Default Title

Question (11)

QN0026376

Which of the following can be separated by sublimation?

(A) Sand and iron filings
(B) Salt and water
(C) Ammonium chloride and sand
(D) Oil and water

Correct Answer: C

Explanation:

Ammonium chloride sublimes.

Link:

Report Error

Question (12)

QN0026377

Which statement is correct for a true solution?

(A) It scatters light
(B) Particles settle down
(C) It is homogeneous
(D) It can be separated by filtration

Correct Answer: C

Explanation:

True solutions have uniformly distributed particles.

Link:

Report Error

Question (13)

QN0026378

A sound wave has wavelength 4 m and frequency 85 Hz. Calculate speed of sound.

(A) 170 m/s
(B) 255 m/s
(C) 340 m/s
(D) 680 m/s

Correct Answer: C

Explanation:

v = fλ

Link:

Report Error

Question (14)

QN0026379

Which process is commonly used in water treatment plants to remove suspended impurities?

(A) Fractional distillation
(B) Coagulation
(C) Sublimation
(D) Chromatography

Correct Answer: B

Explanation:

Alum helps suspended particles settle.

Link:

Report Error

Question (15)

QN0026380

A 250 g solution contains 50 g solute. The concentration of solution is:

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

Correct Answer: C

Explanation:

(50 ÷ 250) × 100

Link:

Report Error

Question (16)

QN0026381

Why is the sky visible through clean air but sunlight beam visible in dusty air?

(A) Refraction
(B) Reflection
(C) Tyndall effect
(D) Diffusion

Correct Answer: C

Explanation:

Dust particles scatter light.

Link:

Report Error

Question (17)

QN0026382

Which method is suitable for separating kerosene from water?

(A) Sieving
(B) Filtration
(C) Separating funnel
(D) Sublimation

Correct Answer: C

Explanation:

Kerosene and water are immiscible liquids.

Link:

Report Error

Question (18)

QN0026383

A wave has frequency 25 Hz. Find its time period.

(A) 0.02 s
(B) 0.04 s
(C) 0.2 s
(D) 0.4 s

Correct Answer: B

Explanation:

T = 1/f

Link:

Report Error

Question (19)

QN0026384

Which mixture among the following will not show Tyndall effect?

(A) Smoke
(B) Fog
(C) Starch solution
(D) Salt solution

Correct Answer: D

Explanation:

Salt solution is a true solution.

Link:

Report Error

Question (20)

QN0026385

A student wants to separate sand, salt and water from a mixture. Which sequence is correct?

(A) Filtration followed by evaporation
(B) Evaporation followed by filtration
(C) Winnowing followed by sublimation
(D) Distillation followed by centrifugation

Correct Answer: A

Explanation:

Sand is filtered first, then salt recovered by evaporation.

Link:

Report Error

Question (11)

Which of the following can be separated by sublimation?

Explanation:

Link:

Question (12)

Which statement is correct for a true solution?

Explanation:

Link:

Question (13)

A sound wave has wavelength 4 m and frequency 85 Hz. Calculate speed of sound.

Explanation:

Link:

Question (14)

Which process is commonly used in water treatment plants to remove suspended impurities?

Explanation:

Link:

Question (15)

A 250 g solution contains 50 g solute. The concentration of solution is:

Explanation:

Link:

Question (16)

Why is the sky visible through clean air but sunlight beam visible in dusty air?

Explanation:

Link:

Question (17)

Which method is suitable for separating kerosene from water?

Explanation:

Link:

Question (18)

A wave has frequency 25 Hz. Find its time period.

Explanation:

Link:

Question (19)

Which mixture among the following will not show Tyndall effect?

Explanation:

Link:

Question (20)

A student wants to separate sand, salt and water from a mixture. Which sequence is correct?

Explanation:

Link:

Excel With Tutors

ExcelWithTutors

For Student

For Tutors

Learn

OUR POLICY