Question 66:

• JAMB 1979

When the vapour of a substance is in equilibrium with its own liquid, it is said to be

A. Gaseous
B. Unsaturated
C. Liquefied
D. Diffused
E. Saturated

Question 67:

• JAMB 1979

If the wavelength of a wave travelling with a velocity of 360ms-1 is 60m, the period of the wave is

A. 6s
B. 3.6s
C. 0.17s
D. 0.61s
E. 3s

Question 68:

• JAMB 1979

The heights of the mercury thread in a mercury-in-glass thermometer when in melting ice and then in steam are 3cm and 18cm respectively. At a temperature of 60^oC the height would be

A. 7.5cm
B. 9cm
C. 10.8cm
D. 12cm
E. 12.6cm

Question 69:

• JAMB 1979

An object is placed 30cm from a concave mirror of focal length 15cm. the linear magnification of the image produced is

A. O
B. \(\frac{2}{3}\)
C. 1
D. 2
E. 3

Question 70:

• JAMB 1979

If a given mass at constant pressure obeys the relation...volume is proportional to the absolute temperature...the gas is said to obey

A. Hooke's Law
B. Boyle's Law
C. Dalton's Law
D. Charles' Law
E. Newton's Law