Your cart is empty.
Practice each question, then open the answer or worked solution.
Paheli bought some vegetables such as French beans, lady‟s finger, green chillies, brinjals and potatoes all mixed in a bag. Which of the following methods of separation would be most appropriate for her to separate them?
Ans: The correct answer is option (d) Hand picking.
Boojho’s grandmother is suffering from diabetes. Her doctor advised her to take “Lassi” with less fat content. Which of the following methods would be most appropriate for Boojho to prepare?
Ans: The correct answer is option (c) Churning.
The butter will separate from the curd during the churning process and can be removed. Less fat will be present in the remaining lassi.
Which of the following mixtures would you be able to separate using the method of filtration?
Ans: The correct answer is option (b) Cornflakes in milk. Cornflakes are insoluble in both milk and water. As a result, they can be filtered out of the milk.
Which amongst the following methods would be most appropriate to separate grains from bundles of stalks?
Ans: The correct answer is option (d) Threshing.
Four mixtures are given below
(i) Kidney beans and chickpeas
(ii) Pulses and rice
(iii) Rice flakes and corn
(iv) Potato wafers and biscuits
Which of these can be separated by the method of winnowing?
Ans: The correct answer is option (d) (iii) and (iv).
Because each of these items has its own weight, winnowing can be utilised in rice flakes, maize, potato wafers, and biscuits.
While preparing chapatis, Paheli found that the flour to be used was mixed with wheat grains. Which out of the following is the most suitable method to separate the grains from the flour?
Ans: The correct answer is option (b) Sieving.
Because of the size difference between grain and flour, sieving can be used to separate them.
You might have observed the preparation of ghee from butter and cream at home. Which method(s) can be used to separate ghee from the residue?
i) Evaporation ii) Decantation iii) Filtration iv) Churning
Which of the following combinations is the correct answer?
Ans: The correct answer is option (b) Decantation and filtration.
These two processes are the most acceptable since the mixture is made up of two independent elements in different states (ghee is liquid and residue is solid).
In an activity, a teacher dissolved a small amount of solid copper sulphate in a tumbler half filled with water. Which method would you use to get back solid copper sulphate from the solution?
Ans: The correct answer is option (b) Evaporation.
Only the water will evaporate when the solution is evaporated, leaving only solid copper sulphate.
During summer, Boojho carries water in a transparent plastic bottle to his school. One day he left his bottle in the school. The bottle still had some water left in it. The following day, he observed some water droplets on the inner surface of the empty portion of the bottle. These droplets of water were formed due to
Ans: The correct answer is option (c) Evaporation and condensation.
The water in the plastic bottles heats up and evaporates throughout the summer. When the evaporated water collides with the bottle's cover, it condenses into water droplets. These water droplets subsequently gather on the bottle's empty portion.
Paheli asked for a glass of water from Boojho. He gave her a glass of ice-cold water. Paheli observed some water droplets on the outer surface of the glass and asked Boojho how these droplets of water were formed? Which of the following should be Boojho‟s answer?
Ans: The correct answer is option (d) Condensation of atmospheric water vapour.
When ice-cold glass is exposed to air, water droplets form on the outer surface because water vapour in the atmosphere condenses.