Post Utme Physics Past Questions and Answers

Question 211:

In which of the following are the substances arranged in the descending order of their conductivities?

A. Copper, steel, glass
B. Steel, copper, glass
C. Copper, glass, steel
D. Glass, copper, steel

Question 212:

The linear expansivity of brass is \(2 \times 10^{-5} /{ }^{\circ} \mathrm{C}\); the volume of a piece of brass \(10 \mathrm{~cm}^{3}\) at \(0^{\circ} \mathrm{C}\), what will be its volume at \(100^{\circ} \mathrm{C}\) \(?\)

A. \(10.02 \mathrm{~cm}^{3}\)
B. \(10.04 \mathrm{~cm}^{3}\)
C. \(10.06 \mathrm{~cm}^{3}\)
D. \(10.20 \mathrm{~cm}^{3}\)

Question 213:

The thermometric property of the thermocouple is that its ____________

A. Emf changes with temperature
B. Resistance changes with temperature
C. Volume changes with temperature
D. Resistance changes with length

Question 214:

A concave lens of focal length \(20 \mathrm{~cm}\) forms an image \(1 / 2\) the size of the object, the object distance is ____________

A. \(100 \mathrm{~cm}\)
B. \(30 \mathrm{~cm}\)
C. \(60 \mathrm{~cm}\)
D. \(40 \mathrm{~cm}\)

Question 215:

The quality of sound depends on ____________

A. Frequency
B. Wavelength
C. Velocity
D. Harmonics