List of top Questions asked in JEE Main, KCET

Which of the following are aromatic compounds?
aromatic compounds
Which of the following is correct?
S-I: Blood is a buffer solution, whose pH is maintained at 7.4 by an acidic buffer. 
S-II: pH is maintained by HCO3-  and   H2CO3
In the test for phosphorus using ammonium molybdate, yellow precipitate of compound (X) is obtained. What is the oxidation state of molybdenum in (X)?
How many carbon atoms are there in a molecule of tyrosine?
Number of 5 letters words made from the word “MATHEMATICS” is equal to
sum of elements of 10th row,Then the sum of elements of 10th row.
Two points (5, 2) and (2, a). Line passes through these points makes an angle of π/4 at origin. The product of all values of a is equal to
A triangle is drawn inside a bounded region of y2 = 2x and x = 24. Then maximum area of triangle is
If |x + 1||x + 3| – 4|x + 2| + 5 = 0, then sum of squares of solutions is
If solution of differential equation xdy - ydx = xy(xdy - ydx) and y(1) = 1 is α|y| = |x|e(xy - β) then (α + β) is equal to
If the complex number (1 + 2i cosθ) / (1 - 3i cosθ) is purely imaginary, then find the number of values of θ in the interval [-2π, 2π].
Given \(f(x) =   \begin{cases}     \frac{tan((a+1)x)+tanx\cdot b}{x}       & \quad x\lt 0\\     3  & \quad x=0\\ \frac{\sqrt{ax+b^2x^2}-\sqrt{ax}}{\sqrt{a}bx\sqrt{x}}  & \quad x\gt 0\end{cases}\) It is a continuous function at x=0, then find \(\frac{b}{a}\)
Molecular orbital σ* represents:
Velocity of a particle of mass m as a function of displacement x is given by v = ɑ√x. Work done to move it from x = 0 to x = d is:
Two persons are pulling a rope towards themselves with a force of 200 N each. If the Young's modulus is 2 x 1011 N/m2 and area of cross-section is 2 cm2 for the rope, the elongation in the rope is ____.
(distance between the persons holding the ropes is 2 m.)
Assertion (A): Object at radius of curvature of biconvex lens made by glass (u = 1.5) form image at same distance an other side of the lens.
Reason (R): Image of a real object formed by concave lens is always virtual and erect.
Find the equivalent resistance between terminal A and B for the given network.
the equivalent resistance between terminal A and B
For the reaction:
Gattermann–Koch reaction
Product (P) is
Consider the following electronic configuration:
Cu2+ = [Ar] 3d44s0
Cu+ = [Ar] 3d104s0
Which option is correct?
Arrange the following in increasing order of acidity.
increasing order of acidity. increasing order of acidity. increasing order of acidity. increasing order of acidity. increasing order of acidity.
Consider the following compound.
Correct order of their basicity is
Correct order of their basicity is:
Which of the following is colorless?
Which among the following have a single unpaired electron?
N2, 02, CN-, O2-, C22- , N2-
S-I: Sulphur exists as S8 while oxygen exists as O2.
S-II: In oxygen, pπ-pπ bonding occurs while it is not effective in sulphur.