Jamb Mathematics 1978 Past Questions and Answers

Question 16:

• JAMB 1978

If a circular paper disc is trimmed in such a way that its circumference is reduced in the ratio 2:5, In what ratio is the surface area reduced?

A. 8 : 125
B. 2 : 5
C. 8 : 25
D. 4 : 25
E. 4 : 10

Question 17:

• JAMB 1978

If the four interior angles of a quadrilateral are (p + 10)o, (p - 30)o, (2p - 450o, and (p + 15)o, then p is

A. 125^o
B. 82^o
C. 135^o
D. 105^o
E. 60^o

Question 18:

• JAMB 1978

Simplify \(\frac{a - b}{a + b}\) - \(\frac{a + b}{a - b}\)

A. \(\frac{4ab}{a - b}\)
B. \(\frac{-4ab}{a^2 - b^2}\)
C. \(\frac{-4ab}{a^{-2} - b}\)
D. \(\frac{4ab}{a^{-2} - b^{-2}}\)

Question 19:

• JAMB 1978

A force of 5 units acts on a particle in the direction to the east and another force of 4 units acts on the particle in the direction north-east. The resultants of the two forces is

A. \(\sqrt{3}\) units
B. 3 units
C. \(\sqrt{41 + 20 \sqrt{2}}\) units
D. \(\sqrt{41 - 20 \sqrt{2}}\) units

Question 20:

• JAMB 1978

The minimum point on the curve y = x2 - 6x + 5 is at

A. (1, 5)
B. (2, 3)
C. (-3, -4)
D. (3, -4)