List of top Questions asked in NEET (UG)

A source of unknown frequency gives 4 beats/s, when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz. The unknown frequency is
Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is 7. Now the strings are rigidly clamped at half the height. The equilibrium separation between the balls now become
The wavelength $λ_e$ of an electron and $λ_p$ of a photon of same energy E are related by
What is the activation energy for a reaction if its rate doubles when the temperature is raised from 20°C to 35°C ? (R = 8.314 J mol-1 K-1)
A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be
Which of the following lanthanoid ions is diamagnetic ?
(At. nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)
KMnO4 can be prepared from K2MnO4 as per the reaction:
\(3MnO^{2-}_4+2H_2O⇌2MnO^-_4+MnO_2+4OH^-\)
The reaction can go to completion by removing OH- ions by adding
A gas is taken through the cycle A⇢B⇢C⇢A ,as shown. What is the net work done by the gas?
Nylon is an example of
6.02 × 1020 molecules of urea are present in 100 mL of its solution. The concentration of solution is
A body of mass w taken from the earth's surface to the height equal to twice the radius (R) of the earth. The change in potential energy of body will be
The condition under which a microwave oven heats up a food item containing water molecules most efficiently is
For a normal eye, the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behind the comes is 20 D. Using this information, the distance between the retina and the comea-eye lens can be estimated to be
At 25°C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm-1 cm2 mol-1 and at infinite dilution its molar conductance is 238 ohm-1 cm2 mol-1. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is
In an experiment four quantities a, b, c and d are measured with percentage error 1%, 2%, 3% and 4% respectively. Quantity P is calculated as follows: P= $\frac{a^3 b^2}{cd}$ % error in P is
In Young's double slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths, $λ_1$ =12000 Å and $λ_2$= 10000 Å. At what minimum distance from the common central bright fringe on the screen 2 m from the slit will a bright fringe from one interference patter coincide with a bright fringe from the other?
Which is the strongest acid in the following ?
Which of these is not a monomer for a high molecular mass silicone polymer ?
Nitrobenzene on reaction with conc. HNO3/H2SO4 at 80-100°C forms which one of the following products ?
Which is the monomer of Neoprene in the following ?
A uniform force of $(3\hat{i}+\hat{j}) $newton acts on a particle of mass 2 kg. Hence the particle is displaced from position $(2\hat{i}+\hat{k})$ metre to position $(4\hat{i}+3\hat{j}-\hat{k})$ metre. The work done by the force on the particle is
Meiosis takes place in
The foetal ejection reflex in humans triggers the release of
The reddish appearance of the sun at sunrise and sunset is due to
Interfascicular cambium develops from the cells of