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Asked by Chayanika Guin

Nov 16, 2013

#### what is the derivation of mirror formula of concave and convex mirror?



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Jun 24, 2014

#### An electric bulb is rated 220V and 100W. when it is operated on 110V, what will be the power consumed?



P = V2/R
If V = 220 V we have

100 W = 2202

Asked by Nidhi Maithani

Dec 3, 2014

#### What is the difference between a virtual image and a real image?



real image is formed when the light rays really meet, whereas virtual image is formed when the light rays appear to meet.

Jan 19, 2014

#### uses of convex lens in daily life.,.



It is converging lens . Used in magnifying g...

May 17, 2014

#### Why should curd and sour substances not be kept in brass and copper vessels?



sour substances are cidic in nature,i.e, they have acids in them. So, when they are kept in brass or copper vessels, they react...

Asked by Sudharsan s

May 7, 2015

#### What is the difference between resistance and resistivity of a conducter? Please Explain?



1.  Resistance of a conductor is the obstruction offered by the conductor in the flow of current throu...

Feb 26, 2014

#### write the similarities between dobereiner's triads and newland's law of octaves?write the change in modern periodic table as we go from left to right and top to bottom in context to -(1)valency electrons(2)valency(3)electronegativity (4)metallic character(5)electron affinity(6)atomic sizealso explain how?



Uses:
ï¿½i) ï¿½ Atomic weights of elements were determined with the help of periodic table
Atomic weight = Valency Â´ Equivalent weight = Group number Â´ Equivalent weight.
...

Asked by Prateek Jain

Jul 9, 2015

#### I want all the formulas used in chapter electricity



The formulas used in class X are-
1- I,current=Q,charge/T,time
2- V,potential differnce=W,work done/Q,charge
3-V,potential difference=I,cureent*R,resistance
4-Resisitivity=(R,resista...

Asked by Nikhil Sikka

Jun 13, 2014

#### what is rancidity ? write different methods of preventing rancidity .



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Asked by Anuj A

Mar 1, 2015

#### Difference between mendeleevs periodic table & mordern periodic table



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