Waec Physics 2010 Past Questions and Answers

Question 21:

• WAEC 2010

Specific heat capacity 36.4 Jkg-1 K-1 of a body means that when 36.4J of heat energy is supplied to a body of

A. Mass 100kg the temperature rises by 1k
B. Mass 1kg, the temperature by 1000K
C. Mass 1kg, the temperature rises by 1K
D. Mass 100kg, the temperature rises by 1000k

Question 22:

• WAEC 2010

An electric drill rated 400W is used to drill a hole in copper of mass 400g in 20s. Calculate the rise in temperature if all the heat produced is absorbed by the copper. [specific heat capacity of copper = 400Jkg^-1K^-1]

A. 100^oC
B. 75^oC
C. 50^oC
D. 45^oC

Question 23:

• WAEC 2010

A solid of mass 0.5kg initially at 50^oC melts at 60^oC. Calculate the quantity of heat required to melt it completely. [specific heat capacity of the solid =2.0KJ kg^-1K^-1][Specific latent heat of fusion of solid =1.0 KJ kg^-1]

A. 1500J
B. 10000J
C. 10500J
D. 15000J

Question 24:

• WAEC 2010

Dew point is not affected by

A. Temperature
B. Wind
C. The amount of water vapour in the atmosphere
D. Atmospheric pressure

Question 25:

• WAEC 2010

The pressure P, volume V, and absolute temperature T of a given mass of an ideal gas change simultaneously. Which of the followng equations is correct about the gas?

A. PV = \(\frac{constant}{T}\)
B. \(\frac{P}{T} = Constant\)
C. \(\frac{P}{V} = \frac{constant}{T}\)
D. \(\frac{I}{T} = \frac{constant}{PV}\)