Post Utme Physics Past Questions and Answers

Question 506:

A piece of copper of mass \(0.55 kg\) is heated from \(570 C\) to \(1000 C\)
What is the increase in the internal energy of the copper?
(c=380 J / kg , K )

A. \(8.9 \times 103 J\)
B. \(9.8 \times 103 J\)
C. \(8.987 \times 103 J\)
D. \(9.879 \times 103 J\)

Question 507:

Two metab \(A\) and \(B\) lose the same quantity of heat when their temperatures drop from \(200 C\) to \(150 C\) If the specific heat capacity of \(A\) is thrice that of \(B\). calculate the ratio of mass of \(A\) to that of ____________

A. \(1.3\)
B. \(1: 2\)
C. \( 3: 1\)
d. \(3: 4\)

Question 508:

Which of the following is/are observed when heat energy is added to a system?
(i) the internal energy of the system increases
(ii) the volume of the system is directly proportional to the temperature
(iii) work may be done in the sumoundings.

A. (i), (ii) and (iii)
B. (iii) only
C. (i) and (iii)
D. None of the above

Question 509:

A constant volume gas thermometer records a pressure of \(240 mmHg\) at \(0 oC\) and \(300 mmHg\) at 1000 C.
Calculate the new temperature when the gas pressure is \(270 mm\) of \(Hg\)

A. \(990 C\)
B. \(950 C\)
C. \(90 C\)
D. \(900 C\)

Question 510:

In which of the following is expansion of solids a disudvantage?

A. The balance wheel of a watch
B. Fire alarms
C. The thermostat
D. The fitting of wheels in rims.