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(A): Two rods of same material but of di...

(A): Two rods of same material but of different lengths are fixed between two rigid points and subjected to same temperature rise. The thermal stress will be more for longer rod.
(R): Thermal stress is independent of the length and area of cross-section of the rod.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

Verified by Experts

The correct Answer is:
B
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AAKASH SERIES-MECHANICAL PROPERTIES OF SOLIDS-EXERCISE IB (ASSERTION (A) AND REASON ( R) TYPE QUESTIONS (STRESS; STRAIN ; ELASTICITY; YOUNGS MODULUS))
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  3. (A): Force constant K = (YA)/(l) where Y is Young's modulus. A is Area...

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  4. (A): A wire may be stiffer than another wire B. But B may stronger tha...

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  5. (A) : Wet clay does not regain its shape (R) : Young's modulus for...

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  6. (A): Two rods of same material but of different lengths are fixed betw...

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  7. (A): Metals have larger values of Young's modulus than its alloys (...

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  8. (A) : With increase in temperature, elastic property of a substance de...

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  9. (A): Elastic restoring forces may be conservative. (R): The value ...

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  11. (A): A load bearing bar is usually constructed in 'I' shape. (R):...

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  12. (A): Solids are least compressible. (R) : There is tight coupling b...

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  13. (A) : Rubber is an elastomer. (R) : Stress-strain curve of rubber ...

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  14. (A) : Steel is preferred than aluminium in heavy-duty machines (R...

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  15. (A): If radius of a sphere attached to a wire is doubled, elongation o...

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  16. (A) : Tissue of aorta is an elastomer. (R) : Strain-stress curve i...

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  17. (A): Elastomers does not obey Hooke's law. (R): For elastomers, s...

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  18. (A): Young's modulus and shear modulus are relevant only for solids. ...

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  19. (A): A deforming force in one direction can produce strain in other di...

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  20. (A) : Stress is a not vector quantity. (R): Stress can not be assig...

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