List of top Questions asked in JEE Main

Which postulate of Dalton's theory is wrong

A short linear object of length b lies along the axis of a concave mirror of focal length $\mathrm{f}$ at a distance $\mathrm{u}$ from the pole of the mirror. The size of the image is approximately equal to:

In the pure inductive circuit, the curves between frequency $f$ and reciprocal of inductive reactance $\frac{1}{X_L}$ is:

The number of isomeric forms that are represented by C7H9N is:

Sodium metal crystallizes in a body centred cubic lattice with unit cell edge length of 4 Å. The radius of sodium atom is __________ × 10⁻¹ Å (Nearest integer)

The naturally occurring amino acid that contains only one basic functional group in its chemical structure is

Which of the following has a maximum dipole moment?

If radius of earth reduced by one fourth of its present value, then duration of days will be

Identify the product formed in the following reaction:

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.

If y=\(\frac{2\cos2\theta+\cos\theta}{\cos3\theta+\cos^2\theta+\cos\theta}\), Then value of y''+y'+y is

The ratio of radius of gyration of uniform hollow sphere and uniform solid sphere about its diameter is _______ (both have the same radius)

From the given information, calculate enthalpy of formation of 2 moles of $C_6H_6$(l) at 25°C. Given: $CH(C_6H_6$(l)) = –3264.6 kJ/mol $CH(C(s))$ = –393.5 kJ/mol $fH(H_2O(l))$ = –285.83 kJ/mol

The products obtained when chlorine gas reacts with cold and dilute aqueous $NaOH$ are:

Statement-I : Stability of +1 oxidation state increases as Ga< In < Tl
Statement-II : Stability of +1 oxidation state increases down the group due to inert pair effect.

Assertion: Trans But-2-ene is less polar than cis But-2-ene
Reason: Trans But-2-ene has zero dipole moment

Which of the following compound is optically active?

If the number of neutrons in the most abundant isotope of boron is 'x' and its highest oxidation state in unsaturated compound is 'y', then find the value of (x+y).

The correct order of increasing $C-O$ bond length of $CO, C{O}_3^{2-}, C{O}_2$ is:

Which metal shows the highest and maximum number of oxidation states?

A proton moving with one tenth of velocity of light has a certain de Broglie wavelength of $\lambda$ An alpha particle having certain kinetic energy has the same de-Brogle wavelength $\lambda$ The ratio of kinetic energy of proton and that of alpha particle is:

Shortest wavelength in Lyman series has wavelength of 915 À. Longest wavelength of Balmer series has a value of ?

Find the current I in the given circuit

In a pond of water, a flame is held 2 m above the surface of water. A fish is at depth of 4 m from water surface. Refractive index of water is $\frac{4}{3}$. The apparent height of the flame from the eyes of fish is: