Question 441:

• JAMB 1987

If a beaker is filled with water it is observed that the surface of the water is not horizontal at the glass-water interface. This behavior is due to

A. Friction
B. Viscosity
C. Surface tension
D. Evaporation

Question 442:

• JAMB 1987

The mechanical advantage(MA) of an inclined plane depends on

A. Its length
B. Its height
C. The product of its length and height
D. The ratio of its length to its height

Question 443:

• JAMB 1987

A load of 5N gives an extension of 0.56cm in a wire which obeys Hooke's law. What is the extension caused by a load of 20N?

A. 1.12cm
B. 2.14cm
C. 2.24cm
D. 2.52cm

Question 444:

• JAMB 1987

A cube of side 10cm and mass 0.5kg floats in a liquid with only \(\frac{1}{5}\) of its height above the liquid surface. What is the relative density of the liquid?

A. 0.125cm^-1
B. 0.250gcm^-1
C. 0.625cm^-1
D. 2.500cm^-1

Question 445:

• JAMB 1987

The distance between the fixed points of a centigrade thermometer is 20cm. What is the temperature when the mercury level is 4.5cm above the lower mark?

A. 22.5^oC
B. 29.0^oC
C. 90.0^oC
D. 100.0^oC