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Three ideal diodes are connected to the battery as shown in the circuit. The current supplied by the battery is

1.  Zero

2.  4A

3.  2A

4.  6A

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

1.  Its resistance is decreased

2.  It becomes a p-type semiconductor

3.  There will be less free-electron than holes in semiconductor

4.  All of these are correct

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A transistor is operated in common emitter configuration at  When base current is changed from 10mA to 30mA, it produces a change in emitter current from 2A to 4A, the current amplification factor is

1.  100

2.  99

3.  10

4.  9

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When a pn junction is formed biased

1.  Depletion region becomes thick

2.  p-side is at a higher potential than n side

3.  Current flowing is zero

4.  Effective resistance is of the order of ${10}^{6}\mathrm{W}$

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When a transistor is used as a switch it is in

1.  Active state

2.  Cut off state

3.  Saturation state

4.  Both cut off state and saturation state are possible

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Complete Question Bank

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Use of transistor as an amplifier works in the region -

1.  Cut off region

2.  Saturation region

3.  Passive region

4.  Active region

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Which of the following is correct for n-type semiconductor?

1.  Electron is majority carriers and trivalent atoms are dopants

2.  Electrons are majority carriers and pentavalent atoms are a dopant

3.  Holes are majority carriers and pentavalent atom are a dopant

4.  holes are majority carriers and trivalent atoms are a dopants

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Complete Question Bank

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1.

2.

3.

4.  All of these