List of top Questions asked in JEE Main

Two concentric conducting rings of radius a and b are placed as shown in diagram (a < < b). Find coefficient of mutual inductance of rings
coefficient of mutual inductance of rings
A block of mass m = 50 kg is lifted from ground to a height of 20 m in two different ways as shown in the figure. Find the ratio of work done by gravity in both the cases.
ratio of work done by gravity in both the cases
Find dimension of \(\sqrt{G}\).𝞵, where G is universal gravitational constant and 𝞵 is energy gradient
If the time period of a pendulum at height R (Where R is radius of earth) from surface of earth is $T_1$ and at height 2R it is $T_2$, then
The ratio of radius of gyration of uniform hollow sphere and uniform solid sphere about its diameter is _______ (both have the same radius)
The maximum amplitude of an amplitude-modulated wave is found to be 15V while its minimum amplitude is found to be 3V. The modulation index is:
How many of the given statements are true for fuel cell? 
A. It is a type of Galvanic cell 
B. It is used for providing electrical power in space programmes. 
c. Hydrogen and oxygen are bubbled through porous carbon electrodes into concentrated NaOH solution 
D. It produces electricity with an efficiency of 40% 
E. It is pollution free cell
The total number of chain isomers possible for a compound with molecular formula $C_7H_{16}$ are:
Because of force (separately) of 3 N & 2 N, elongation in spring are found to be 'a' and 'b' unit respectively then (2a -3b) is.
An element of d-block (Z) of 4th period has spin only magnetic moment of its $Z^{3+}$ form is 3.9 BM, then find minimum atomic number of element (Z).
Maximum number of orbitals possible when n = 4 and m = 0?
What is the maximum amount of acetanilide formed when acetic anhydride in excess is treated with 18 gm of aniline. (nearest integer)
Arrange the following anions in the decreasing order of their stability.
Arrange the following anions in the decreasing order of their stability.
What is the sum of number of ɑ and π bonds present in 2-oxo-hex-4-yne-oic acid ?
For methane, translation degrees of freedom is $f_1$ while rotational degrees of freedom is $f_2$ . Find $f_1$ + $f_2$ .
A bar magnet of magnetic moment M = 0.5A m2 is under the influence of a magnetic field 8 T. Find the work done (J) to move the magnet from stable to unstable equilibrium position.
Which one of the following has the most negative (highest –ve) electron gain enthalpy?
Two point mass m and 2m are on straight line. If mass m moves toward centre of mass by distance 2 cm, then the distance must mass 2m should move so that centre of mass does not change ______ cm.
Which of the following is used as adsorbent in adsorption chromatography?
If a, b, c are in increasing A.P. and a + 1, b, c + 3 are in G.P. If A.M. of a, b, c is 8. Find cube of G.M. of a, b, c.
Consider the following statements:
Statement I: The number of emitted photoelectrons Increases with increase in frequency of incident light.
Statement II: Kinetic energy of emitted photoelectrons increases with increase in frequency of incident light
Find out number of unpaired electrons in d-subshell for $[Co(H_2O)_6]^{ 3+}. $
IUPAC name of Catechol is-

Major product A is

Hydrocarbons

A parabola $y^2 = 12x$ has a chord PQ with mid-point (4, 1) then equation of PQ passes through