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A piece of iron is heated in a flame.It ...

A piece of iron is heated in a flame.It first becomes dull red,then becomes reddish yellow and finally turns to while hot.The correct explanation for the above observation is possible using:

A

kirchhoff's law

B

Newton's law of cooling

C

Stefan's law

D

Wiens' displacement law.

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Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if asssertion is true, but reason if false, (D) if both assertion and reason are false Assertion : When a magnet is heated to a high temperature (cogn 1,000^@C) it loses its magnetism. Reason: The temperature of 1,000^@C is quite above the Curie temperature for iron.

JBD PUBLICATION-Thermodynamics-EXAMPLE
  1. A piece of iron is heated in a flame.It first becomes dull red,then be...

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  2. Which state of matter has the greatest and least internal enrgy having...

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  3. Two systems are said to be in thermal equilibrium with each other, if ...

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  4. Is it true to say that a body at higher temperature contains more heat...

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  5. On what factors does the internal energy of an ideal gas depend?

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  6. What do you mean by thermodynamical state?

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  7. What is the importance of a absolute scale of temperature?

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  8. Define thermodynamical variables, equation of state

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  9. Is it possble to devise a heat engine which will create no thermal pol...

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  10. What is change in internal energy in isothermal process?

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  11. Does the internal energy of an ideal gas change in an adiable process?

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  12. What is the signifiance of the indicatyor diagram or PV-diagram?

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  13. Is boiling of water at normal pressure an isothermal process or adiaba...

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  14. What is nature of PV-diagram for a cyclic process?

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  15. If gamma denotes the ratio of specific heats (Cp//Cv) of a gas,then t...

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  16. What are values of isothermal and adiabatic elasticities of a gas?

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  17. Which type of motion of molecules of monoatomic gas is responsible for...

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  18. A volume of gas at atmospheric pressure is compressed adiabatically to...

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  19. What is work done by a gas in isochoric process?

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  20. On what factors does the internal energy of an ideal gas depend?

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  21. On what factors does the effeciency of Carnot'sheat engine depend?

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