List of top Questions asked in NEET (UG)

Given below are two statements:
Statement I: In Lucas test, primary, secondary and tertiary alcohols are distinguished on the basis of their reactivity with conc. HCl +ZnCl2, knowns as Lucas Reagent.
Statement II: Primary alcohols are most reactive and immediately produce turbidity at room temperature on reaction with Lucas Reagent.
In the light of the above statements, choose the most appropriate answer from the options given below:

The pollution due to oxides of sulphur gets enhanced due to the presence of:

  1. Particulate matter
  2. Ozone
  3. Hydrocarbons
  4. Hydrogen peroxide.

Choose the most appropriate answer from the options given below:

Copper crystallises in fcc unit cell with cell edge length of 3.608 x 10-8 cm. The density of copper is 8.92 g cm-3. Calculate the atomic mass of copper

Amongst the following which one will have maximum 'lone pair- lone pair' electron repulsions?

3O2 (g) ⇌ 2O3(g) for the above reaction at 298 K, Kc is found to be 3.0 x 10-59. If the conc. of O2 at equilibrium is 0.040 M then concentration of O3 in M is

Match List - I with List- II. Choose the correct answer from the options given below:

 List - I (Hydrides) List - II (Nature)
(a)MgH2(i)Electron precise
(b)GrH4(ii)Electron deficient
(c)B2H6(iii)Electron rich
(d)HF(iv)Ionic
At 298 K, the standard electrode potentials of Cu2+/Cu, Zn2+/Zn, Fe2+/Fe and Ag+/Ag are 0.34 V, - 0.76 V, - 0.44 V and 0.80 V, respectively.
On the basis of standard electrode potential, predict which of the following reaction cannot occur?

Statement I: In the coagulation of a negative sol, the flocculating power of the three given ions is in the order - Al3+ > Ba2+ > Na+
Statement II: In the coagulation of a positive sol, the flocculating power of the three given salts is in the order - NaCl > Na2SO4 > Na3PO4
Choose the most appropriate answer from the options given below:

Match List - I with List- II.

 List-I (Drug class) List-II (Drug molecule)
(a)Antacids(i)Salvarsan
(b)Antihistamines(ii)Morphine
(c)Analgesics(iii)Cimetidine
(d)Antimicrobials(iv)Seldane
Identify the incorrect statement from the following.
The incorrect statement regarding chirality is:
Two objects of mass 10 kg and 20 kg respectively are connected to the two ends of a rigid rod of length 10 m with negligible mass. The distance of the center of mass of the system from the 10 kg mass is:
Two objects of mass 10 kg and 20 kg
The graph which shows the variation of the de Broglie wavelength (λ) of a particle and its associated momentum (p) is
Two point charges -q and +q are placed at a distance of L, as shown in the figure.
Two point charges -q and +q
The magnitude of electric field intensity at a distance R (R>>L) varies as:
Let \(T_1\) and \(T_2\) be the energy of an electron in the first and second excited states of the hydrogen atom, respectively. According to Bohr’s model of an atom; the ratio T1:T2 is:
An ideal gas undergoes four different processes from the same initial state as shown in the figure below. Those processes are adiabatic, isothermal, isobaric and isochoric. The curve which represents the adiabatic process among 1, 2, 3 and 4 is:
The angular speed of a flywheel moving with uniform angular acceleration changes from 1200 rpm to 3120 rpm in 16 seconds. The angular acceleration in rad/s2 is:
A shell of mass m is at rest initially. It explodes into three fragments having mass in the ratio \(2:2:1\). If the fragments having equal mass fly off along mutually perpendicular directions with speed v, the speed of the third (lighter) fragment is
A spherical ball is dropped in a long column of a highly viscous liquid. The curve in the graph shown, which represents the speed of the ball (v) as a function of time (t) is:
When light propagates through a material medium of relative permittivity єr, and relative permeability єr, the velocity of light, v is given by (c - velocity of light in vacuum)
The truth table for the given logic circuit is:
A capacitor of capacitance C=900 pF is charged rally by 100 V battery B as shown in figure (a). Then B is disconnected from the battery and connected to another uncharged capacitor of capacitance C=900 pF as shown in figure (b). The electrostatic energy stored by the system (b)is:
From Ampere’s circuital law for a long straight wire of circular cross-section carrying a steady current, the variation of magnetic field in the inside and outside region of the wire is:
In the given circuits (a), (b) and (c), the potential drop across the two p-n junctions are equal in:
The ratio of the radius of gyration of a thin uniform disc about an axis passing through its centre and normal to its plane to the radius of gyration of the disc about its diameter is