Physics Past Questions and Answers

If a sound wave goes from a cold air region to a hot air region, its wavelength will?

A Increase
B Decrease
C Decrease then increase
D Remain constant

Question 2242:

The lowest note emitted by a stretched string has a frequency of 40Hz. How many overtones are there between 40Hz and 180Hz?

Question 2243:

A solid weighs 10.00N in air, 6N when forcefully immersed in water, and 7.0N when fully immersed in a liquid, X. Calculate the relative density of the liquid X.

A \(\frac{5}{3}\)
B \(\frac{4}{3}\)
C \(\frac{3}{4}\)
D \(\frac{7}{10}\)

Question 2244:

When the temperature of a liquid increases, its surface tension

A Decreases
B Increases
C Remains constant
D Increases then decreases

Question 2245:

A gas at a volume of V\(_{0}\) in a container at pressure p\(_{0}\) is compressed to one-fifth of its volume. What will be its pressure if the magnitude of its original temperature T is constant?

A \(\frac{p_{0}} {5}\)
B \(\frac{4p_{0}}{5}\)
C P\(_{0}\)
D 5P\(_{0}\)