Question : Phosphorus is kept in water because
Option 1: Its ignition temperature is very high.
Option 2: Its ignition temperature is very low.
Option 3: Its critical temperature is high.
Option 4: Its critical temperature is low.
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Correct Answer: Its ignition temperature is very low.
Solution : The correct option is Its ignition temperature is very low.
Phosphorus is kept underwater because it is very reactive and, due to its low ignition temperature, spontaneously ignites in the air. The presence of oxygen is reduced by keeping it immersed in water, preventing it from being exposed to air, and lowering the risk of fire.
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Question : Absolute zero is a temperature at which
Option 1: Molecular motion in a gas would cease
Option 2: Water freezes
Option 3: All gases become liquid
Option 4: All gases become solid
Question : certain substances loose their electrical resistance completely at super low temperature. such substance are called
Option 1: super conductors
Option 2: semi conductors
Option 3: dilectrics
Option 4: perfect conductors
Question : Burns caused by steam are much severe than those caused by boiling water because
Option 1: Steam pierces through the pores of body quickly
Option 2: Steam has latent heat
Option 3: Steam is gas and engulfs the body quickly
Option 4: Temperature of steam is higher
Question : Absolute zero is defined as:
Option 1: the temperature at which all molecular motion ceases.
Option 2: at which water boils at 298K.
Option 3: at which liquid helium boils.
Option 4: at which the volume becomes zero.
Question : Which law was studied in the year 1787, in which it was said that the volume of a gas increases with its absolute temperature and if its absolute temperature decreases, its volume will decrease?
Option 1: Boyle’s law
Option 2: Dalton’s law
Option 3: Avogadro’s law
Option 4: Charles's law
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