List of top Questions asked in JEE Main

For a device, power consumed = 110 W and voltage supplied is 220 V. The number of electrons that flow in 1 is \(\frac{x}{4}\) × 1017 . Find x.
Find net kinetic energy (maximum possible) associated with 20 diatomic molecules (Here kB is Boltzmann constant and T is absolute temperature of diatomic gas).
An ammeter consisting of 240 Ω galvanometer and 10 Ω shunt resistance is connected in circuit as shown. Reading of ammeter is
An ammeter consisting of 240 Ω galvanometer
Find the longest wavelength of the Paschen series for hydrogen atom. (Rydberg constant = 107 /m)
The weight of an object measured on the surface of earth is 300 N. What will be the weight of the same object at depth R/4 inside the earth? (Given R = Radius of earth)
A ball is projected vertically upwards from a building. The time taken to reach ground is T1. Another ball is projected downwards from the same building, with the same speed. The time taken to reach ground is T2. If a third ball is released from the same building, the time taken to reach the ground is
If the kinetic energy of a block of mass m becomes 36 times by keeping its mass constant, by what percentage will the momentum increase?
A tree branch holds a weight of 200 N by a uniform chain of mass 10 kg. The force applied by branch to hold this weight is ______ (Take g = 10 m/s2 )
There are two fixed charged spheres P and Q repelling each other with a force of 16 N. A third neutral sphere is placed between the charged spheres. The new force between the spheres is _________ (assuming all the spheres are insulating)
Which of the following statement is INCORRECT
A metallic rod of length 4 m is rotating about perpendicular bisector of the rod with angular velocity of 2 rad/s in presence of transverse magnetic field of 0.5 T. Potential difference developed across ends of rod is
Instantaneous current in a circuit is \(i(t)=[6+\sqrt54sin(2\pi + \pi/3)]\) A RMS value of current is
The 50th word in the dictionary using the letters B, B, H, J, O is:
The number of real solution x|x + 5| + 2|x + 7| - 2 = 0 is
How many of the following have zero dipole moment $H_2S, CH_4, NH_3, BF_3, SO_2, NF_3$
In an atom, how many electrons can have
(i) n = 4 (ii) m1 =1 (iii) ms = ½
Number of π bonds present in product B is:
π bonds present in product B is
Which of the following molecule is an acidic oxide?
Equanil drug is used for which disease?
Angular momentum of an electron in an orbit of radius R of a hydrogen atom is directly proportional to
Shortest wavelength in Lyman series has wavelength of 915 À. Longest wavelength of Balmer series has a value of ?
A solid sphere is rolling without slipping. Find the ratio of rotational kinetic energy to total kinetic energy of sphere.
A truck is moving from rest with constant power P. if the displacement of the truck is proportional to t", where t is time, find n.
A block of mass 50 kg is moving with speed of 10 m/s on a rough horizontal surface (friction coefficient of 0.3). Find the kinetic friction acting on the object.
In thermodynamics adiabatic process, pressure is directly proportional to cube of absolute temperature. Find $\frac{C_P}{C_V} $for the gas.