KVPY Stream-SA (Class 11) Physics: Questions 22 - 24 of 242

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 242 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 200.00 or

Question number: 22

» Current Electricity » Electrical Resistance

Short Answer Question▾

Write in Short

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

Circuit diagrams P and Q

Circuit Diagrams P and Q

In figure two circuit diagrams P and Q are shown. In circuit P voltmeter is use to measuring voltage across only R, and in circuit Q voltmeter use for measuring voltage across R and Ammeter.

In each case, the resistance is estimated by using Ohm’s law Rest=VI , 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

» Current Electricity » Electrical Resistance

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

» Ray Optics » Deviation and Dispersion of Light by a Prism

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

Sign In