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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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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))

STATEMENT 1: A free rod when heated experiences no thermal stress. STATEMENT 2: The rod when heated increases in length.

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.

Thermal Stress In Rigidly Fixed Rod

Assertion A metallic rod is fixed from two ends as shown in figure. When the temperature is increased compressive stresses are developed in the rod. Reason At higher temperature, natural length of the rod will be more.

STATEMENT-1: When water is heated by a burner in metallic container its level first decreases then increases. STATEMENT-2: Thermal conductivity of metal is very compared to water.

When one end of an iron rod is heated, its other end also becomes hot soon. Name the process by which heat flows in the iron rod

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) .

JEE MAINS PREVIOUS YEAR-JEE MAIN 2021-PHYSICS (SECTION-A)
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