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Extremely pure samples of Ge and Si are ...

Extremely pure samples of Ge and Si are non-conductors ,but their conductivity increases suddenly on introducing …….. In their crystal lattice .

A

As

B

B

C

Both(a) and (b)

D

None

Text Solution

Verified by Experts

The correct Answer is:
C
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MBD PUBLICATION-SOLID STATE-QUESTION BANK
  1. The resistance of mercury becomes almost zero at :

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  2. All the substances become diamagnetic at :

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  3. Extremely pure samples of Ge and Si are non-conductors ,but their cond...

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  4. Solids are characterised by their properties :

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  5. A solids having no definite shape is called :

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  6. A solid having no definite geometrical shape with flat faces and sharp...

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  7. The crystals are bounded by plane faces (f), straight edges (e) and in...

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  8. A cubic crystal possesses :

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  9. A cubic crystal possesses in all ……. Elements of symmetry .

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  10. The statement that , .. It is possible to choose along the three coord...

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  11. The statement that , '' All crystals of the same substance possess the...

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  12. The statement that, .. That crystals of same substance can have differ...

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  13. The ratio of cations to anion in a octahedral close packing is :

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  14. The ratio of cations to anion in a closed pack tetrahedral is :

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  15. If a is the length of unit cell .then which one is correct relationshi...

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  16. Amorphous solids:

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  17. Which of the following will show anisotropy?

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  18. The unit cell with crystallographic dimensions a=b ne c, alpha=beta=ga...

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  19. The arrangement ABC, ABC ... is referred to as

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  20. The interparticle forces in solid hydrogen are :

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