Current Electricity (NEET Physics): Questions 17 - 20 of 75

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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: 17 (1 of 3 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: 18 (2 of 3 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: 19 (3 of 3 Based on Passage) Show Passage

» Current Electricity » Series and Parallel Combinations of Resistors

MCQ▾

Question

How can we change a galvanometer with R g = 20.0 Ω and I g = 0.00100 A into a voltmeter with a maximum range of 10.0 V?

Choices

Choice (4) Response

a.

By adding a resistance 8890 Ω in series with the galvanometer

b.

By adding a resistance 8890 Ω in parallel with the galvanometer

c.

By adding a resistance 9980 Ω . in parallel with the galvanometer

d.

By adding a resistance 9980 Ω in series with the galvanometer

Question number: 20

» Current Electricity » Wheatstone Bridge

MCQ▾

Question

Figure shows a balanced Wheatstone’s bridge. Which of the following sentences are correct for this figure?

Wheatstone bridge Circuit diagram

Wheatstone Bridge Circuit Diagram

Figure shows the balanced Wheatstone bridge. P, Q, R and S are resistors of this bridge.

(1) If P is slightly increased, the current in the galvanometer flows from A to C.

(2) If P is slightly increased, the current in the galvanometer flows from C to A.

(3) If Q is slightly increased, the current in the galvanometer flows from C to A.

(4) If Q is slightly increased, the current in the galvanometer flows from A to C.

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1 and 3

b.

1 and 2

c.

1, 2 and 3

d.

2 and 4

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