# Experimental Skills (NEET Physics): Questions 36 - 39 of 67

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## Question number: 36

» Experimental Skills » Focal Length

MCQ▾

### Question

For a convex spherical mirror, the graph of verses is,

### Choices

Choice (4) Response

a.

b.

c.

d.

## 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

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

(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

∆V measured between B and C is,

### Choices

Choice (4) Response

a.

b.

c.

d.

## 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.

b.

c.

d.

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