Methods of Separation in Everyday Life — Quiz

Q1. Activity 9.6 puts separation tasks into two baskets. One basket is labelled 'To remove any one of the components that is not useful'. Which task best fits this basket?

• A. Churning curd to obtain butter
• B. Separating small stones from pulses
• C. Picking marigold flowers from a heap of flowers
• D. Separating salt from salt solution

Q2. Malli separates whole black peppers from steaming pulao and places them on the side of his plate. The method he uses is best called

• A. Sieving
• B. Handpicking
• C. Filtration
• D. Decantation

Q3. Mama tells Valli that farmers beat bundles of harvested wheat stalks on a large wooden log. The aim of this action is to

• A. Make the stalks soft for cattle
• B. Separate the grains from the stalks
• C. Blow the husk away from the grains
• D. Mix the grains with husk

Q4. In Activity 9.1, Ravi rubs roasted peanuts between his palms and then blows on them. The skins fly away because

• A. Peanut skins are heavier than peanuts
• B. Peanut skins are lighter than peanuts
• C. Peanut skins are magnetic
• D. Peanut skins dissolve in air

Q5. A farmer stands on a raised platform while winnowing wheat. Standing high helps because it

• A. Makes the soop heavier
• B. Lets the wind carry husk farther away from the grain pile
• C. Reduces the size of the husk
• D. Increases the mass of the grains

Q6. At a construction site, workers pass a heap through a large mesh tray to separate pebbles and stones from the sand. This is an everyday use of

• A. Decantation
• B. Sieving
• C. Filtration
• D. Magnetic separation

Q7. After playing in the sun, Priya finds white patches on her dark T-shirt where she had sweated. The white patches are formed because

• A. Salt dissolved in sweat is left behind after the water evaporates
• B. The cloth turns white in hot weather
• C. Salt is added to the cloth during washing
• D. Sunlight bleaches the cloth

Q8. Ravi's mother soaks rice and pulses in water, lets them settle, and then carefully pours off the water on top. The method she uses is

• A. Sieving
• B. Decantation
• C. Filtration
• D. Evaporation

Q9. Balan tries to clean muddy water using a piece of cloth. The cloth works as a filter because

• A. It dissolves the mud particles
• B. It contains very small pores between woven threads
• C. It is made of plastic threads
• D. It heats the water and evaporates the mud

Q10. Activity 9.4 filters muddy water through a filter paper kept in a funnel. After filtration

• A. Mud is collected in the conical flask as filtrate
• B. Mud passes through and water stays on the paper
• C. Mud stays on the filter paper as residue and clear water collects in the flask
• D. Both mud and water remain on the filter paper

Q11. When curd is churned with a mathni in a pot, the butter

• A. Settles at the bottom because it is heavier
• B. Floats at the top because it is lighter than buttermilk
• C. Dissolves completely in the buttermilk
• D. Evaporates from the surface

Q12. A carpenter in Shillong drops iron nails in sawdust. Malli and Valli ask him to move a magnet through the sawdust. The reason their method works is that

• A. Iron is a magnetic substance and sawdust is not
• B. Sawdust dissolves in air
• C. Iron is lighter than sawdust
• D. Sawdust is attracted to magnets

Q13. Recyclers use magnets fitted to a crane to separate scrap iron from heaps of industrial waste. This is an everyday application of

• A. Sieving
• B. Sedimentation
• C. Filtration
• D. Magnetic separation

Q14. Exercise Q2: Which of the following substances is commonly separated using the churning method?

• A. Oil from water
• B. Sand from water
• C. Cream from milk
• D. Oxygen from air

Q15. Exercise Q3: Which factor is usually essential for the filtration of muddy water?

• A. Apparatus size
• B. Presence of air
• C. Pore size of the filter
• D. Temperature of the mixture