List of top Questions asked in JEE Main- 2019

The contrapositive of the statement "If you are born in India, then you are a citizen of India", is :

The correct decreasing order for acid strength is :

The effect of lanthanoid contraction in the lanthanoid series of elements by and large means :

The energy required to take a satellite to a height $'h'$ above Earth surface (radius of Earth = $6.4 \times 10^3 \; km) $ is $E_1$ and kinetic energy required for the satellite to be in a circular orbit at this height is $E_2$. The value of $h$ for which $E_1 $ and $E_2$ are equal, is:

The figure shows a square loop $L$ of side $5\, cm$ which is connected to a network of resistances. The whole setup is moving towards right with a constant speed of $1\, cms^{-1}$. At some instant, a part of $L$ is in a uniform magnetic field of $1T$, perpendicular to the plane of the loop. If the resistance of $L$ is $1.7\, \Omega$ , the current in the loop at that instant will be close to :

The idea of froth floatation method came from a person $X$ and this method is related to the process $Y$ of ores. $X$ and $Y$, respectively, are:

The integral $ \int \frac{2x^{3} -1}{x^{4} +x} dx $ is equal to : (Here C is a constant of integration)

The integral $\int \cos( \log \; x)dx$ is equal to : (where C is a constant of integration)

The isoelectronic set of ions is :

The length of the chord of the parabola $x^2 = 4y$ having equation $x - \sqrt{2} y + 4 \sqrt{2} = 0$ is :

The magnitude of the magnetic field at the center of an equilateral triangular loop of side $1\,m$ which is carrying a current of $10\, A$ is : [Take $\mu_0 = 4\pi \times 10^{-7} \; NA^{-2}]$

The major product formed in the following reaction is:

The major product formed in the following reaction is :

The mass and the diameter of a planet are three times the respective values for the Earth. The period of oscillation of a simple pendulum on the Earth is $2s$. The period of oscillation of the same pendulum on the planet would be :

The maximum volume (in $cu. m$) of the right circular cone having slant height $3\,m$ is :

The mean and the median of the following ten numbers in increasing order $10, 22, 26, 29, 34, x 42, 67, 70,\, y$ are $42$ and $35$ respectively, then $\frac{y}{x}$ is equal to :

The metal used for making $X$-ray tube window is :

The Mond process is used for the

The number density of molecules of a gas depends on their distance r from the origin as, $n(r) = n_0e^{-\alpha r^4}$ Then the total number of molecules is proportional to :

The number of all possible positive integral values of $\alpha$ for which the roots of the quadratic equation, $6x^2 - 11 x + a = 0$ are rational numbers is :

The number of bridging $CO$ ligand (s) and $Co - Co$ bond (s) in $ {CO_2(CO)_8}$, respectively are :

The number of integral values of m for which the equation $(1 + m^2)x^2 - 2(1 + 3m)x + (1 + 8m) = 0$ has no real root is :

The outcome of each of $30$ items was observed; $10$ items gave an outcome $\frac{1}{2} - d$ each, $10$ items gave outcome $\frac{1}{2}$ each and the remaining 10 items gave outcome $\frac{1}{2} + d$ each. If the variance of this outcome data is $\frac{4}{3}$ then |d| equals :

The output of the given logic circuit is :

The pair that has similar atomic radii is :