Current Electricity [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 38 - 41 of 291
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Question 38
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 temperatures thereby increasing its resistivity.
Choices
Choice (4) | Response | |
---|---|---|
a. | Both Ꭺ and Ꭱ are false | |
b. | Ꭺ is false but Ꭱ is true | |
c. | Ꭺ is true but Ꭱ is false | |
d. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ |
Question 39
Question MCQ▾
The shunt required for 10% of main current to be sent through the moving coil galvanometer of resistance 99 Ω will be
Choices
Choice (4) | Response | |
---|---|---|
a. | 11 Ω | |
b. | 9.9 Ω | |
c. | 90 Ω | |
d. | 0.9 Ω |
Question 40
Question MCQ▾
For the circuit shown in the figure
Select the correct answers and mark it according to the following codes:
- The potential difference across RL is 18 V
- The current I through the battery is 7.5 mA
- Ratio of powers dissipated in R1 and R2 is 3
- If R1 and R2 are interchanged magnitude of the power dissipated in RL will decrease by a factor of 9
Choices
Choice (4) | Response | |
---|---|---|
a. | 1 and 2 | |
b. | 1 and 3 | |
c. | 1,2 and 3 | |
d. | 2 and 4 |
Question 41
Question MCQ▾
An ammeter with internal resistance 90 Ω reads 1.85 A when connected in a circuit containing a battery and two resistors 700 Ω and 410 Ω in series. Actual current will be
Choices
Choice (4) | Response | |
---|---|---|
a. | Less than 1.85 A | |
b. | Greater than 1.85 A | |
c. | 1.85 A | |
d. | Question does not provide sufficient data or is vague |