Electronic Devices [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 30 - 34 of 107
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Question 30
Question Assertion-Reason▾
Assertion(Ꭺ)
Conductivity of a semiconductor increases on doping.
Reason(Ꭱ)
On doping the temperature of the semiconductor increases.
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. | Both Ꭺ and Ꭱ are false |
Question 31
Question Assertion-Reason▾
Assertion(Ꭺ)
The resistivity of a semiconductor decreases with temperature.
Reason(Ꭱ)
The atoms of a semiconductor vibrate with larger amplitude at higher temperature there by increasing its resistivity.
Choices
Choice (4) | Response | |
---|---|---|
a. | Ꭺ is true but Ꭱ is false | |
b. | Ꭺ is false but Ꭱ is true | |
c. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ | |
d. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ |
Question 32
Question MCQ▾
The energy gap for diamond is nearly
Choices
Choice (4) | Response | |
---|---|---|
a. | 1 eV | |
b. | 4 eV | |
c. | 6 eV | |
d. | 2 eV |
Question 33
Question MCQ▾
The intrinsic semiconductor becomes an insulator at
Choices
Choice (4) | Response | |
---|---|---|
a. | 0°C | |
b. | 300 K | |
c. | 0 K | |
d. | -100°C |
Question 34
Question MCQ▾
A piece of copper and the other of germanium are cooled from the room temperature to 80 K, then which of the following would be wrong statements?
(1) Resistance of each Increase
(2) Resistance of each Decrease
(3) Resistance of copper increases while that of germanium decreases
(4) Resistance of copper decreases while that of germanium increases
Select the correct answers and mark it according to the following codes:
Choices
Choice (4) | Response | |
---|---|---|
a. | 1 and 2 are correct | |
b. | 2 and 4 are correct | |
c. | 1,2 and 3 are correct | |
d. | 1 and 3 are correct |