Question 56:

• JAMB 1978

The equivalent capacitance for the circuit drawn above is

A. 18µf
B. 4µf
C. 2µf
D. 12µf
E. 13µf

Question 57:

• JAMB 1979

The density 400cm³ of palm oil was 0.9gcm^-3 before frying. If the density of the oil was 0.6gm^-3 after frying,assuming no loss of oil due to spilling, its new volume was

A. 360cm³
B. 600cm³
C. 240cm³
D. 800cm³
E. 450cm³

Question 58:

• JAMB 1979

The density 400cm³ of palm oil was 0.9gcm^-3 before frying. If the density of the oil was 0.6gm^-3 after frying,assuming no loss of oil due to spilling, its new volume was

A. 360cm³
B. 600cm³
C. 240cm³
D. 800cm³
E. 450cm³

Question 59:

• JAMB 1979

Which of the following statements defines correctly the efficiency of a machine?

A. The load carried by the machine divided by effort required in carrying the load
B. The distance moved by the load divided by the distance moved by the effort
C. The useful work done by the machine divided by the total work put into the machine
D. The movement of the load divided by the movement of the effort about the same point
E. The temperature at the end of the application of the machine divided by the initial temperature

Question 60:

• JAMB 1979

A 500kg car which was initially at rest travelled with an acceleration of 5m sec^-2, its kinetic energy after 4 seconds was

A. 10⁵J
B. 2.5 x 10³J
C. 2 x 10³J
D. 5 x 10³J
E. 5 x 10^5J`