Experimental Skills (NEET Physics): Questions 39 - 42 of 66

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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: 39 (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: 40

» 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: 41

» 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: 42

» Experimental Skills » Multimeter

MCQ▾

Question

Circuit diagram consists of voltmeter, ammeter, battery.

Circuit Diagram Consists of Voltmeter, Ammeter, Battery.

In figure circuit diagram consists of voltmeter, ammeter, battery and resistors is shown.

In the circuit shown, voltmeter is ideal and its least count is 0.1 V. The least count of ammeter is 1 mA. Let reading of the voltmeter is 30.0 V and the reading of ammeter is 0.020 A. Calculate the value of resistance R within error limits.

Choices

Choice (4) Response

a.

(1.2±0.05)kΩ

b.

(1.5±0.08)kΩ

c.

(1.5±0.05)kΩ

d.

(1.2±0.08)kΩ

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