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(A) Every substance is super conducting ...

(A) Every substance is super conducting at room temperature. (R) A super conducting substance offers resistance to the flow of electricity

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

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The correct Answer is:
D
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AAKASH SERIES-SOLID STATE-OBJECTIVE EXERCISE -4
  1. (A) Conductivity of silicon increases by doping it with group-15 eleme...

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  2. (A) Cadmium sulphide is perfectly covalent (R) The difference of elect...

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  3. (A) Crystalline solids are anisotropic in nature (R) Crystalline subs...

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  4. (A) Packing efficiency of hep and CCP are not equal (R) hep, ccp both ...

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  5. (A) Visible light can not be used to study crystals (R) The wave lengt...

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  6. (A) All covalent solids are non conductors (R) Graphite is a ionic so...

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  7. (A) I(2), CO(2) have low melting point (R) I(2), CO(2) have weak disp...

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  8. (A) Metallic solids are electrical and thermal conductors (R) Metallic...

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  9. (A) Orthorhombic crystal system has four Bravis lattices (R) Orthorhom...

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  10. (A) F- centre brings about colour (R) Vacancy with a trapped cation is...

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  11. (A) Zinc oxide is yellow coloured when hot (R) Zinc oxide has metal e...

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  12. (A) : Crystalline solids have sharp and chara cteric melting points. ...

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  13. (A) Diamond and graphite are polymorphic forms (R) Carbon adopts diffe...

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  14. (A) : During vacancy defect the density of solid decreases (R): The ...

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  15. (A) : In many crystal structures of ionic substances cations occupy th...

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  16. (A) Single crystals are formed when the process of crystallization is ...

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  17. (A): Crystalline solids are anisotropic (R): Crystalline solids are ...

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  18. (A) In any ionic solid with Schottky defects the number of positive an...

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  19. (A) Every substance is super conducting at room temperature. (R) A sup...

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  20. (A) All types of magnetic solids become paramagnetic at elevated tempe...

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