# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1807 - 1811 of 2184

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## Passage

Consider a block of conducting material of resistivity ′ ρ ′ shown in the figure. Current I enter at ‘A’ and leaves from ‘D’. We apply superposition principle to find voltage ∆ V’ developed between ‘B’ and ‘C’. The calculation is done in the following steps:

(i) Take current T entering from ‘A’ and assume it to spread over a hemispherical surface in the block A Block of Conducting Material In figure a block of conducting material of resistivity ρ shown in figure. Current I enter at A and leaves from D.

(ii) Calculate field E (r) at distance ‘r’ from A by using Ohm’s law E = ρ j, where j is the current per unit area at ‘r’.

(iii) From the V dependence of E (r), obtain the potential V (r) at r.

(iv) Repeat (i), (ii) and (iii) for current

## Question number: 1807 (2 of 2 Based on Passage) Show Passage

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MCQ▾

### Question

For current entering at A, the electric field at a distance ‘r’ from A is

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1808

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MCQ▾

### Question

Which device is used to measure the potential difference between two points of a conductor in the laboratory?

### Choices

Choice (4) Response

a.

Potentiometer

b.

Galvanometer

c.

Voltmeter

d.

Ammeter

## Question number: 1809

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MCQ▾

### Question

Which two circuit components are connected in parallel in the following circuit diagram? Circuit Diagram Consists of Ammeter In given circuit, resistor, rheostat, key, ammeter, battery are connected in series.

### Choices

Choice (4) Response

a.

Voltmeter and resistor

b.

Ammeter and resistor

c.

Rheostat and voltmeter

d.

Voltmeter and ammeter

## Question number: 1810

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MCQ▾

### Question

A laser beam is used for carrying out surgery because it

### Choices

Choice (4) Response

a.

Is highly directional

b.

Is highly monochromatic

c.

Can be sharply focused

d.

Is highly coherent

## Question number: 1811

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MCQ▾

### Question

An open organ pipe is in resonance in its 2 nd harmonic with tuning fork of frequency f 1 now; it is closed at one end. If the frequency of the tuning fork is increased slowly from f l then again a resonance is obtained with a frequency f 2. If in this case the pipe vibrates n th harmonics then

### Choices

Choice (4) Response

a.

b.

c.

d.