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%
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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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In the following circuit, the output Y for all possible inputs A and B is expressed by the truth table: 
    
 

1.
A B Y
0 0 0
0 1 0
1 0 0
1 1 1
2.
A B Y
0 0 1
0 1 1
1 0 1
1 1 0
3.
A B Y
0 0 1
0 1 0
1 0 0
1 1 1
4.
A B Y
0 0 0
0 1 1
1 0 1
1 1 1
Subtopic:  Logic gates |
 75%
From NCERT
AIPMT - 2007
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In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is a/an: 

1. p-type semiconductor

2. insulator

3. metal

4. n-type semiconductor

Subtopic:  Energy Band theory |
 72%
From NCERT
AIPMT - 2007
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Which of the following is an example of forward biasing?
 

1. 2.
3. 4.
Subtopic:  PN junction |
 83%
From NCERT
AIPMT - 2006
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The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage waveforms of A, B, and C are as shown below:
   
The logic circuit gate is:

1. AND gate

2. NAND gate

3. NOR gate

4. OR gate

Subtopic:  Logic gates |
 74%
From NCERT
AIPMT - 2006
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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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