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Question (21)

QN004962

Which sequence correctly separates muddy water by sedimentation and decantation?

(A) Tilt first, settle later
(B) Filter first, settle later
(C) Allow settling, then pour clear water
(D) Boil first, then churn

Correct Answer: C

Explanation:

First allow the solid particles to settle, then carefully pour out the clear liquid.

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Question (22)

QN004963

Which material can act as a filter because it contains tiny pores between woven threads?

(A) Glass sheet
(B) Cloth
(C) Magnet
(D) Stone slab

Correct Answer: B

Explanation:

The tiny pores in cloth allow liquid to pass while trapping larger particles.

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Question (23)

QN004964

A filter paper gives clearer water than ordinary cloth mainly because it has:

(A) Bigger pores
(B) Fewer pores
(C) Finer pores
(D) Magnetic pores

Correct Answer: C

Explanation:

Filter paper has very fine pores that trap smaller impurities.

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Question (24)

QN004965

A fisherman’s net allows water to pass through but retains fish. This works on a principle similar to:

(A) Churning
(B) Filtration
(C) Evaporation
(D) Threshing

Correct Answer: B

Explanation:

Like a filter, the net allows smaller particles (water) to pass through.

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Question (25)

QN004966

A carpenter accidentally mixes iron nails with sawdust. Which method is the quickest for separation?

(A) Handpicking only
(B) Filtration
(C) Magnetic separation
(D) Winnowing

Correct Answer: C

Explanation:

A magnet attracts iron nails and separates them quickly.

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Question (26)

QN004967

Recyclers often use magnets in waste yards because magnets can separate:

(A) Plastic from paper
(B) Iron from non-magnetic waste
(C) Water from oil
(D) Salt from water

Correct Answer: B

Explanation:

Iron is magnetic, while most other waste materials are not.

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Question (27)

QN004968

Which of the following pairs is correctly matched?

(A) Threshing – separating butter from curd
(B) Sieving – separating solids by particle size
(C) Churning – separating iron nails from sand
(D) Filtration – separating grains from stalks

Correct Answer: B

Explanation:

Sieving separates components based on particle size.

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Question (28)

QN004969

A mixture contains puffed rice and chana dal. Which method can separate them most easily?

(A) Handpicking
(B) Evaporation
(C) Sedimentation
(D) Churning

Correct Answer: A

Explanation:

The two components are easily distinguishable and can be picked by hand.

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Question (29)

QN004970

During preparation of herbal medicines, plant parts are often dried in shade. Which separation process helps remove excess water?

(A) Magnetic separation
(B) Evaporation
(C) Filtration
(D) Threshing

Correct Answer: B

Explanation:

Water evaporates from the plant materials during drying.

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Question (30)

QN004971

Which method is unsuitable for separating salt dissolved in water?

(A) Evaporation
(B) Heating
(C) Filtration
(D) Solar drying

Correct Answer: C

Explanation:

Dissolved salt particles pass through the filter.

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Question (21)

Which sequence correctly separates muddy water by sedimentation and decantation?

Explanation:

Link:

Question (22)

Which material can act as a filter because it contains tiny pores between woven threads?

Explanation:

Link:

Question (23)

A filter paper gives clearer water than ordinary cloth mainly because it has:

Explanation:

Link:

Question (24)

A fisherman’s net allows water to pass through but retains fish. This works on a principle similar to:

Explanation:

Link:

Question (25)

A carpenter accidentally mixes iron nails with sawdust. Which method is the quickest for separation?

Explanation:

Link:

Question (26)

Recyclers often use magnets in waste yards because magnets can separate:

Explanation:

Link:

Question (27)

Which of the following pairs is correctly matched?

Explanation:

Link:

Question (28)

A mixture contains puffed rice and chana dal. Which method can separate them most easily?

Explanation:

Link:

Question (29)

During preparation of herbal medicines, plant parts are often dried in shade. Which separation process helps remove excess water?

Explanation:

Link:

Question (30)

Which method is unsuitable for separating salt dissolved in water?

Explanation:

Link:

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