Separation Methods in Science Chapter 5

What is the primary reason handpicking proves effective in separating substances?

What is the purpose of leaving the tea undisturbed for some time in the process of decantation?

Which of the following is NOT a method used to separate mixtures as described in the content?

Why does decantation not completely separate tea leaves from tea?

What is the primary difference between decantation and filtration?

What is the main reason why oil and water form separate layers when left undisturbed?

Based on the content, what is the best method for separating muddy water?

Which of the following statements best describes the process of sedimentation?

What is the primary advantage of using a tea strainer to separate tea leaves from tea?

What is the primary method used to obtain salt from seawater in the process described?

What happens to the water during the process of obtaining salt from seawater?

What is the purpose of mentioning Sambhar Lake in Rajasthan in the text?

What is the implication of the text mentioning the need for 'further purification' of the salt obtained from the mixture?

What is the main purpose of Activity 9.2, as described in the text?

What is the likely reason for using a 'black or dark coloured thick paper' in the salt solution activity?

Based on the passage, what can be inferred about the white patches on dark coloured clothes worn in hot summers?

Why is it important to have 'shallow pits' for the seawater when obtaining salt from it?

What is the primary function of the filter paper in the filtration process depicted?

What is the name of the process where solid particles are separated from a liquid using a porous barrier?

What can be inferred about the size of the mud particles in relation to the pores in the filter paper?

What type of substance is collected in the conical flask?

Which of the following is NOT mentioned as a possible alternative to filter paper in the filtration process?

What factor determines the choice of filter material for a specific task?

Valli, in the text, finds unwanted substances in the pond water. What could be the nature of these unwanted substances?

Which of the following is NOT essential for Valli to create a working water filter model?

Which technique would be most suitable for separating a mixture of sand and small pebbles?

Which technique is primarily used to separate a mixture based on the differences in the density of its components, allowing heavier components to settle down?

Which process involves using wind or air to remove lighter particles from heavier ones?

What technique is most effective in separating iron filings from a mixture of sand and iron filings?

Which of the following techniques would be effective in separating salt dissolved in water?

Which technique is best for separating a mixture of wheat grains and stalks after harvesting them?

Which of the following processes involves the conversion of a liquid into its vapor?

Which technique is used to separate larger pieces of impurities, such as stones or twigs, from a mixture of grains?

What is the process of separating grains from the stalks called?

What happens to the separated grains after threshing?

What does Valli ask Mama about the farmers?

What is Valli's concern about the farmers?

What is Valli's suggestion for separating the grain from the husk?

What is the question posed in the context about separating puffed rice from chana dal?

What is a possible reason why the farmers enjoy their work?

What is the main focus of this passage?