Question 181:

• JAMB 1981

A body falls freely under gravity (g = 9.8ms^-2) from a height of 40m on to the top of a platform 0.8m above the ground. Its velocity on reaching the platform is

A. 784ms^-1
B. 80ms^-1
C. 78.4ms^-1
D. 39.2ms^-1
E. 27.7ms^-1

Question 182:

• JAMB 1981

Alternating current can induce voltage because it has a

A. Ripple value
B. Varying magnetic field
C. Weaker magnetic field than direct current
D. Stonger magnetic field than direct current
E. High peak value

Question 183:

• JAMB 1981

Two particles X and Y starting from rest cover the same distance. The acceleration of X is twice that of Y. the ratio of the time taken by X to that taken by Y is

A. \(\frac{1}{2}\)
B. \(\frac{1}{\sqrt2}\)
C. \(\frac{1}{\sqrt2}\)
D. \(\sqrt 2\)
E. 4

Question 184:

• JAMB 1981

a balloon inflated with helium gas at ground level is released. As it rises through a constant temperature atmosphere.

A. Its pressuren reduces but volume remains constant
B. Te product of pressure and volume remains constant
C. Both pressure and volume increases
D. Its pressure remains constant but the volume decreases
E. Both pressure and volume remains constant

Question 185:

• JAMB 1981

Change of state is accompanied by change of

A. Temperature
B. Volume
C. Heat content
D. Temperatureb and volume
E. Volume and heat content