Post Utme Physics Past Questions and Answers

Question 1116:

The wall separating a Bakery Oven and its environment is of height, \(10 m\); breadth, \(10 m\); and Thickness, \(25 cm\). If the rate of heat exchange between the Oven and its environment is 1000 watt and the temperature of the environment is \(27^{\circ} C\), calculate the temperature of the Oven, given that the Coefficient of thermal conductivity of the wall is \(0.054 Wm ^{-1} K ^{-1}\).

A. \(27.3^{\circ} C\)
B. \(-40.2^{\circ} C\)
C. \(40.2^{\circ} C\)
D. \(73.3^{\circ} C\)

Question 1117:

Which of the following is not an application of expansion of solids?

A. Rivets
B. Bimetal strips
C. Fitting of wheels on rims in Railway Coaches
D. Regelation

Question 1118:

Which of the following is true about melting point of a liquid?

A. The presence of dissolved impurities increases the melting of a pure solid
B. An increase in pressure decreases the melting point of a substance that contracts in volume on freezing, more than the one that expands in volume.
C. The melting point is not the same as the solidification of a substance
D. The presence of the dissolved impurities does not change the melting point of a pure solid

Question 1119:

A boy preparing to have his bath mixed \(50 kg\) of water at a temperature of \(80^{\circ} C\) with \(70 kg\) of water at a temperature of \(20^{\circ} C\). What is the temperature of the water mixture?

A. \(45^{\circ} C\)
B. \(75^{\circ} C\)
C. \(65^{\circ} C\)
D. \(35^{\circ} C\)

Question 1120:

Which of the following is not a property of sound wave?

A. Reflection
B. Diffraction
C. Polarization
D. Refraction