List of practice Questions

Two coherent monochromatic light beams of intensities ratio 1 : 4 are superposed. The ratio of maximum and minimum intensities in the resulting beam will be

Lenz?s law is consequence of the law of conservation of

Kelvin equation is related to

0.2 moles of an ideal gas is taken round the cycle ABC as shown in the figure. The path B ? C is an adiabatic process, A ? B is an isochoric process and C ? A is an isobaric process. The temerature at A and B are TA = 300 K and TB = 500 K and pressure at A is 1 atm and volume at A is 4.9 L. The volume at C is (Given : $\gamma=\frac{Cp}{C_{V}}=\frac{5}{3}, R = 8.205 ? 10^{-2}$ L atm mol$^{-1}$ $K^{-1}, \left(\frac{3}{2}\right)^{^{2/5}} =0.81$

The given combination will work as:

Among the following choose the correct epimers:

A mass $m$ is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break when:

\(\:\xrightarrow[\Delta]{DIBAL-H}\:\) Product, Product is :

There are 7 greetings cards, each of a different colour and 7 envelopes of same 7 colours as that of the cards. The number of ways in which the cards can be put in envelopes, so that exactly 4 of the cards go into envelopes of respective colour is,

The velocity of sound waves in a medium does not depend on

The total energy of an electron in an atom in an orbit is $-3.4\,eV$ . Its kinetic and potential energies arc, respectively:

The $Q$ factor for a damped oscillator is given by the

The frequency of an alternating current is 50 Hz. What is the minimum time taken by current to reach its peak value from rms value?

Skeletal muscles are controlled by -

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?