Physics Past Questions and Answers

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

Question 4132:

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 4133:

When the temperature of a liquid increases, its surface tension

A Decreases
B Increases
C Remains constant
D Increases then decreases

Question 4134:

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\(_{0}\)

Question 4135:

A piece of substance of specific heat capacity 450Jkg\(^{-1}\)k\(^{1}\) falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms\(^{-2}\)]

A \(\frac{2}{9}\)ºC
B \(\frac{4}{9}\)ºC
C \(\frac{9}{2}\)ºC
D \(\frac{9}{4}\)ºC