Physics - Study Mode

[#1261] The sparkling of a diamond is due to
Correct Answer

(A) Total internal reflection of light

Explanation

Solution: Diamond sparkles because of the total internal reflection that takes place in it, followed by the trapping of the light rays in it. Total internal reflection only takes place when light travels from a denser to a rarer medium.

[#1262] Stars appear twinkling because of ......... of light.
Correct Answer

(B) Scattering

Explanation

Solution: Stars appear twinkling because of scattering of light.

[#1263] Stars in the sky appear to twinkle due to
Correct Answer

(A) A series of refractions

Explanation

Solution: The twinkling of a star is due to atmospheric refraction of starlight.

[#1264] Supercooling is cooling of liquid ________
Correct Answer

(B) Below freezing point

Explanation

Solution: Supercooling is the process of chilling a liquid below its freezing point, without it becoming solid. A liquid below its freezing point will crystallize in the presence of a seed crystal or nucleus around which a crystal structure can form.

[#1265] Liquids and gases never show
Correct Answer

(C) Ferromagnetic property

Explanation

Solution: Ferromagnetic materials are mainly solid materials (eg. Iron, cobalt, nickel etc). And this property of ferromagnetism is only observed in the solid materials but not in the liquid or gaseous materials.