Vandana said on June 19th, 2009

that was good...thank you!

Anonymous said on June 22nd, 2009

that was good...thank you!

quba said on June 25th, 2009

Hi,

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Anonymous said on August 21st, 2009

good one...good job...keep it up...

Anonymous said on June 2nd, 2010

Thank you v much..

sandeep kumar majhi said on November 22nd, 2011

very nice collection thank you

sandeep (odisha) said on November 22nd, 2011

very good quiz

shubham said on January 19th, 2013

Q 12: critical angle is the angle of incidence above which total internal reflection occurs

Brijesh said on April 2nd, 2013

What a useful information provided by you....It's really helpful for the competitive exams.

Keep it up..!!

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