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What people are asking?

Asked by Chayanika Guin

Nov 16, 2013

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

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Answer (6)

Asked by Sabu

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

Answer (2)

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.

Answer (15)

Asked by Unmukt

Jan 19, 2014

uses of convex lens in daily life.,.

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

Answer (6)

Asked by Manikanth

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...

Answer (10)

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...

Answer (4)

Asked by Ayushman

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



(4)metallic character

(5)electron affinity

(6)atomic size

also explain how?

�i) � Atomic weights of elements were determined with the help of periodic table
Atomic weight = Valency ´ Equivalent weight = Group number ´ Equivalent weight.

Answer (8)

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

Answer (2)

Asked by Raj

Apr 8, 2015

How to blance an equation ?

(i) Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride

barium chloride + aluminium sulphate -------...

Answer (5)

Asked by Nikhil Sikka

Jun 13, 2014

what is rancidity ? write different methods of preventing rancidity .

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Answer (2)