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Question (1)

QN0026366

A student mixes 20 g of common salt in 180 g of water. What is the concentration of solution in terms of mass by mass percentage?

(A) 5%
(B) 10%
(C) 15%
(D) 20%

Correct Answer: B

Explanation:

Mass % = (20 ÷ 200) × 100

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Question (2)

QN0026367

Which of the following mixtures will show the Tyndall effect most clearly?

(A) Vinegar
(B) Sugar solution
(C) Soap solution
(D) Copper sulphate solution

Correct Answer: C

Explanation:

Soap solution is a colloid.

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Question (3)

QN0026368

A sound wave travels with a speed of 360 m/s and has frequency 120 Hz. Find its wavelength.

(A) 2 m
(B) 3 m
(C) 4 m
(D) 5 m

Correct Answer: B

Explanation:

λ = v/f

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Question (4)

QN0026369

Which method is best suited for obtaining pure water from seawater?

(A) Filtration
(B) Sedimentation
(C) Distillation
(D) Winnowing

Correct Answer: C

Explanation:

Distillation separates dissolved salt from water.

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Question (5)

QN0026370

A solution contains 15 g sugar dissolved in 85 g water. What is the mass percentage of sugar?

(A) 10%
(B) 15%
(C) 20%
(D) 25%

Correct Answer: B

Explanation:

(15 ÷ 100) × 100

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Question (6)

QN0026371

Which of the following is a heterogeneous mixture?

(A) Air
(B) Brass
(C) Milk
(D) Salt solution

Correct Answer: C

Explanation:

Milk is a colloid.

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Question (7)

QN0026372

A wave completes 500 vibrations in 25 seconds. Its frequency is:

(A) 10 Hz
(B) 15 Hz
(C) 20 Hz
(D) 25 Hz

Correct Answer: C

Explanation:

Frequency = Vibrations ÷ Time

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Question (8)

QN0026373

Which process separates cream from milk in dairy industries?

(A) Sedimentation
(B) Centrifugation
(C) Filtration
(D) Evaporation

Correct Answer: B

Explanation:

It works on density difference.

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Question (9)

QN0026374

A student dissolved 25 g salt in 225 g water. Calculate mass by mass percentage of salt.

(A) 5%
(B) 10%
(C) 15%
(D) 20%

Correct Answer: B

Explanation:

Total mass = 250 g

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Question (10)

QN0026375

The speed of sound in a medium is 1500 m/s. If wavelength is 30 m, frequency is:

(A) 20 Hz
(B) 30 Hz
(C) 40 Hz
(D) 50 Hz

Correct Answer: D

Explanation:

f = v/λ

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Question (1)

A student mixes 20 g of common salt in 180 g of water. What is the concentration of solution in terms of mass by mass percentage?

Explanation:

Link:

Question (2)

Which of the following mixtures will show the Tyndall effect most clearly?

Explanation:

Link:

Question (3)

A sound wave travels with a speed of 360 m/s and has frequency 120 Hz. Find its wavelength.

Explanation:

Link:

Question (4)

Which method is best suited for obtaining pure water from seawater?

Explanation:

Link:

Question (5)

A solution contains 15 g sugar dissolved in 85 g water. What is the mass percentage of sugar?

Explanation:

Link:

Question (6)

Which of the following is a heterogeneous mixture?

Explanation:

Link:

Question (7)

A wave completes 500 vibrations in 25 seconds. Its frequency is:

Explanation:

Link:

Question (8)

Which process separates cream from milk in dairy industries?

Explanation:

Link:

Question (9)

A student dissolved 25 g salt in 225 g water. Calculate mass by mass percentage of salt.

Explanation:

Link:

Question (10)

The speed of sound in a medium is 1500 m/s. If wavelength is 30 m, frequency is:

Explanation:

Link:

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