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If a small amount of aluminium is added to the silicon crystal:

1. its resistance decreases.
2. it becomes a p-type semiconductor.
3. there will be fewer free electrons than holes in the semiconductor.
4. All of these are correct.
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Which of the following is correct for \(\mathrm{n}\)-type semiconductors?

1. electron is the majority carriers and trivalent atoms are dopants.
2. electrons are majority carriers and pentavalent atoms are dopants.
3. holes are majority carriers and pentavalent atoms are dopants.
4. holes are majority carriers and trivalent atoms are dopants.
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In semiconductors, which of the following gives the law of mass action?
(where symbols have their usual meanings.)
1. \(n_i=n_e=n_h\)
2. \(n_i^2=n_en_h\)
3. \(n_h>> n_e\)
4. \(n_h<<n_e\)

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The conductivity of an n-type semiconductor whose density of conduction electrons is ne, Density of holes is nh, Mobility of conduction electrons is meand Mobility of holes is mh, will be

1.  enemh + neme 

2.  eneme + nhme  

3.  eneme + mh  

4.  eneme + nhmh 

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A semiconductor is known to have an electron concentration of 8×1013 cm-3 and a hole concentration of 5×102 cm-3. The semiconductor is:

1.  n-type

2.  p-type

3.  intrinsic

4.  insulator

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