Class 6 Science Chapter 3 MCQ

A mixture of iron filling and rice flour can be separated by “Magnet”. Rest of all are correct.

Water droplets on the outer surface of glass is formed due to condensation of atmospheric water vapour. Actually, the water vapour present in air, on coming in contact with the cold glass of water, loses energy and gets converted to liquid state, which we see as water droplets.

The droplets of water on the inner surface of bottle were formed due to evaporation and condensation. Note: The process of conversion of water vapour into liquid form is called “condensation”.

The clear liquid that remains above the sediments is called, “Supernatant”. It denotes the liquid lying above a solid residue after crystallization, precipitation, centrifugation, or other process.

Here, all the statements are correct. Hence, your answer will be option [D].

By the process of evaporation we can get back solid copper sulphate from the solution. The process of evaporation for separating a mixture is based on the fact that liquids vaporise easily whereas solids do not vaporise easily.

Water is capable of dissolving a variety of different substances as it is called “Universal solvent” not solution. Rest of all statements are correct.

Here, all the statements are correct. Hence, your answer will be option [D].

Here, all the statements are correct. Hence, your answer will be option [D].

If the saturated solution of a substance at a particular temperature is heated to a higher temperature, than the solubility of substance increases and more of substance can be dissolved in it. If the saturated solution of a substance at a particular temperature is cooled a lower temperature, than the solubility of the substance decreases and some of the dissolved substance will separate out in the form of solid crystals.

Water droplets on the outer surface of glass is formed due to condensation of atmospheric water vapour. Actually, the water vapour present in air, on coming in contact with the cold glass of water, loses energy and gets converted to liquid state, which we see as water droplets. Hence, your answer will be option [C] evaporation and condensation.

Winnowing is used to separate heavier and lighter components of a mixture by wind or by blowing air. Rice flakes and potato wafers are lighter substances in the mixture, so these are separated from the given mixture by winnowing.

Here, all the statements are correct. Hence, your answer will be option [D].

For Separation of two miscible liquids we use “Distillation” process.

Here, all the statements are correct. Hence, your answer will be option [D].

The grains are separated from stalks (on which they grow) by the process of threshing. In this process stalks (of wheat, paddy, etc.) are beaten to separate grains from the bundle of stalks. Note: This method is based on the fact that the stalks (or stems) of the crop plant are soft material whereas the grains themselves are very hard. Being soft, stalks can be broken into pieces on beating the grains remains unaffected.

If the saturated solution of a substance at a particular temperature is heated to a higher temperature, than the solubility of substance increases and more of substance can be dissolved in it. If the saturated solution of a substance at a particular temperature is cooled a lower temperature, than the solubility of the substance decreases and some of the dissolved substance will separate out in the form of solid crystals.

Filtration method is used for separating insoluble substances from a liquid. But mixture of two liquids such as oil in water cannot be separated by this method. Also salt in water and sugar in milk are completely dissolved so, cannot be separated by filtration. So, cornflakes in milk can be separated by filtration.

The droplets of water on the inner surface of bottle were formed due to evaporation and condensation. Note: The process of conversion of water vapour into liquid form is called condensation.

Water droplets on the outer surface of glass is formed due to condensation of atmospheric water vapour. Actually, the water vapour present in air, on coming in contact with the cold glass of water, loses energy and gets converted to liquid state, which we see as water droplets.

Here, all the statements are correct. Hence, your answer will be option [D].

Churning is the method by which cream (fat content) from the milk is separated. So, he should prepare “Lassi” by this process of “Churning”.

Filtration cannot remove any solid substances which are dissolved in a liquid. Rest of all statements are correct. Hence, your answer will be option [C].

The solubility of a substance in water decreases on lowering the temperature. If the saturated solution of a substance at a particular temperature is heated to a higher temperature, than the solubility of substance increases and more of substance can be dissolved in it. If the saturated solution of a substance at a particular temperature is cooled a lower temperature, than the solubility of the substance decreases and some of the dissolved substance will separate out in the form of solid crystals.

Hand-picking method would be most appropriate for her to separate vegetables because vegetables can be picked up easily by hand one by one, and can be separated.