Question 261:

• JAMB 1983

A man of mass 50kg ascends a flight of stairs 5m high in 5 seconds. If acceleration due to gravity is 10ms^-2, the power expended is

A. 100W
B. 200W
C. 250W
D. 400W
E. 500W

Question 262:

• JAMB 1983

Which of the following arrangements in the sequence shown can be used to obtain a pure spectrum of white light?

A. Source, slit, converging lens, prism, converging lens, screen.
B. Source, slit, diverging lens, prism, diverging lens, screen.
C. Source, converging lens, prism, diverging lens, screen.
D. Source, slit, prism, diverging lens, converging lens, screen.
E. Source, slit, prism, diverging lens, sreen.

Question 263:

• JAMB 1983

A milliameter with full scale deflection of 10mA has an internal resistance of 5 ohms. It would be converted to an ammeter with a full scale deflection of 1A by connecting a resistance of

A. \(\frac{5}{99}\)ohms in series with it
B. \(\frac{5}{99}\)ohms in parallel with it
C. \(\frac{99}{5}\)ohms in series with it
D. \(\frac{99}{5}\)ohms in parallel with it
E. 2 ohms in series with it

Question 264:

• JAMB 1983

The linear expansivity of brass is 2 x 10^-5oC^-1. If the volume of a piece of brass is 10cm³ at 0^oC, what will be its volume at 100^oC?

A. 10.02cm³
B. 10.04cm³
C. 10.06cm³
D. 10.20cm³
E. 102.00cm³

Question 265:

• JAMB 1983

A 24V potential difference is applied across a parallel combination of four 6-ohms resistor, The current in each resistor is

A. 1A
B. 4A
C. 16A
D. 18A
E. 36A