NEET Physics: Questions 1807 - 1811 of 2099

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Passage

Read the passage given below and answer the questions that follow:

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

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

» Experimental Skills » Resistivity of the Material

MCQ▾

Question

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

Choices

Choice (4) Response
a.

ρI4πr2

b.

ρI8πr2

c.

ρIr2

d.

ρI2πr2

Question number: 1808

» Experimental Skills » Potentiometer

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.

Voltmeter

c.

Ammeter

d.

Galvanometer

Question number: 1809

» Experimental Skills » Ohm's Law

MCQ▾

Question

Which two circuit components are connected in parallel in the following circuit diagram?

Circuit diagram consists of ammeter

Circuit Diagram Consists of Ammeter

In given circuit, resistor, rheostat, key, ammeter, battery are connected in series.

Choices

Choice (4) Response
a.

Ammeter and resistor

b.

Voltmeter and ammeter

c.

Rheostat and voltmeter

d.

Voltmeter and resistor

Question number: 1810

» Communication System » Basic Elements of Communication System

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

» Oscillations and Waves » Standing Waves in Strings and Organ Pipes

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.

n=3,f2=34f1

b.

n=5,f2=54f1

c.

n=5,f2=34f1

d.

n=3,f2=54f1

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