Download App

PART - 3 CH - 10 The Human Eye and The Colourful World — Science STD 10 — Question

Gujarat BoardEnglish MediumSTD 10SciencePART - 3 CH - 10 The Human Eye and The Colourful World2 Marks
Question
Why are 'danger' signal lights red?
✓

Answer

The red light gets scattered least by fog or smoke because of its longer wavelength relative to light of any other colour. So, it can be seen even from a long distance. Therefore it is used in signals showing danger.
Colloidal solution and colloidal particles : The solution in which the particles of material do not mix or dissolve in the solvent is called colloidal solution and these particles of colloidal solution are known as colloidal particles.
Examples of colloidal solution or material : Sodium thiosulphate $\left( Na _2 S_2 O _3\right)$, milk, butter, smoke, soap-lather.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[2 Mark Questions]" from PART - 3 CH - 10 The Human Eye and The Colourful World→PART - 3 CH - 10 The Human Eye and The Colourful World — all question types→Science STD 10 question papers→Gujarat Board STD 10 question papers→Gujarat Board question paper generator→

Similar questions

Explain the idea of evolution.
→
Give the scientific reason : Few simple steps should be helpful to conserve energy resources.
→
You are given a hammer, a battery, a bulb, wires and a switch.
Assess the usefulness of these tests in distinguishing between metals and non-metals.
→
What is meant chemically by baking soda and baking powder? What happens if baking soda instead of baking powder is added, in making cake?
→
What happens at the synapse between two neurons?
→
State the formula of an electric current and define its unit.
→
Give scientific reason : The wall of the artery is thick and elastic while that of vein is relatively thin.
→
Give scientific reason : The parasitic mode of nutrition is harmful for the host organism.
→
Give scientific reasons : Candle burns with a yellow flame.
→
Distinguish between: Homologous organs and Analogous organs
→