Current Electricity-Potentiometer [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 1 - 5 of 27
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Question 1
Question MCQ▾
In a potentiometer experiment two cells of emf E1 and E2 are used in series and in conjunction and the balancing length is found to be 58 cm of the wire. If the polarity of E2 is reversed, then the balancing length becomes 29 cm.
The ratio of the emf of the two cells is
Choices
Choice (4) | Response | |
---|---|---|
a. | 3: 1 | |
b. | 4: 1 | |
c. | 2: 1 | |
d. | 1: 1 |
Question 2
Question Assertion-Reason▾
Assertion(Ꭺ)
A potentiometer of longer length is used for accurate measurement.
Reason(Ꭱ)
The potential gradient for a potentiometer of longer length with a given source of emf becomes small.
Choices
Choice (4) | Response | |
---|---|---|
a. | Both Ꭺ and Ꭱ are 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. | Ꭺ is true but Ꭱ is false |
Passage
A battery is connected to a potentiometer obtained at 84 cm along the wire. When a resistance of 5Ω is connected as a shunt with the cell, the balance point is obtained at 70 cm.
Question 3 (1 of 2 Based on Passage)
Question MCQ▾
Calculate the internal resistance of the cell.
Choices
Choice (4) | Response | |
---|---|---|
a. | 5 Ω | |
b. | 4 Ω | |
c. | 1 Ω | |
d. | 2 Ω |
Question 4 (2 of 2 Based on Passage)
Question MCQ▾
Find the new position of the balance point when 5 Ω resistances is replaced by 4 Ω resistors.
Choices
Choice (4) | Response | |
---|---|---|
a. | 83.3 cm | |
b. | 26.5 cm | |
c. | 67.2 cm | |
d. | 52 cm |
Question 5
Question MCQ▾
The emf of a standard cell balances across 150 cm length of a wire of potentiometer. When a resistance of 2Ω is connected as a shunt with the cell, the balance point is obtained at 100 cm. The internal resistance of the cell is
Choices
Choice (4) | Response | |
---|---|---|
a. | 2 Ω | |
b. | 0.5 Ω | |
c. | 0.1 Ω | |
d. | 1 Ω |