The force of attraction between the particles is greater in
Oxygen
Liquid state
Solid state
Gaseous state
The rate of evaporation increases with increase in
wind speed
Fusion
Melting
Cooling
When water boils, its temperature :
remains constant
first decreases then increases
keeps on increasing as long as heating is continued
may decrease or increase depending, on the place where the experiment is being carried out.
The sun and the stars glow because of the presence of
Hydrogen
Helium
Plasma
Atmosphere
The temperature at which a liquid starts boiling at the atmospheric pressure is known as its
Fusion point
Melting point
Boiling point
Sublimation temperature
At room temperature (30°C) a student sets up an apparatus to determine the melting point of ice. He takes a beaker filled with ice and dips a mercury thermometer in it.The correct observation is:
mercury in the thermometer keeps on falling till reads 1°C, it remains constant thereafter.
temperature falls, reaches 0°C, then it reamins constant even after the whole ice has melted.
the temperature falls initially but begins to rise as soon as the ice starts melting.
temperature falls, reaches to 0°C and remains constant only as long as both ice and water are present in it.
The liquid which has highest rate of evaporation is
petrol
nail-polish remover
water
alcohol
The phenomenon of change of a liquid into vapour at any temperature below its boiling point is called
Evaporation
Condensation
Distillation
Filtration
Matter that have no fixed shape but have a fixed volume is
Solids
Liquids
Gases
Stone
It can flow and change shape
Stones
