Questions

A platinum wire can be sealed through glass, but a brass wire cannot be sealed in glass because

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Platinum has greater density than brass

Platinum and glass have the same value for coefficient volume expansion

Platinum is an element while brass is an alloy

Platinum does not rust

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detailed solution

Correct option is B

To avoid cracks , the material of the wire and glass should have the same coefficient of volume expansion.Coefficient of volume expansion for glass and brass are different but for glass and platimum,coefficient of volume expansion are the same.Hence option (2) is right.

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Similar Questions

A vessel having coefficient of cubical expansion $γ_{g}$ contains liquid Of coefficient of real expansion r_R up to certain level. When Vessel
Is heated, match column I and column II.

	Column - I		Column - II
a	$γ_{g} < γ_{R}$	p	liquid level rises continuously from beginning
b	$γ_{g} = γ_{R}$	q	liquid level falls continuously from beginning
c	$γ_{g} > γ_{R}$	r	liquid level remains same
d	$γ_{g} = 0$	s	liquid level first falls and then rises