Waec Physics 2009 Past Questions and Answers

Question 16:

• WAEC 2009

A faulty thermometer registers 102.5^oC t 100^oC. If the thermometer has no zero hour, what will it register at 55^oC?

A. 54.6^oC
B. 55.0^oC
C. 56.0^oC
D. 56.4^oC

Question 17:

• WAEC 2009

A rod of initial lenght 2m at a temperature of 25^oC is heated to 80^oC. Calculate the increase in length of the rod if its linear expansivity is 4.0 x 10^-3K^-1

A. 0.26m
B. 0.44m
C. 0.53m
D. 0.84m

Question 18:

• WAEC 2009

as a bicycle Tyre was being pumped up, it was noticed that contrary to Boyle's law the volume increased as the pressure increased. The best explanation of this is that Boyle's law is only true for

A. Ideal gases
B. A fixed mass of gas
C. A mixture of gases
D. A gas at variable temperature

Question 19:

• WAEC 2009

It takes 4 minutes to boil a quantity of water using an electrical heating coil. How long will it take to boil the same quantity of water using the same coil if the current is doubled? [Neglect any external heat losses]

A. 8 minutes
B. 4 minutes
C. 2 minutes
D. 1 minute

Question 20:

• WAEC 2009

When table salt is added to ice, the melting point of the ice

A. Is raised
B. Is lowered
C. Remains unchanged
D. Is first raised, then lowered