List of practice Questions

The electrophile involved in the sulphonation of Benzene is

The dimensions of specific resistance are

The correct order of stability of the superoxides is

Stoma opens, when

Bryophytes resemble algae in the following aspects

What is/are true about heart wood?

An animal,-which has both exoskeletal and endoskeletal structures is a

Identify the group, which includes animals all of which give birth to young ones directly?

The chemical substances found most abundantly in the middle lamella are released into the phragmoplast by

The area of the region bounded by the parabola $(y-2)^2=x-1$ , the tangent to the parabola at the point $(2, 3)$ and the $x$-axis is

The alkene that exhibits geometrical isomerism is

The acidic nature of carboxylic acids $RCOOH \longrightarrow RCOO ^{-}+ H ^{+}$is due to

The abbreviation BOD stands for

The abbreviation "Bt" in "Bt" toxin stands for

$t_{1 / 2}$ for a first order reaction is $10\, \min$. Starting with $10\, M$, the rate after $20\, \min$ is

Suitable impurities are added to a semiconductor depending on its use. This is done to

Sulphonation of phenol with conc. $H _{2} SO _{4}$ at $288-293\, K$ gives

Stomata of CAM plants

: The variance of first $n$ even natural numbers is $\frac{n^{2}-1}{4}$ : The sum of first $n$ natural numbers is $\frac{n\left(n+1\right)}{2}$ and the sum of squares of first $n$ natural numbers is $\frac{n\left(n+1\right)\left(2n+1\right)}{6}$

$ \sin \,\,{{47}^{o}}+\sin {{61}^{o}}-\sin {{11}^{o}}-\sin {{25}^{o}} $ is equal to

Seeds of which plants is commonly called "black pearl"

Respiration is controlled by

Reciprocal of impedance is

Pyramid of energy in aquatic ecosystem is

Primitive nervous system is formed in