Current Electricity (NEET Physics): Questions 21 - 25 of 75

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Question number: 21

» 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: 22

» 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

Question number: 23

» 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

Question number: 24

» Current Electricity » Potentiometer

MCQ▾

Question

A potentiometer consists of a wire of length 4 m and resistance 10 Ω. It is connected to cell of emf 2 V. The potential difference per unit length of the wire will be

Choices

Choice (4) Response

a.

2 V/m

b.

0.5 V/m

c.

10 V/m

d.

5 V/m

Question number: 25

» Current Electricity » Wheatstone Bridge

MCQ▾

Question

In the adjoining network of resistors, each is of resistance r ohm, the equivalent resistance between points A and B is-

Circuit Diagram with five equal resistors

Circuit Diagram With Five Equal Resistors

Figure shows the adjoining network of resistor r ohm.

Choices

Choice (4) Response

a.

r

b.

r2

c.

2r3

d.

5r

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