To determine the boiling point of water the bulb of the thermometer should:
be completely dipped in water
just touch the bottom of the flask
be near the mouth of the flask
be just above the surface of water
While determining the melting point of ice, Karan used a glass stirrer. The purpose of using glass stirrer is to :
help the fusion process
keep the temperature uniform
increase the kinetic energy
decrease the kinetic energy
Two students Arpit and Rakshita are asked to arrange the apparatus to determine the boiling point of water. They arranged the apparatus as shown below by figures A and B respectively :
The digram in which the apparatus is correctly arranged is :
A only
B only
both A and B
neither A nor B
The aquatic animals can breathe under water due to the presence of dissolved
Oxygen
Carbon dioxide
Nitrogen
Hydrogen
The force of attraction between the particles is greater in
Liquid state
Solid state
Gaseous state
In the determination of boiling point of water, it is advised to put the bulb of the thermometer in the steam rather than in water, it is to :
reduce the error due to atmospheric pressure.
make sure that boiling point obtained is accurate even when water sample contains non - volatile impurities dissolved.
reduce the error due to expansion of glass because of heat.
obtain the boiling point in a shorter time.
It can flow and change shape
Liquids
Solids
Gases
Stones
Which one of the following figure describes the process?Solid vapours.
A
B
C
D
The quantity of matter present in an object is called its
weight
gram
mass
density
The temperature at which a liquid starts boiling at the atmospheric pressure is known as its
Fusion point
Melting point
Boiling point
Sublimation temperature