Post Utme Physics Past Questions and Answers

Question 501:

The amount of heat needed to raise the temperature of \(10 kg\) of copper by \(1 k\) is its ____________

A. Internal energy
B. Specific Heat capacity
C. Heat Capacity
D. Molarheat capacity

Question 502:

Calculate the heat energy required to vapourise 50 \(g\) of water initially at \(80 oC\) if the specific heat capacity of water is \(4.2 J / g . K\).
(Specific latent heat of vapourisation of water is \(2260 J / g\) )

A. \([533000]\)
B. \(1172200 J\)
C. \(230200 J\)
D. \(113000 J\)

Question 503:

A piece of copper mass \(200 g\) is heated to \(1000 C\) and is then quickly transferred to a copper calorimeter of mass \(10 g\), containing \(100 g\) of water whose initial temperature is \(150< C >\) If the specific heat capacity of copper and water are \(400 J / kg . K\) and \(42003 / kg . K\), find the final temperature of the substance.

A. \(29.10 C\)
B. \(30.10 C \quad\)
C. \(28.40 C\)
D. \(27.40 C\)

Question 504:

Which if the following staternents is not correct about the assumptions of kinctic theory of ga ses?

A. The attraction between the molecules is negligible
B. The vol ume of molecules is negligible compared with the volume occupied by the gas.
C. The duration of a collision is negligible compared with the time between collisions
D. The molecules of the gas behave like perfectly inelastic spheres

Question 505:

The ice and steam points of an ungraduated thermometer are \(300 mm\) apart.
Calculate the length of thermometric liquid above the ice points which will correspond to a temperature of \(75 oC\)

A. \(275 mm\)
B. \(250 mm\)
C. \(225 mm\)
D. \(215 mm\)