The figure shows a logic circuit with two inputs \(A\) and \(B\) and the output \(C\). The voltage waveforms across \(A\), \(B\), and \(C\) are as given. The logic circuit gate is:
   

1. \(\mathrm{OR}\) gate
2. \(\mathrm{NOR}\) gate
3. \(\mathrm{AND}\) gate
4. \(\mathrm{NAND}\) gate

Subtopic:  Logic gates |
 83%
From NCERT
AIPMT - 2012
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The symbolic representation of four gates is shown as: 
   
Pick out which ones are for AND, NAND, and NOT gates, respectively.

1.  (i), (iv), and (iii)

2.  (ii), (iii), and (iv)

3.  (ii), (iv), and (iii)

4.  (ii), (iv), and (i)

Subtopic:  Logic gates |
 88%
From NCERT
AIPMT - 2011
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If a small amount of antimony is added to germanium crystal:
 
1. the antimony becomes an acceptor atom
2. there will be more free electrons than holes in the semiconductor
3. its resistance is increased
4. it becomes a \(p\small{-}\)type semiconductor

Subtopic:  Types of Semiconductors |
 82%
From NCERT
AIPMT - 2011
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In a forward biasing of the p-n junction:
 
1. the positive terminal of the battery is connected to the p-side and the depletion region becomes thick.
2. the negative terminal of the battery is connected to the n-side and the depletion region becomes thin.
3. the positive terminal of the battery is connected to the n-side and the depletion region becomes thin.
4. the negative terminal of the battery is connected to the p-side and the depletion region becomes thick.

Subtopic:  PN junction |
 74%
From NCERT
AIPMT - 2011
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Which one of the following statements is false?

1. Pure Si doped with trivalent impurities gives a p-type
semiconductor.
2. The majority of carriers in an n-type semiconductor are holes.
3. The minority carriers in a p-type semiconductor are electrons.
4. The resistance of intrinsic semiconductors decreases with an
increase in temperature.

Subtopic:  Types of Semiconductors |
 86%
From NCERT
AIPMT - 2010
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To get an output Y = 1 from the circuit shown below, the input must be:

 

1. A=0 B=1 C=0

2. A=0 B=0 C=1

3. A=1 B=0 C=1

4. A=1 B=0 C=0

Subtopic:  Logic gates |
 90%
From NCERT
AIPMT - 2010
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p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength:
1. 6000 Å
2. 4000 nm
3. 6000 nm
4. 4000 Å
 
Subtopic:  Energy Band theory |
 63%
From NCERT
AIPMT - 2009
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The symbolic representation of four logic gates is as shown:

(i) (ii)
(ii) (iv)



The logic symbols for OR, NOT, and NAND gates are respectively:
1. (iii), (iv), (ii)
2. (iv), (i), (iii)
3. (iv), (ii), (i)
4. (i), (iii), (iv)

Subtopic:  Logic gates |
 91%
From NCERT
AIPMT - 2009
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A p-n photodiode is made of a material with a bandgap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly:

1. 10×1014 Hz

2. 5×1014 Hz

3. 1×1014 Hz

4. 20×1014 Hz

Subtopic:  Energy Band theory | Applications of PN junction |
 81%
From NCERT
AIPMT - 2008
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The circuit is equivalent to: 
 The circuit is equivalent to | Physics Questions

1. AND gate

2. NAND gate

3. NOR gate

4. OR gate

Subtopic:  Logic gates |
 75%
From NCERT
AIPMT - 2008
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