Current Electricity-Potentiometer (NEET Physics): Questions 1 - 5 of 17

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Question number: 1

» Current Electricity » Potentiometer

MCQ▾

Question

In a potentiometer experiment two cells of emf E1 and E 2 are used in series and in conjunction and the balancing length is found to be 58 cm of the wire. If the polarity of E 2 is reversed, then the balancing length becomes 29 cm.

The ratio E1E2 of the emf of the two cells is

Choices

Choice (4) Response

a.

4: 1

b.

1: 1

c.

2: 1

d.

3: 1

Question number: 2

» Current Electricity » Potentiometer

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.

Ꭺ is true but Ꭱ is false

b.

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

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are 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 number: 3 (1 of 2 Based on Passage) Show Passage

» Current Electricity » Potentiometer

MCQ▾

Question

Calculate the internal resistance of the cell.

Choices

Choice (4) Response

a.

4 Ω

b.

5 Ω

c.

2 Ω

d.

1 Ω

Question number: 4 (2 of 2 Based on Passage) Show Passage

» Current Electricity » Potentiometer

MCQ▾

Question

Find the new position of the balance point when 5 Ω resistances is replaced by 4 Ω resistors.

Choices

Choice (4) Response

a.

52 cm

b.

67.2 cm

c.

83.3 cm

d.

26.5 cm

Question number: 5

» Current Electricity » Potentiometer

MCQ▾

Question

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.

0.1 Ω

b.

1 Ω

c.

0.5 Ω

d.

2 Ω

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