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STATEMENT - 1 : When a rod lying freely ...

STATEMENT - 1 : When a rod lying freely is heated, no thermal stress is developed in it.
and
STATEMENT - 2 : On heating, the length of the rod increase.

A

Both A and R are true but R is NOT the correct explanation of A

B

A is false but R is true

C

A is true but Ris false

D

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

Text Solution

Verified by Experts

The correct Answer is:
D
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Knowledge Check

  • STATEMENT - 1 : A metallic rod placed upon smooth surface is heated. The strain produced is ZERO. STATEMENT - 2 : Strain is non-zero only when stress is developed in the rod. STATEMENT - 3 : Two metallic rods of length l_(1) and l_(2) and coefficient of linear expansion alpha_(1) and alpha_(2) are heated such that the difference of their length ramains same at ALL termperatures Then (alpha_(1))/(alpha_(2))=(l_(2))/(l_(1))

    A
    TTT
    B
    FTF
    C
    FFT
    D
    FFF
  • STATEMENT 1: A free rod when heated experiences no thermal stress. STATEMENT 2: The rod when heated increases in length.

    A
    Statement 1 is true, Statement 2 is true, Statement 2 is the correct explanation of statement 1.
    B
    Statement 1 is true, Statement 2 is true
    C
    Statement 1 is true, Statement 2 is false
    D
    statement 1 is true, Statement 2 is true, Statement 2 is not the correct explanation of statement 1.
  • When a rod is heated but prevented from expanding, the stress developed is independent of

    A
    Material of the rod
    B
    Rise in temperature
    C
    Length of rod
    D
    None of above
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    A brass rod of length 50 cm and diameter 3.0 mm is joined to a steel rod of the same length and diameter. What is the change in length of the combined rod at 250^(@)C , if the original lengths are at 40.0^(@)C ? Is there a 'thermal stress' developed at the junction ? The ends of the rod are free to expand. Coefficient of linear expansion of brass = 2.0 xx 10^(-5).^(@)C^(-1) and that of steel =1.2 xx 10^(-5).^(@)C^(-1) .

    STATEMENT - 1 : A metallic rod is clamped between two fixed support. The rod is heated but not allowed to bend. Tensile stress is developed in it. STATEMENT - 2 : A metallic rod is fixed between two rigid supports. The rod is heated. The strain produced in the rod is ZERO because there is no change in length STATEMENT - 3 : The practical value of Poisson's ratio lies between 0 and 0.5.

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