Question 721:

• JAMB 1993

Which of the following correctly describes the energy changes in the generation of light by a hydroelectric power station?

A. Electrical \(\to\) mechanical \(\to\) potential
B. Potential \(\to\)mechanical \(\to\)electrical \(\to\) light
C. Mechanical \(\to\) sound \(\to\) electrical \(\to\) light
D. Kinetic \(\to\) mechanical \(\to\) electrical \(\to\)light

Question 722:

• JAMB 1993

A plane inclined at angle \(\theta\) has a velocity ratio of 10 : 1. The inclination of the plane to the horizontal is given by

A. Tan\(\theta\) = \(\frac{1}{10}\)
B. Cot\(\theta\) = \(\frac{1}{10}\)
C. Cos\(\theta\) = \(\frac{1}{10}\)
D. Sin\(\theta\) = \(\frac{1}{10}\)

Question 723:

• JAMB 1993

A weightless vessel of dimensions 4m x 3m x 2m is filled with a liquid of density 1000kgm^-3 and sealed. What is the maximum pressure this container can exert on a flat surface? [g = 10ms^-2]

A. 9 x 10⁴NM^-2
B. 4 x 10⁴NM^-2
C. 3 x 10⁴NM^-2
D. 2 x 10⁴NM^-2

Question 724:

• JAMB 1993

An object of mass 400g and density 600kgm^-3 is suspended with a sting so that half of it is immersed in paraffin of density 900kgm^-3. The tension in the string is

A. 1.0N
B. 3.0N
C. 4.0N
D. 5.0N

Question 725:

• JAMB 1993

The thermometric properties of the thermocouple is that is

A. E.m.f. changes with temperature
B. Resistance changes with temperature
C. Volume changes with temperature
D. Pressure changes with resistance