List of practice Questions

Select the correct statement regarding shapes of $PCl_5, BrF_5$ and $IF_7$.

One mole of $O_2$ gas is heated at constant pressure starting at $27^o$C. How much energy must be added to the gas as heat to double its volume?

Number of ways of forming a committee of $6$ members out of $5$ Indians, $5$ Americans and $5$ Australians such that there will be atleast one member from each country in the committee is

Myosin head separates from actin when :

Most common isotope of hydrogen (Non radioactive):

Magnesium is burnt in air to form $A$ and $B$. When $B$ is hydrolysed, $C$ and $D$ are formed. $D$ is the reactant in the manufacture of nitric acid by Ostwald's process. What is $C$

Let $f(x) = x^2 + 2x + 2, g(x) = - x^2 + 2x - 1 $ and $a, b$ be the extreme values of $f(x), g(x)$ respectively. If $c$ is the extreme value of $\frac{f}{g} (x)$ (for x $\neq$ 1), then $a + 2b + 5c + 4$ =

Length of the spinal cord in humans is:

Kwashiorkor disease is due to :-

In Ti-plasmid, which of the following is removed:

Let $x \, \in \, R$ and let $P = \begin{bmatrix}1&1&1\\ 0&2&2\\ 0&0&3\end{bmatrix},\quad Q = \begin{bmatrix}2&x&x\\ 0&4&0\\ x&x&6\end{bmatrix}$ and $R = PQP^{-1}$. Then which of the following options is/are correct?

Find force per unit length at P.

Energy of electron (in eV) in 2nd orbit of He ion ?

Correct order of basic strength is :

Choose the correct option

Chimeric DNA is

Calculate the mean % error in five observations : 80.0, 80.5, 81.0, 81.5, 82

Calculate emf of cell at 25?C Cell notation $M\left|M^{2+}_{0.01}\right|\left|M^{2+}_{0.00001}\right|M$ If value of E is 4 volt (Given $\frac{RT}{F}$ in 10 = 0.06)

Virus free plants can be generated through

A variable line passes through the fixed point ($\alpha,\,\beta$). The locus of the foot of the perpendicular from the origin on the line is,

A square conducting loop is placed near an infinitely long current carrying wire with one edge parallel to the wire as shown in the figure. If the current in the straight wire is suddently halved, which of the following statements will be true? "The loop will ....... "

A sphere and a cube of same material and same volume are heated upto same temperature and allowed to cool in the same surroundings. The ratio of the amounts of radiations emitted will be

A proton and an $\alpha$-particle are simultaneously projected in opposite directions into a region of uniform magnetic field of $2\, mT$ perpendicular to the direction of the field. After some time it is found that the velocity of proton has changed in direction by $90^{\circ}$. Then at this tune, the angle between the velocity vectors of proton and $\alpha$ - particle is

What will be the DNA content and number of chromosomes in a cell, after S phase as compared to the gamete of the same organisms?

Which of the following is similar in DNA of elephant and mango tree?