Experimental Skills (NEET Physics): Questions 36 - 39 of 66

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Question number: 36

» Experimental Skills » Focal Length

MCQ▾

Question

For a convex spherical mirror, the graph of (1v) verses (1u) is,

Choices

Choice (4) Response

a.

The graph of inverse of v Vs. inverse of u Choice -A

The Graph of Inverse of v vs. Inverse of U Choice -A

For a convex spherical mirror, the graph of v Vs. inverse of u is shown in figure.

b.

The graph of inverse of v vs. inverse of u Choice-B

The Graph of Inverse of v vs. Inverse of U Choice-B

For a convex spherical mirror, the graph of inverse of v vs. inverse of u is shown in figure.

c.

 The graph of inverse of v Vs. inverse of u Choice-C

the Graph of Inverse of v vs. Inverse of U Choice-C

For a convex spherical mirror, the graph of inverse of v Vs. inverse of u is shown in figure.

d.

 The graph of inverse of v Vs. inverse of u Choice-D

the Graph of Inverse of v vs. Inverse of U Choice-D

For a convex spherical mirror, the graph of inverse of v Vs. inverse of u is shown in figure.

Question number: 37

» Experimental Skills » Potentiometer

MCQ▾

Question

Two potentiometers A and B having 4 wires and 10 wires, each having 100 cm in length are used to compare e. m. f. of 2 cells. Which one will give a larger balancing length?

Choices

Choice (4) Response

a.

Potentiometer A

b.

Balancing length doesn’t depend on the total length of the wire.

c.

Potentiometer B

d.

A and B will give same balancing length

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: 38 (1 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: 39 (2 of 2 Based on Passage) Show Passage

» Experimental Skills » Resistivity of the Material

MCQ▾

Question

∆V measured between B and C is,

Choices

Choice (4) Response

a.

ρI2π(ab)

b.

ρIπaρIπ(a+b)

c.

ρI2πaρI2π(a+b)

d.

ρIaρIa+b

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