Which of the following processes is used tore move stone from wheat?
Hand picking can be used for separation of slightly larger sized impurities.
The machine used for carrying out the process of threshing is called
Threshing machine is called thresher.
Which process is used for separation of cream from milk
Cream can be separated from milk by filtration process. Churning is used for separation of butter from milk.
Which one is used to separate a mixture of oil and water?
Oil and water form different layers on standing and they can be separated by decantation (Oil being lighter forms upper layer).
X is a separation technique based on the difference in weights of the solids in a solid-solid mixture. What is X?
X is winnowing, a process which uses the difference in weights of solids in a solid- solid mixture for separating the components.
Which method is used to separate heavier and lighter components in a mixture by wind?
Winnowing is used to separate heavier and lighter components of a mixture by wind.
Which of the following is not used in filtration?
Thresher; it is used in threshing.
A pure substance is made of
A substance is pure if its composition is constant throughout and is made up of only one type of particles i.e. atoms or molecules.
Which method will be used to remove tea leaves from brew?
Filtration method is used for the removal of tea leaves from brew.
Vinegar is a solution of acetic acid in water. What kind of mixture is vinegar?
Acetic acid and water are miscible liquids.
Which method would you use to separate the components of salt solution.
To separate salt from salt solution (salt and water mixture) we use the process of evaporation.
What is the process by which a gas changes into a liquid?
When a gas changes into a liquid, the process is known as condensation.
Generally the dirt particles are separated from pulses before cooking. For this the pulse is generally washed with water. Allowed to stand for some time and then the water is removed. It is an example of which process?
In decantation process, water (along with dirt) is removed.
Which of the following is an example of a solid-in-gas mixture?
Minute solid particles float along with vapours (fumes) in the smoke. Hence, smoke is a solid-in-gas mixture.
In a mixture, constituents exhibit
The components of a mixture are not chemically bound. Therefore, they retain their individual properties.
To get paneer, we add lemon drops to boiling milk. We can see solid paneer particles being formed. paneer is then separated by using
Paneer is separated by filtering using a strainer or fine cloth.
If boiled milk is allowed to cool for sometime and is then poured on a piece of cloth, we find that cream (malai) is left behind on cloth. This process of separating cream from milk is
It is the process of filtration. In it cloth acts as a filter.
How are grain seeds removed from their stalks?
By threshing (i.e., beating the stalks on a slab) grain seeds are separated from their stalks.
Which process is used to remove pulp from juice before drinking?
Pulp from juice is separated by filtration method.
What type of a substance is steel?
Steel is uniform in its composition. Hence, it is a homogeneous mixture of solids.
Identify the element from the following.
An element is a substance which is made up of only one type of atoms. Oxygen (O2) is diatomic in nature.
Saturated solution is
A saturated solution can dissolve more solute at a higher temperature it cannot dissolve more solute at given temperature.
A Identify the mixture from the following.
Air is mixture. The components of air are not chemically combined with one another.
Which of the following does NOT belong to the group formed by the others?
Water is a pure substance and all others are solid-in-solid and solid-in-liquid mixtures.
Which of the following statements about a mixture is TRUE?
In a mixture, the constituent substances are mixed only physically but not combined chemically. A mixture is not a pure substance as its constituents retain their properties. So, a mixture can be either homogeneous or heterogeneous.
What kind of mixtures are aerated drinks?
Aerated drinks are a mixture of carbon dioxide and water i.e. gas in liquid.
The process that we use to separate grain from stalks is_______
The process that is used to separate grains from stalks is threshing.
Which of the following is commonly used to separate bran present in flour?
through figure-of-eight movements of the head, forming a structure called the cocoon.
Salt is obtained from sea water by which process?
Salt is obtained from sea water by the process of Evaporation.
Which of the following separation techniques is used for separating a mixture of two or more gases?
Liquification involves condensation of gases. The gas which condenses first gets separated. In all the other options, atleast one of the constituents is a solid.
In winnowing the components of a mixture are separated by
In winnowing, the components of a mixture are separated by wind or blowing air.
A compound has
A compound is a pure substance containing only one kind of molecules.
Identify the compound from the following.
A compound is a substance which contains only one type of molecules i.e. CO2.
Winnowing is the commonly used method to separate lighter husk particles from heavier seeds of grains. When farmers use this method the heap near the platform for winnowing will be of
The seeds of grain being heavier will forma heap near the platform of winnowing.
If muddy water taken from a pond is allowed tost and undisturbed for some time we find that the dirt particles present in muddy water get settled at the bottom of container. This process will be called
When the heavier insoluble component of substance settles at the bottom the process is called sedimentation.
Question is based on the following flow chart which gives the techniques a student adopted to separate the constituents of a mixture.
What could the mixture be?
It is a mixture of chalk powder, sugar and water. The chalk powder gets separated from sugar water by filtration. Later, sugar from sugar water is separated by distillation.
What could substance R be?
R should be a substance which is soluble in water i.e., sugar.
What is substance Q?
Q should be a substance that is solid and insoluble in water i.e., chalk powder.
What kind of mixtures are alloys?
A mixture of solid-in-solid is called an alloy.
Which method would you use to separate soil from muddy water (i.e. soil suspended in water)
We allow the suspended soil particles to settle down (sedimentation) and then remove clear water using the process of decantation.
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