List of top Questions asked in LPUNEST

The enthalpy of vaporization of a liquid is \(30\,\text{kJ mol}^{-1}\) and entropy of vaporization is \(75\,\text{J K}^{-1}\text{ mol}^{-1}\). The boiling point of the liquid at \(1\,\text{atm}\) is
The solubility of \(N_2(g)\) in water exposed to the atmosphere, when the partial pressure is \(593\,\text{mm}\), is \(5.3 \times 10^{-4}\,\text{M}\). Its solubility at \(760\,\text{mm}\) and at the same temperature is
The degree of dissociation \(\alpha\) of the reaction \(N_2O_4(g) \rightleftharpoons 2NO_2(g)\) can be related to \(K_p\) as
\(MnO_4^- + Br^- + H_2O \rightarrow MnO_2 + BrO_3^- + OH^-\). In the balanced reaction, the coefficients of \(MnO_4^-\), \(BrO_3^-\) and \(OH^-\) are respectively:
The half-life of a first order chemical reaction is \(60\) hrs at \(300\,\text{K}\). As temperature is increased to \(310\,\text{K}\), half-life becomes \(40\) hrs. Determine the half-life of the same reaction at \(350\,\text{K}\).
According to Freundlich adsorption isotherm, which of the following is correct?
\(122.4\,\text{L}\) of \(O_2\) at STP has same mass as
For the following question, enter the correct numerical value up to TWO decimal places. If the numerical value has more than two decimal places, round-off the value to TWO decimal places. (For example: Numerical value 5 will be written as 5.00 and 2.346 will be written as 2.35) An elevator and its load have a total mass of 800 kg. If the elevator, originally moving downward at \(10\,\text{m s}^{-1}\), is brought to rest with constant deceleration in a distance of 25 m, the tension in the supporting cable will be _____ N. (Take \( g = 10\,\text{m s}^{-2} \))
For the following question, enter the correct numerical value up to TWO decimal places. If the numerical value has more than two decimal places, round-off the value to TWO decimal places. (For example: Numerical value 5 will be written as 5.00 and 2.346 will be written as 2.35) A mass of 50 kg is raised through a certain height by a machine whose efficiency is 90%, the energy spent is 5000 J. If the mass is now released, its KE on hitting the ground shall be _____ J
For the following question, enter the correct numerical value up to TWO decimal places. If the numerical value has more than two decimal places, round-off the value to TWO decimal places. (For example: Numerical value 5 will be written as 5.00 and 2.346 will be written as 2.35) Number of significant figures in \( (3.20 + 4.80)\times 10^5 \) is _____
After rounding \(1.245\) and \(1.235\) to three significant figures, we will have their answers respectively as
A manifestation of surface tension is:
In hydrogen atom, energy of electron in ground state is \(13.6\,\text{eV}\), then energy of electron in second excited state is
Octet rule is not followed in
A particle at rest on a frictionless table is acted upon by a horizontal force which is constant in magnitude and direction. A graph is plotted for the work done on the particle \(W\) against the speed of the particle \(v\). If there are no frictional forces acting on the particle, the graph will look like:
A uniform rod of length \(L\) and mass \(3m\) is held vertically hinged at its base. A mass \(m\) moving horizontally with velocity \(v\) strikes the rod at the top and sticks to it. The angular velocity with which the rod hits the ground is:
Moment of inertia of a thin rod of mass \(M\) and length \(L\) about an axis passing through its centre is \(\dfrac{ML^2}{12}\). Its moment of inertia about a parallel axis at a distance of \(\dfrac{L}{4}\) from this axis is given by:
In the relation \(y = r\sin(\omega t - kx)\), the dimensional formula of \(\dfrac{\omega}{k}\) is:
A juggler maintains four balls in motion making each of them to rise a height of 20 m from his hand. What time interval should be maintained for the proper distance between them?
For the following question, enter the correct numerical value up to TWO decimal places. If the numerical value has more than two decimal places, round-off the value to TWO decimal places. (For example: Numerical value 5 will be written as 5.00 and 2.346 will be written as 2.35) A mass of 3 kg descending vertically downwards supports a mass of 2 kg by means of a light string passing over a pulley. At the end of 5 s the string breaks. How much high from now the 2 kg mass will go? _____ m
For the following question, enter the correct numerical value up to TWO decimal places. If the numerical value has more than two decimal places, round-off the value to TWO decimal places. (For example: Numerical value 5 will be written as 5.00 and 2.346 will be written as 2.35) A particle is thrown with velocity \( u \) making angle \( \theta \) with vertical. It just crosses the top of two poles each of height \( h \) after 1 s and 3 s respectively. The maximum height of the projectile is _____
Acceleration (\(a\)) – displacement (\(s\)) graph of a particle moving in a straight line is as shown in the figure. The initial velocity of the particle is zero. The \(v\)-\(s\) graph of the particle would be:
If $\vec A + \vec B + \vec C = 0$, then $\vec A \times \vec B$ is equal to:
A particle is released from a height \(H\). At a certain height its kinetic energy is two times its potential energy. Height and speed of the particle at that instant are:
A ladder of length \(l\) and mass \(m\) is placed against a smooth vertical wall, but the ground is rough. The coefficient of friction between the ground and the ladder is \(\mu\). The angle \(\theta\) at which the ladder will stay in equilibrium is: