List of top Questions asked in JEE Main

The equations of two waves are given by : 
y1 = 5 sin 2π(x – vt) cm
y2 = 3 sin 2π(x – vt + 1.5) cm
These waves are simultaneously passing through a string. The amplitude of the resulting wave is :
The approximate height from the surface of the earth at which the weight of the body becomes \(\frac{1}{3}\) of its weight on the surface of earth is [Radius of earth R = 6400 km and √3=1.732]

Choose the correct option from the following options given below :

Nucleus A is having mass number 220 and its binding energy per nucleon is 5.6 MeV. It splits in two fragments ‘B’ and ‘C’ of mass numbers 105 and 115. The binding energy of nucleons in ‘B’ and ‘C’ is 6.4 MeV per nucleon. The energy Q released per fission will be :

\(lim(x→\frac{x}{2}) tan^2x((2sin^2x+3sinx+4)^{\frac{1}{2}}-(sin^2x+6sinx+2)^{\frac{1}{2}}\) is equal to.

When light of frequency twice the threshold frequency is incident on the metal plate, the maximum velocity of emitted electron is v1. When the frequency of incident radiation is increased to five times the threshold value, the maximum velocity of emitted electron becomes v2. If v2 = x v1, the value of x will be ________.

In a potentiometer arrangement, a cell gives a balancing point at 75 cm length of wire. This cell is now replaced by another cell of unknown emf. If the ratio of the emf’s of two cells respectively is 3 : 2, the difference in the balancing length of the potentiometer wire in above two cases will be _____ cm.

A metre scale is balanced on a knife edge at its centre. When two coins, each of mass 10 g are put one on the top of the other at the 10.0 cm mark the scale is found to be balanced at the 40.0 cm mark. The mass of the metre scale is found to be \(x\times 10^{-2}\) kg. The value of x is _________.

Which of the following sets of quantum numbers is not allowed?

20 mL of 0.1 M NH4OH is mixed with 40 mL of 0.05 M HCl.The pH of the mixture is nearest to(Given :Kb(NH4OH) = 1×10–5,log2 = 0.30,log3 = 0.48, log5 = 0.69,log7 = 0.84,log11 = 1.04)

Match List-I with List-II.

List-IList-II
(A) N2(g) + 3H2(g) → 2NH3(g)(I) Cu
(B) CO(g) + 3H2(g) → CH4(g) + H2O(g)(II) Cu/ZnO – Cr2O3
(C) CO(g) + H2(g) → HCHO(g)(III) FexOy + K2O + Al2O3
(D) CO(g) + 2H2(g) → CH3OH(g)(IV) Ni

Choose the correct answer from the options given below :

The IUPAC nomenclature of an element with electronic configuration [Rn] 5f146d17s2 is

The compound(s) that is(are) removed as slag during the extraction of copper is
(A)CaO,(B)FeO,(C)Al2O3,(D)ZnO,(E)NiO
Choose the correct answer from the options given below :

The reaction of H2O2 with potassium permanganate in acidic medium leads to the formation of mainly

Choose the correct order of density of the alkali metals.

The geometry around boron in the product ‘B’ formed from the following reaction is

The interhalogen compound formed from the reaction of bromine with excess of fluorine is a :

The photochemical smog does not generally contain :

A compound’A’ on reaction with ‘X’ and ‘Y’ produces the same major product but differentby product’a’ and ‘b’. Oxidation of’a’ gives a substance produced by ants.

Most stable product of the following reaction is :
Most stable product

Which one of the following reactions does not represent correct combination of substrateand product under the given conditions?

Melamine polymer is formed by the condensation of :

During the denaturation of proteins, which of these structures will remain intact?

Drugs used to bind to receptors, inhibiting its natural function and blocking a message are called:

Among the following species
N2,N2+,N2−,N22−,O2,O2+,O2−,O22−
the number of species showing diamagnetism is ________.