ICSE − Q & A

characteristics of image formed by collimator of spectrometer?

A prism causes dispersion of white light whereas a rectangular glass block does not. Why?

Guys what do we have to write in safe limit of sound?

Coz in the Selina it  is given 0-80db
But in 2017 paper pupils analysis it is given not more than 120 db.

+ 1 more questions by pratham2313  

Explain why it appears that energy released in fusion is less than fission, but it is not so.
asked by Pratham Shah (pratham2313) 6 years ago
1

what is the unite of ludness
in seline it is givenphon and it says the level of sound has a unit decibal so unit of loudness is phon or decibal

What is the length of nichrome wire of resistance 5.6 ohms, if the length of a similar wire is 80 cm  and its resistance is 4.2ohms

Pls check out page 194 question 15 .is it correct

Any good electricity numericals?

any economics students??

Why is soft iron core used in a D.C. Motor and an A.C. Generator?
Can it be because of soft iron's high magnetic permeability and low retentivity?

The power rating of an electric bulb is 40W 220 V. Find the power when the potential difference is reduced to 200V

--- My answer is approx. 33 W, is it right?