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Kinematics -Dr. H. Malhotra
The Rigid Body. A body in which the distance between any two points does not change due to the application of external forces is called a rigid body (figure 1).

Motion of a Rigid Body. Various types of motions of a rigid body can be grouped mainly into three categories viz. Translation, fixed axis rotation and the general plane motion (more...)

Solid State -Mr. Sanjay Sharma
 CBSE Boards Question Bank coming soon!!
In an ionic crystal of A+B- type, if equal no. of cations and anions are missing from their lattice sites, the defect is called SCHOTTKY DEFECT. In this defect electrical neutrality is maintained due to disappearence of similar no. of cations and anions (Lattice Vacancy). (more...)

 
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Selected Questions & Answers
given:a+b+c=180; tan{(a+b-c)/4}tan{(b+c-a)/4}tan{(a+c-b)/4}=1 RTP-1+cosa+cosb+cosc= 0   Asked by yoganda
Answer: The technique used in this solution is called, method of universal substitution, x=tan (x/2) is the universal subtitution we are tallking abt. using this substitution, many complicated trignometric problems can be converted to more.. (Answered by bvsatyaram)
Anupamagrawal13a on Important Boards Chemistry Ques
Q. 1. H2O is a liquid while H2S is a gas.
Q. 2. HF is a weak acid than HI although F is more electronegative than I.
Q. 3. Nitrogen does not form NCl5 but P forms PCl5.
Q. 4. Give example of a compound in which OS of Chlorine is +7.
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Q. 6. Which compound led to the discovery of noble more
Top Book review - contributed by SMARTY
Hey everyone! I'm in Class 12 & I think Irodov is a very good book if you want to strengthen your physics concepts & improve your problem-solving skills ... Though the book has some really tough problems, in my opinion, a class 11 student should be able to solve most of it .. don't be discouraged, though.  more
       
goIIT Free Questions of the Day

Physics

Multiple Choice Question with Two or More Choices Correct
The cyclotron frequency of a particle in a magnetic field is independent of
(a) the mass of the particle
(b) the charge of the particle
(c) the speed of the particle
(d) the radius of the circular path of the particle

Chemistry

Fill in the Blank :
The Natta catalyst is .......... .

Mathematics

A pair of fair dice is rolled together till a sum of either 5 or 7 is obtained. The probability that 5 comes before 7 is .............. .
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