Sand and water can be separated by :
decantation
sieving
sublimation
magnetic separation
The heterogeneous mixture of soot particles in air is a mixture of :
solid-in-solid
solid-in-gas
gas-in-solid
gas-in-gas
A pure substance is made up of :
only one kind of molecules
two or more kinds of molecules
different types of molecules
none of the above
Pure substances possess :
variable melting points and boiling points
nonuniform composition
variable properties
fixed melting points and boiling points
Wheat flour is separated from wheat bran by the method of :
handpicking
winnowing
filtration
Mixtures in which components can be distingushed are called :
heterogeneous
homogenous
pure substances
solutions
A small boy mischievously mixed small pebbles into a bag of pulses. What method will you employ to separate the mixture ?
Magnetic separation
Crystallisation
Handpicking
Filtration
Alloys are the examples of mixtures of :
Sieving can be used only when the components of the mixture have :
different sizes
different melting points
different boiling points
different specific gravities
The process by which a solid changes directly into gas is called :
condensation
sedimentation
