Post Utme Federal University of Technology, Owerri Physics Past Questions and Answers

Question 16:

Which of the following statements is correct?
Silvered walls of a vacuum flask are used to prevent ____________

A. Heat loss due to conduction
B. Vacuum loss
C. Heat entry into the inner flask due to convection
D. Heat loss due to radiation
E. Heat loss due to \(t\) convection

Question 17:

The point beyond which a stretch spring does not return to its original length is called the ____________

A. Breaking,point
B. Elastic limit
C. Spring constant
D. Elasticity point
E. Release point

Question 18:

The range of wavelengths of visible spectrum is \(400 nm -700 nm\) the wavelength of gamma rays is ____________

A. Longer than \(700 nm\)
B. Shorter than \(700 nm\) but longer than \(400 nm\)
C. \(550 nm\)
D. Shorter than \(400 nm\)
E. Infinite

Question 19:

Which of the following arrangements in the sequence show can he used to ohtain a pure spectrum of white light?

A. Source, slit, converging lens, prism, converging lens, screen
B. Sourceslit, diverginglens, prism, diverging lens, screen
C. Source, converging lens, prism, diverging lens, screen
D. Source, slit, diverging lens, converging lens, screen
E. Source, slit, prism, diverging lens, screen

Question 20:

The mechanical advantage (MA) of an inclined plane depends on ____________

A. Its length
B. Its height
C. The product of its length and height
D. The ratio of its length to its height