# Current Electricity (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 21 - 25 of 77

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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 –

### 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-

### Choices

Choice (4) Response

a.

r

b.

c.

d.

5r

f Page