List of top Questions asked in DUET

In the reaction given below, $X $ is $C_6H_5MgBr + CH_3OH \longrightarrow X$
Raindrops are falling from a certain height. Assume all raindrops are spherical and have same drag coefficient. The impact speed of large raindrops compared to that of small raindrops is
A boat crosses a river from port $A$ to port $B$, which are just on the opposite sides. The speed of the water is $v_{W}$ and that of boat is $Vg$ relative to water. Assume $v_{B}=2 v_{W}$. What is the time taken by the boat, if it has to cross the river directly on the $A B$ line?
The radius of an electron orbit in a hydrogen atom is of the order of
Which of following mineral-nutrients plays an important role in biological nitrogen fixation?
The lock and key model of enzyme action illustrates that a particular enzyme molecule
The effectiveness of an enzyme is affected least by
Somaclones are obtained by
Recombination is involved in the process of
Niche is defined as the
Lime is added to the soil which is too
Largest single mass of lymphatic tissue in the body is
It is believed that atoms combine with each other such that the outermost shell acquires a stable configuration of $8$ electrons. If stability were attained with $6$ electrons rather than $8$; what would be the formula of the stable fluoride ion?
In higher plants, the shape of the chloroplast is
In the change of $NO \, \to\, NO^+$ the electron is added to
For what distance is ray optics a good approximation when the aperture is $4 \,mm$ wide and the wavelength is $500 \,nm$?
Endoplasmic reticulum is in continuation with :
Deserts, grasslands, forests and tundra are the examples of
Diploid cells have
Electroporation Procedure involves
Which of the following reactions will not result in the formation of carbon-carbon bonds ?
The value of electronegativity of /atoms $A$ and $B$ are $1.2$ and $4.0$ respectively. The $\%$ ionic character of the $A - B$ bond is
Aldol condensation does not occur between
The current (in ampere) drawn from a $12 \,V$ supply by the infinite network shown in the following figure is
Top of the stratosphere has an electric field $E$ (in units of $ Vm^{-1} $ ) nearly equal to