List of top Questions asked in JEE Main

Quantum number for outermost electron of K-atom are given by

Which of the following has maximum ionic character?

Statement-I : Among \(15^{th}\) group hydrides reducing character decreases from
\(NH_3\) to \(BiH_3\).
Statement-II : \(E_2O_3\) and \(E_2O_5\) are always basic. [Where \(E\) is group \(15\) element]

Statement I: So disproportionates into \(H_2S_2O_3\) and \(S_2^-\) in alkaline medium
Statement II: \(ClO_4^-\) undergoes disproportionation in acidic medium

From the vitamins \(A, B-1, B-6, B-12, C, D\), and \(K\), the number of vitamins that can be stored in our body is

Select the option of the correct property Paramagnetic & Diamagnetic \([Ni(CO_4)],[Ni(Cl_4)]^{-2}\)

Which of the following is least iconic

A stationary hydrogen atom deexcites from first excited state to ground state. Find recoil speed of hydrogen atom up to nearest integer value.
(mass of hydrogen atom = \(1.8 \times 10^{-27}\) \(kg\))

In the system shown below, the pulley \(4\) string are ideal. If the acceleration of blocks is \(\frac{g}{8}\) , find \(\frac{m_1}{m_2}\)

The magnetic flux through a loop varies with time as \(Φ= 5t^2 -3t +5\). If the resistance of loop is \(8\) , find the current through it at \(t = 2\) \(s\)

Radius of curvature of equiconvex lens is 20 cm. Material of lens is having refractive index of 1.5. Find image distance from lens if an object is placed 10 cm away from the lens.

In a photoelectric experiment, frequency \(f = 1\).\(5f_0\) (\(f_o\): threshold frequency). If the frequency of light is changed to \(\frac{f}{2}\), then photocurrent becomes (intensity of light has doubled)

Unpolarised light incident on transparent glass at incident angle 60°. If reflected ray is completely polarized, then angle of refraction is

If the current through an incandescent lamp decreases by 20%, how much change will be there in its illumination?

Best reducing agent among the given ions are:

If standard enthalpy of vaporization of \(CCl_4\) is \(30.5\) kJ/mol, find heat absorbed for vaporization of \(294 \) gm of \(CCl_4\). [Nearest integer] [in kJ/mol]

IUPAC Name of the compound

is