List of top Questions asked in JEE Main

In a monoclinic unit cell, the relation of sides and angles are respectively :

Which of the following series correctly represents relations between the elements from X to Y?
\(X\to Y\)

In a face centered cubic lattice atoms $A$ are at the corner points and atoms $B$ at the face centered points. If atom $B$ is missing from one of the face centered points, the formula of the ionic compound is :

Which one of the following has largest ionic radius?

In materials like aluminium and copper, the correct order of magnitude of various elastic modulii is :

The amount of oxygen in $3.6$ moles of water is :

Aminoglycosides are usually used as :

The conjugate base of hydrazoic acid is :

The appearance of colour in solid alkali metal halides is generally due to :

The ratio mass of oxygen and nitrogen of a particular gaseous mixture is $1 : 4$ The ratio of number of their molecule is

$CsCl$ crystallises in body centred cubic lattice. If 'a' is its edge length, then which of the following expressions is correct?

Electron gain enthalpy with negative sign of fluorine is less than that of chlorine due to :

The catenation tendency of $C, Si$ and $Ge$ is in the order Ge $

If two vertices of an equilateral triangle are $A (- a, 0)$ and $B (a, 0), a > 0$, and the third vertex $C$ lies above x-axis then the equation of the circumcircle of $\Delta ABC$ is :

Let the equations of two ellipses be $E_{1} : \frac{x^{2}}{3}+\frac{y^{2}}{2}=1 and E_{2} : \frac{x^{2}}{16}+\frac{y^{2}}{b^{2}}=1$, If the product of their eccentricities is $\frac{1}{2}$, then the length of the minor axis of ellipse $E_2$ is:

Statement 1 : The only circle having radius $\sqrt{10}$ and a diameter along line $2 x+y=5 \, is\, x^{2}+y^{2}-6x+2y=0.$ Statement 2 : $2x + y = 5$ is a normal to the circle $x^{2}+y^{2}-6x+2y=0.$

Compound $( A ), C_8H_9Br$ gives a white precipitate when warmed with alcoholic $AgNO_3$. Oxidation of $(A)$ gives an acid $(B)$, $C_8H_6O$ 4. $(B)$ easily forms anhydride on heating. Identify the compound $(A)$.

Formaldehyde can be distinguished from acetaldehyde by the use of :

Monocarboxylic acids are functional isomers of:

Glycosidic linkage is actually an :

Which of the following enzyme converts starch into maltose?

Which of the following structures represents thymine?

Natural glucose is termed D-glucose because :

Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown-red vapours of :

The order of reactivity of the given haloalkanes towards nucleophile is :