Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
Q79 (NDA-II/2021) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Applied everyday chemistry

Tyndall effect is a phenomenon of

Result
Your answer: —  Â·  Correct: A
Explanation

The Tyndall effect is defined as the phenomenon of scattering of light by colloidal particles [1]. When a beam of light strikes fine particles suspended in a medium—such as smoke, dust, or water droplets—the path of the beam becomes visible because the light is reflected diffusely or scattered in various directions [1]. Colloidal particles are larger than the molecules in a true solution but small enough to remain suspended; their size is typically in the range of 1 to 1000 nanometers, which is in the vicinity of the wavelength of visible light. This size allows them to deflect and scatter visible light effectively, a property that distinguishes colloids from true solutions where no such scattering occurs. While dust particles in the air can act as colloidal particles to produce this effect, the scientific definition specifically identifies the scattering mechanism by colloidal-sized particles [1].

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 10: The Human Eye and the Colourful World > 10.6.1 Tyndall Effect > p. 169
How others answered
Each bar shows the % of students who chose that option. Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
79%
got it right
✓ Thank you! We'll review this.

SIMILAR QUESTIONS

CDS-I · 2018 · Q34 Relevance score: 14.87(s)

When the Sun is near the horizon during the morning or evening, it appears reddish. The phenomenon that is responsible for this observation is

CAPF · 2022 · Q23 Relevance score: 13.50(s)

The optical phenomenon responsible for the blue color of sky is

NDA-II · 2023 · Q51 Relevance score: 13.16(s)

The streaming of light beams coming from the Sun through trees is said to have suggested that light travels in straight line. The particles on the path of light beams are visible to us because

NDA-II · 2017 · Q75 Relevance score: 12.18(s)

A rainbow is produced due to which one of the following phenomena ?

NDA-I · 2018 · Q11 Relevance score: 11.93(s)

Which one of the following is the natural phenomenon based on which a simple periscope works ?