Chapter 1:- Matter in our surrounding Flashcards
Fog is a colloidal solution of:
liquid and gas
The phenomenon of change of liquid into vapour at any temperature is:
evaporation
Which of these is a process of changing a liquid into vapour without boiling?
Evaporation
On heating, solids generally:
expand
Why does ice float on water?
because ice is less dense than water
Steam causes more severe burns than boiling water because:
it contains more energy (latent heat of evaporation)
At what temperature does water boil at normal atmospheric pressure?
100 degree celsius
The rate of diffusion is fastest in:
gas
Which of the following expands the most on heating?
solid
Which one has maximum force of attraction between particles?
solid
Which state of matter is compressible?
gas
The smell of perfume spreads due to:
diffusion
Which of the following is not a characteristic of particles of matter?
are at rest
Dry ice is the solid form of:
carbon dioxide
Which state of matter has the highest kinetic energy?
Plasma
The SI unit of temperature is:
Kelvin (K)
Which factor affects evaporation the most?
surface area
Which factor does not affect the rate of evaporation?
Pressure
Interconversion of states of matter can be brought about by changing:
temperature and pressure
Which state of matter has a definite shape and volume?
Solid
Which of the following will evaporate faster?
water kept in an open vessel
The temperature at which a solid changes into liquid is:
melting point
The process opposite to sublimation is:
Deposition
Which of these has a definite volume but no fixed shape?
liquid
