Physics Past Questions and Answers

Water shows anomalous behaviour.

A Below 0oC
B Between 0oC and 4^oC
C At exactly 4oC
D Between 4oC and 100^oC
E Above 100oC

Question 347:

Two thermo flasks of volume Vx and Vy are filled with liquid water at an initial temperature of 0oC. After sometime the temperature were found to be 9x, 9y, respectively. Given that \(\frac{Vx}{Vy}\) = 2 and \(\frac{\theta x}{\theta y}\) = \(\frac{1}{2}\) the ratio of the heat flow into the flask is

A \(\frac{1}{4}\)
B \(\frac{1}{2}\)
C 4
D 1
E 2

Question 348:

A good calorimeter should be of

A Low specific heat capacity and low heat conductivity
B Low specific heat capacity and high heat conductivity
C High specific heat capacity and low heat conductivity
D High specific heat capacity and low heat conductivity
E Dull surface and low heat conductivity

Question 349:

Which of the following statements are NOT correct?

A Boiling occurs when the saturated vapour pressure of the liquid involved equals the external pressure
B Both the boiling point and the saturated vapour pressure of a given liquid depends on the external pressure
C The saturated vapour presssure rises with increase in temperature
D The saturated vapour pressure is independent of the volume available for the vapour
E It is possible to boil water at a lower temperature than 100oC at high altitude

Question 350:

Which of the following phenomena CANNOT be explained by the molecular theory of matter?

A Expansion
B Conduction
C Convection
D Radiation
E Evaporation