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Question: aaa aaa aaa aaa aaa NCERT Single Correct Question of JEE Main from Physics Unit and Dimention chapter.NCERT aaaCorrect Option: 2 Solution: aaa...
Read More →Give reasons :
[question] Question. Give reasons : (a) A gas fills completely the vessel in which it is kept. (b) A gas exerts pressure on the walls of the container. (c) A wooden table should be called a solid. (d) We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert. [/question] [solution] Solution: (a) The molecules of gas have high kinetic energy due to which they keep moving in all directions and hence fill the vessel completely in which they are kept...
Read More →A right triangle $A B C$ with sides $5 \mathrm{~cm}$,
[question] Question. A right triangle $A B C$ with sides $5 \mathrm{~cm}, 12 \mathrm{~cm}$ and $13 \mathrm{~cm}$ is revolved about the side $12 \mathrm{~cm}$. Find the volume of the solid so obtained. [/question] [solution] Solution: When right-angled $\triangle \mathrm{ABC}$ is revolved about its side $12 \mathrm{~cm}$, a cone with height $(h)$ as $12 \mathrm{~cm}$, radius $(r)$ as $5 \mathrm{~cm}$, and slant height $(l) 13 \mathrm{~cm}$ will be formed. Volume of cone $=\frac{1}{3} \pi r^{2} h$...
Read More →Identify the substances that are oxidised and
[question] Question. Identify the substances that are oxidised and the substances that are reduced in the following reactions. (i) $4 \mathrm{Na}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{Na}_{2} \mathrm{O}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g})$ (ii) $\mathrm{CuO}(\mathrm{s})+\mathrm{H}_{2}(\mathrm{~g}) \rightarrow \mathrm{Cu}(\mathrm{s})+\mathrm{H}_{2} \mathrm{O}(\ell)$ [/question] [solution] solution: (i) Sodium (Na) is oxidised as it gains oxygen and oxygen gets reduced....
Read More →(a) Tabulate the differences in the characteristics of states of matter.
[question] Question. (a) Tabulate the differences in the characteristics of states of matter. (b) Comment upon the following: rigidity, compressibility, fluidity, fliling a gas container, shape, kinetic energy and density. [/question] [solution] Solution (a) Difference in the characteristics of 3 states of matter (b) Comment on: (i) Rigidity. The tendency of a substance to retain/maintain their shape when subjected to outside force. (ii) Compressibility: The matter has intermolecular space. The ...
Read More →Give an example of a double displacement reaction other than the one given in Activity 1.10.
[question] Question. Give an example of a double displacement reaction other than the one given in Activity 1.10. [/question] [solution] solution: Sodium carbonate reacts with calcium chloride to form calcium carbonate and sodium chloride. In this reaction, sodium carbonate and calcium chloride exchange ions to form two new compounds. Hence, it is a double displacement reaction. [/solution]...
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