-9(a + b)

B.

9(a + b)

C.

-9a (a + b)

D.

9a(a - b)

E.

9b(a + b)

Correct answer is C

No explanation has been provided for this answer.

705.

An amount of money is shared among P,Q and R such that for every 3P gets, Q gets 2 and for every 1Q gets, R gets 4. Find P: Q : R

A.

3 : 1 : 4

B.

3 : 2 : 1

C.

3 : 2 : 4

D.

3 : 3 : 4

E.

3 : 2 : 8

Correct answer is E

P gets 3 Q gets 2, Q gets 1 and R gets R 

When Q gets 1 then P will get \(\frac{3}{2}\)

P : Q: R =   \(\frac{3}{2}\) : 1  : 4 

multiplying through by 2, we have

3 : 2:  8.