Question 11:

• JAMB 1978

A palm fruit dropped to the ground from the top of a tree 45m tall. How long does it take to reach the ground? (g = 10ms^-2)

A. 9s
B. 4.5s
C. 6s
D. 7.5s
E. 3s

Question 12:

• JAMB 1978

A piece of rubber 10cm long stretches 6mm when a load of 100N is hung from it. What is the strain?

A. 60
B. 6
C. 6 x 10^-2
D. 6 x 10^-3
E. 0.6

Question 13:

• JAMB 1978

An ice cube floats in a glass of water filled to the brim. What happens when the ice melts?

A. The water level remains the same
B. There is a drop in the level of water in the glass due to condensation on its outside
C. The water in the glass overflows
D. The level of water drops because melted ice occupies less volume
E. None of the above is correct

Question 14:

• JAMB 1978

A machine gun with a mass of 5kg fires a 50g bullet at speed of 100ms^-1. The recoil speed of the machine gun is

A. 0.5 msec^-1
B. 1.5 msec^-1
C. 1 msec^-1
D. 2 msec^-1
E. 4 msec^-1

Question 15:

• JAMB 1978

mercury is a better barometric fluid than water because i. it needs no colouring ii. its density is many times greater than that of water iii. it does not wet glass iv. it has a high vapour pressure v. it has a high boiling point. which of the above statements are true?

A. I and ii only
B. I, ii and iii only
C. Iii and iv only
D. Iv and v only
E. Iii, iv and v only