List of top Questions asked in JEE Main

In the above reaction product ’P’ is

The coordination environment of $ \text{Ca}^{2+} $ ion in its complex with $ \text{EDTA}^{4-} $ is:

Choose the correct answer from the options given below:

The correct increasing order for bond angles among $ \text{BF}_3, \, \text{PF}_3, \, \text{and} \, \text{CF}_3 $ is:

Total number of stereo isomers possible for the given structure:

The correct stability order of the following resonance structures of $ \text{CH}_3 - \text{CH} = \text{CH} - \text{CHO} $ is:

The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency $ 'A' \times 10^{12} \, \text{hertz} $ and that has a radiant intensity in that direction of $ \frac{1}{'B'} \, \text{watt per steradian} $. 'A' and 'B' are respectively:

A force $ (3x^2 + 2x - 5) \, \text{N} $ displaces a body from $ x = 2 \, \text{m} $ to $ x = 4 \, \text{m} $. The work done by this force is _________ J.

The resultant of two vectors $ \vec{A} $ and $ \vec{B} $ is perpendicular to $ \vec{A} $ and its magnitude is half that of $ \vec{B} $. The angle between vectors $ \vec{A} $ and $ \vec{B} $ is ________ .

A circular disc reaches from top to bottom of an inclined plane of length $ l $. When it slips down the plane, it takes $ t $ s. When it rolls down the plane, then it takes \[ \left( \frac{\alpha}{2} \right)^{1/2} t \, \text{s}, \] where $ \alpha $ is __________ .

An electric field $ \vec{E} = (2x \hat{i}) \, \text{N C}^{-1} $ exists in space. A cube of side $ 2 \, \text{m} $ is placed in the space as per the figure given below. The electric flux through the cube is __________ $ \text{N m}^2/\text{C} $.

A particle of mass $ 0.50 \, \text{kg} $ executes simple harmonic motion under force $ F = -50 \, (\text{N m}^{-1}) x $. The time period of oscillation is $ \frac{x}{35} \, \text{s} $. The value of $ x $ is $ \dots \dots \dots \dots $. \[ \text{(Given } \pi = \frac{22}{7} \text{)} \]

A straight magnetic strip has a magnetic moment of $ 44 \, \text{A m}^2 $. If the strip is bent in a semicircular shape, its magnetic moment will be $ \dots $ A m$^2$. \[ \text{(Given } \pi = \frac{22}{7} \text{)} \]

In the truth table of the above circuit the value of X and Y are

A 1 kg mass is suspended from the ceiling by a rope of length 4m. A horizontal force 'F' is applied at the mid point of the rope so that the rope makes an angle of 45° with respect to the vertical axis as shown in figure. The magnitude of F is

The energy released in the fusion of 2 kg of hydrogen deep in the sun is $E_H$ and the energy released in the fission of 2 kg of $^{235}U$ is $E_U$. The ratio $\frac{E_H}{E_U}$ is approximately:

UV light of 4.13 eV is incident on a photosensitive metal surface having work function 3.13 eV. The maximum kinetic energy of ejected photoelectrons will be

A proton and a deuteron ($ q = +e, \, m = 2.0u $) having the same kinetic energies enter a region of uniform magnetic field $ \vec{B} $, moving perpendicular to $ \vec{B} $. The ratio of the radius $ r_d $ of the deuteron path to the radius $ r_p $ of the proton path is:

Five charges +q, +5q, –2q, +3q and –4q are situated as shown in the figure. The electric flux due to this configuration through the surface S is

The de-Broglie wavelength associated with a particle of mass $ m $ and energy $ E $ is \[\lambda = \frac{h}{\sqrt{2mE}}.\]The dimensional formula for Planck's constant is:

The excess pressure inside a soap bubble is thrice the excess pressure inside a second soap bubble. The ratio between the volume of the first and the second bubble is :

The I-V characteristics of an electronic device shown in the figure. The device is

Two cars are travelling towards each other at a speed of $ 20 \, \text{m/s} $ each. When the cars are $ 300 \, \text{m} $ apart, both the drivers apply brakes and the cars retard at the rate of $ 2 \, \text{m/s}^2 $. The distance between them when they come to rest is:

A square loop of side 15 cm being moved towards right at a constant speed of 2 cm/s as shown in figure. The front edge enters the 50 cm wide magnetic field at t = 0. The value of induced emf in the loop at t = 10 s will be :

The temperature of a gas is $-78^\circ\text{C}$ and the average translational kinetic energy of its molecules is $ K $. The temperature at which the average translational kinetic energy of the molecules of the same gas becomes $ 2K $ is: