List of top Questions asked in JKCET

The value of $a$ for which the volume of parallelepiped formed by the vectors $\hat {i}+a\hat{j} + \hat{k} \,\, \hat{j}+a\hat{k} $ and $ a\hat{i}+\hat{k} $ is minimum, is
Dimension of universal gas constant $(R)$ is
The molecules in an ideal gas at $27^{\circ} C$ have a certain mean velocity. At what approximate temperature, will the mean velocity be doubled?
A nucleophilic substitution reaction proceeds through $S _{ N } 1$ mechanism. So, the reaction is
A uniform rod of length $L$ and mass $M$ is held vertical, with its bottom end pivoted to the floor. The rod falls under gravity, freely turning about the pivot. If acceleration due to gravity is $g$, what is the instantaneous angular speed of the rod when it makes an angle $60^{\circ}$ with the vertical?
The product of reaction between aniline and acetic anhydride is
What are the dimensions of electrical conductivity?
Which of the following optical phenomena is involved in the propagation of light in an optical fibre?
The correct order of electron gain enthalpy $ (\Delta _{eg}H) $ of the halogen atoms is
The $ C-H $ bond distance is the longest in
The power of a convex lens is $2 $ dioptre. Its power is to be reduced to $1.5$ dioptre, by putting another lens in combination with it. Which of the following lenses will serve the purpose?
Which of the following is false for interference of light?
Which of the following is a true statement?
The dissolution of a gas in a liquid is governed by
In television transmission what type of modulation is used ?
Let $A$ and $B$ be two mutually exclusive events such that $ P(A\cap {{B}^{c}})=0.25 $ and $ P({{A}^{c}}\cap B)=0.5 $ . Then, $ P\{(A\cup {{B}^{c}})\} $ is equal to
$2$ -bromobutane reacts with $OH ^{-}$ in $H _{2} O$ to give $2$ -butanol. The reaction involves
In a single-slit diffraction experiment, the width of the slit is reduced by half. Which of the following needs to be done if the width of the central maxima has to remain the same?
Glucose can be converted into ethyl alcohol using
The rate of reactions exhibiting negative activation energy
The correct order of increasing oxidizing power in the series is
A bar magnet is placed upright on a floor (so that the axis of the magnet is vertical). A copper ring is held above the magnet, with its plane horizontal and released. The copper ring falls in such a manner that its axis always coincides with that of the magnet. What will be the acceleration with which the ring will fall? Acceleration due to gravity is $ 10\,m/s^{2} $ .
Addition of a non-volatile solute in a volatile ideal solvent
Standard electrode potential of half-cell reactions are given below $C u^{2+}+2 e^{-} \rightarrow C u ; E^{\circ}=0.34\, V $ $Z n^{2+}+2 e^{-} \rightarrow Z n ; E^{\circ}=-0.76 \,V$ What is the emf of the cell?
A compound with nitro group was reduced by $Sn / HCl$, followed by treatment with $NaNO _{2} / HCl$ and followed by phenol. The chromophore group in the final compound is