Physics Past Questions and Answers

The statement 'Heat lost by the hot body equals that gained by the cold one' is assumed when determining specific that heat capacity by the method of mixtures. Which of the following validates the assumption?
I. Lagging the Calorimeter
II. Ensuring that only S.I units are used
III. Weighing the calorimeter, the lid and the stirrer.

In the molecular explanation of conduction, heat is transferred by the

The conductivity of gases at low pressure can be termed as
I. hot cathode emission
II. thermo ionic emission
III. cold cathode emission
IV. Field emission

Which of the following media allow the transmission of sound waves through them?
I. air
II. liquid
III. solids

The earth's gravitational field intensity at its surface is about
(G = 6.7 à— 10\(^{-11}\)Nm\(^2\)/kg\(^2\), mass of the earth is 6 à— 10\(^{24}\)kg, radius of the earth is 6.4 à— 10\(^6\)m, g on the earth = 9.8m/s\(^2\))