A surface phenomenon is
Filtration
Distillation
Density
Evaporation
It can flow and change shape
Liquids
Solids
Gases
Stones
Matter that have no fixed shape but have a fixed volume is
Stone
To find the boiling point of water three students used water, at 0°C, at room temperature and luke - warm water respectively.On comparing their observations it will be found that the boiling point of water will be:
same in all the cases
least in the water taken at 0°C
maximum in the case of luke - warm water
different in all the three cases
It has a tendency to maintain their shape when subjected to outside force.
Kerosene
Dry ice is
Solid carbon dioxide
Liquid carbon dioxide
Liquid oxygen
Liquid hydrogen
In order to find the boiling point of water one of the precautions is that the bulb of the thermometer should not touch the sides of the beaker. This precaution is taken because:
sides of the beaker are at slightly higher temperature than 100°C.
sides of the beaker are at slightly lower temperature than 100°C.
the bulb of thermometer is likely to break.
none of the above.
While determining the boiling point of water, we should always use distilled water because :
impurities may break the thermometer.
impurities increase the boiling point of water.
impurities decrease the boiling point of water
impurities may stick to the thermometer making it difficult to read the temperature.
A student takes some water in a beaker and heats it over a flame to determine the boiling point of water. He keeps on taking temperature readings. He observed that the temperature of water :
keeps on increasing regularly.
keeps on increasing irregularly.
first increases slowly, then decreases rapidly and eventually becomes constant.
first increases gradually and then becomes constant.
A thermometer has 20 equal divisions between 90°C and 100°C marks. A student while determining the boiling point of water finds that the mercury thread becomes stationary at the 19th mark above 90°C. He should record the boiling point of water as :
90.19°C
99.5°C
109°C
119°C
