The circuit diagram shown here corresponds to the logic gate:

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

Subtopic:  Logic gates |
From NCERT
NEET - 2019
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An LED is constructed from a \(\mathrm{p\text{-}n}\) junction diode using \(\mathrm{GaAsP}\). The energy gap is \(1.9~\text{eV}\). The wavelength of the light emitted will be equal to:
1. \(10.4 \times 10^{-26} \text{m}\)
2. \(654~ \text{nm}\)
3. \(654~ \text{m}\)
4. \(654\times 10^{-11}~\text{m}\)

Subtopic:  Applications of PN junction |
 78%
From NCERT
NEET - 2019
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The correct Boolean operation represented by the circuit diagram given above is:
 
1. \(\mathrm{NOR}\)
2. \(\mathrm{AND}\)
3. \(\mathrm{OR}\)
4. \(\mathrm{NAND}\)

Subtopic:  Logic gates |
 51%
From NCERT
NEET - 2019
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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 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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A transistor is operated in a common emitter configuration at constant collector voltage Vc = 1.5 V such that a change in the base current from 100 μA to 150 μA produces a change in the collector current from 5 mA to 10 mA. The current gain (β) is:

1. 67

2. 75

3. 100

4. 50

Subtopic:  Applications of Transistor (OLD NCERT) |
 70%
From NCERT
AIPMT - 2006
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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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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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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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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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