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A) Polished surface is a poor absorber b...

A) Polished surface is a poor absorber but good reflector
B) Rough surface is a good absorber and good reflector

A

A is wrong, B is correct

B

A is correct, B is wrong

C

Both A & B are correct

D

Both A & B are wrong

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-THERMAL PROPERTIES OF MATTER-EXERCISE-IA
  1. The gas constant for a molecule is (terms have usual meaning) a) K ...

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  2. The units of universal gas constant is a) Jmol^(-1)K^(-1) b) Jkg^(...

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  3. A) Generally solids are better conductors than liquids B) Liquids ar...

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  4. Water is taken in a metal container and is heated at its bottom. The a...

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  5. For a good cooking vessel, the necessary characterstics are a) Large...

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  6. A) Heat transfer by conduction & convection require a material medium ...

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  7. A) A body of low Thermal capacity gets heated or cooled quickly B) G...

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  8. Two identical conductors made of metals of coefficients of thermal con...

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  9. A) A hot hollow sphere in vacuum cools by convection B) A hot solid ...

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  10. A) Natural convection can take place in gravity free region B) Force...

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  11. In a common room heating system, Statement (A): Hot water is circula...

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  12. A) Polished surface is a poor absorber but good reflector B) Rough ...

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  13. A spherical black body is of radius 'r'. Its radiating power is 'P' an...

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  14. Statement (A) : Water can be boiled in a thin paper box without even c...

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  15. A piece of charcoal and a piece of shining steel of the same area are ...

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  16. A glass full of hot milk is poured on the table. It begins to cool gra...

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  17. A glass full of hot milk is poured on the table. It begins to cool gra...

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  18. In Newton's law of cooling, if the rates of emission of radiation by a...

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  19. In which one of the following cases does the thermal conductivity incr...

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  20. The thermal conductivites of copper, mercury and glass are respectivel...

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