# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics: Questions 22 - 24 of 253

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## Question number: 22

Short Answer Question▾

### Write in Short

Consider the two circuits P and Q, shown below, which are used 20 measure the unknown resistance R.

In each case, the resistance is estimated by using Ohm’s law , Where V and I are the readings of the voltmeters and the ammeters respectively. The internal resistances of voltmeter and ammeter are R V and R A, such that R A < < R < < R V.

The internal resistance of the battery may be ignored. The absolute error in the estimate of the resistance is denoted by δ R =| R - Rest| .

(a) Express δ R P in terms of the given resistance values

(b) Express δ R Q in terms of the given resistance values

(c) For what value of R will δ R P ≈ δ R Q

## Question number: 23

Appeared in Year: 2011

MCQ▾

### Question

A cylindrical copper rod has length L and resistance R. If it is melted and formed into another rod of length 2L, than the resistance will be

### Choices

Choice (4) Response

a.

8R

b.

R

c.

4R

d.

2R

## Question number: 24

Appeared in Year: 2010

MCQ▾

### Question

White light is split into a spectrum by a prism and it is seen on a screen. If we put another identical inverted prism behind it in contact, what will be seen on the screen?

### Choices

Choice (4) Response

a.

There will be no spectrum, but only the original light with no deviation

b.

The spectrum will remain the same

c.

There will be no spectrum, but the original light will be largely displaced

d.

Violet will appear where red was

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