NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 1690  1695 of 2184
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Question number: 1690
» Electronic Devices » Logic Gates (Or, and, NOT, NAND and Nor)
Question
Assertion (Ꭺ)
The logic gate NOT cannot be built by using diode.
Reason (Ꭱ)
The output voltage and the input voltage of the diode have 180° phase difference.
Choices
Choice (4)  Response  

a.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ 

b.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

c.  Ꭺ is true but Ꭱ is false 

d.  Ꭺ is false but Ꭱ is true 

Question number: 1691
» Electronic Devices » Logic Gates (Or, and, NOT, NAND and Nor)
Question
What will be the input of A and B for the Boolean expression
Choices
Choice (4)  Response  

a.  1,0 

b.  1,1 

c.  0,1 

d.  0,0 

Passage
Doping changes the Fermi energy of a semiconductor. Consider silicon, with a gap of 1.11 eV between the top of the valence bond and the bottom of the conduction band. At 300K the Fermi level of the pure material is nearly at the midpoint of the gap. Suppose that silicon is doped with donor atoms, each of which has a state 0.15 eV below the bottom of the silicon conduction band, and suppose further that doping raises the Fermi level to 0.11 eV below the bottom of that band.
Question number: 1692 (1 of 3 Based on Passage) Show Passage
» Electronic Devices » Semiconductors
Question
Calculate the probability that a donor state in the doped material is occupied?
Choices
Choice (4)  Response  

a.  0.008 

b.  8.2 

c.  0.08 

d.  0.824 

Question number: 1693 (2 of 3 Based on Passage) Show Passage
» Electronic Devices » Semiconductors
Question
For pure silicon, calculate the probability that a state at the bottom of the silicon conduction band is occupied? (e ^{21.46} = 20.89 ⨯ 10 ^{8})
Choices
Choice (4)  Response  

a.  4.79 ⨯ 10 ^{10 } 

b.  4 ⨯ 10 ^{10} 

c.  3.42 ⨯ 10 ^{11} 

d.  5.20 ⨯ 10 ^{12} 

Question number: 1694 (3 of 3 Based on Passage) Show Passage
» Electronic Devices » Semiconductors
Question
For doped silicon, calculate the probability that a state at the bottom of the silicon conduction band is occupied? (e ^{4.254} = 70.38)
Choices
Choice (4)  Response  

a.  1.40 ⨯ 10 ^{2} 

b.  10.5 ⨯ 10 ^{2 } 

c.  5.20 ⨯ 10 ^{2} 

d.  14 ⨯ 10 ^{2} 

Question number: 1695
» Electronic Devices » Logic Gates (Or, and, NOT, NAND and Nor)
Question
P  Q  X 
0  0  0 
0  1  0 
1  0  0 
1  1  1 
Choices
Choice (4)  Response  

a.  OR 

b.  NOR 

c.  NAND 

d.  AND 
