Question

Assertion (A): The chemical formula of bleaching powder is CaCl2,
Reason (R): Calcium oxide react with chlorine to form bleaching powder.
a) Both A and Rare true and R is the
correct explanation of the assertion
b) Both A and R are true and R is the
correct explanation of the assertion
c) A is false but R is true.
d) A is true but Ris false.



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Answer 1

Answer:

11th

Physics

Mechanical Properties of Solids

Elastic and Plastic Substances

Assertion (A): Steel is mor...

PHYSICS

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Asked on December 30, 2019 by

Noor Spandana

Assertion (A): Steel is more elastic than rubber.

Reason (R) : Under a given deforming force, steel is deformed less than rubber.

A) Both Assertion and Reason are true and the reason is correct explanation of the assertion

B)Both Assertion and Reason are true, but reason is not correct explanation of the assertion

C) Assertion is true, but the reason is false

D) Assertion is false, but the reason is true

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ANSWER

More elastic the material, higher the Young's Modulus.

Young's Modulus of Steel = 200 GPa

Young's Modulus of Rubber = 0.01-0.1 GPa

Young's Modulus of Steel is much higher than Rubber, So steel is more elastic than rubber.

Y = FL/Al

Y - Young's Modulus

L - Actual Length

A - Cross Section Area

l - Elongation

l = FL/AY

keeping F,L,A constant

l is inversely proportional to Y

Hence, Higher the Young's Modulus lesser the deformation (for Different Materials)