Waec Physics 2015 Past Questions and Answers

Question 16:

• WAEC 2015

The crackling noise produced by aluminum roofing sheets on a house during a hot sunny day is a result of

A. Thermal equilibrium of the sheets
B. Conduction of heat by the sheets
C. Contraction of the sheets
D. Expansion of the sheets

Question 17:

• WAEC 2015

Water is unsuitable for use as a thermometric liquid because it

A. Expands unevenly between 0^oC and 40^oC
B. Has narrow temperature range
C. Has a concave meniscus
D. Msintsin s fixed density

Question 18:

• WAEC 2015

The diagram above illustrates a block ans tackle pulley system in which an effort E supports a load of 100.0N. If the efficiency of the machine is 75%, calculate the value of E

A. 22.2N
B. 38.0N
C. 67.0N
D. 75.0N

Question 19:

• WAEC 2015

A quantity of hot water at 100^oC is added to 400g of water at 10^oC until the temperature of the mixture is 60^oC.
Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg^-1 K^-1]

A. 200g
B. 320g
C. 400g
D. 500g

Question 20:

• WAEC 2015

A battery of emf 24V is connected to three resistor P, Q and R as illustrated in the diagram. Determine the voltage across the resistor Q

A. 5v
B. 10v
C. 14v
D. 24v