Physics 2016 Waec Past Questions and Answers

Question 16 :

• WAEC 2016

In the clinical thermometer, the function of the kink is to i. Prevent the back flow of mercury after use. ii. Ensure the back flow of mercury after use. iii. Maintain the thermometric property of mercury. iv. Allow the temperature attained to be read.

A. I only
B. I and ii only
C. I and iv only
D. Iii and iv only

Question 17 :

• WAEC 2016

Which of the following statements correctly defines the boiling point of a liquid? The temperature at which the

A. Saturated vapour pressure equals the atmospheric pressure
B. Molecules leaves the liquid at a rate equal to the rate at which they return
C. Molecules leave the liquid at a rate higher than that at which they return
D. Molecules leave the liquid at a rate lower than the rate at which they return

Question 18 :

• WAEC 2016

The diagram given is used to determine the

A. Boiling point of water
B. Atmospheric pressure
C. Upper fixed point of a thermometer
D. Amount of water in the atmosphere

Question 19 :

• WAEC 2016

An aluminium rod of length 1.8m at 10°C is heated to proceed produce a difference in length of 0.007m. Calculate the temperature to which it is heated. (Linear expansivity of aluminium = 2.3 x 10\(^{-5}\)K\(^{-1}\)

A. 155^oC
B. 160^oC
C. 169^oC
D. 179^oC

Question 20 :

• WAEC 2016

A mercury-in-glass thermometer read 4cm at ice point and 29cm at steam point. Calculate the temperature when the mercury level is at 9cm

A. 13^oC
B. 20^oC
C. 33^oC
D. 38^oC