NEET Physics: Questions 473 - 476 of 2098

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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: 473 (3 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: 474

» 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

Question number: 475

» Current Electricity » Metre Bridge

MCQ▾

Question

Two resistances are connected in two gaps of a meter bridge. The balance point is 20 cm from the zero ends. A resistance of 15 ohms is connected in series with the smaller of the two. The null point shifts to 40 cm. The value of the smaller resistance in ohm is

Choices

Choice (4) Response

a.

3

b.

12

c.

6

d.

9

Question number: 476

» Current Electricity » Electrical Resistance

MCQ▾

Question

The resultant resistance between the points A and B in the following figure will be –

network circuit of 1Ω and 2Ω resistors

Network Circuit of 1Ω and 2Ω Resistors

Here in above diagram 4 resistances connected in series and 4 resistances connected in parallel.

Choices

Choice (4) Response

a.

8 Ω

b.

2 Ω

c.

4 Ω

d.

6 Ω

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