Post Utme Physics Past Questions and Answers

Question 1116:

The wall separating a Bakery Oven and its environment is of height, $10m$; breadth, $10m$; and Thickness, $25cm$. 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 $0.054W{m}^{-1}{K}^{-1}$.

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 $50kg$ of water at a temperature of ${80}^{\circ }C$ with $70kg$ 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