List of top Questions asked in JEE Main- 2023

Correct statements for the given reaction are:

A. Compound 'B' is aromatic
B. The completion of above reaction is very slow
C. 'A' shows tautomerism
D. The bond lengths C-C in compound B are found to be same
Choose the correct answer from the options given below:

ClF5 at room temperature is:

The magnetic behavior of Li₂O, Na₂O₂ and KO₂, respectively, are

Which of the following compounds would give the following set of qualitative analysis?
• (i) Fehling’s Test: Positive
• (ii) Na fusion extract upon treatment with sodium nitroprusside gives a blood red colour but not

Four gases A, B, C and D have critical temperatures 5.3, 33.2, 126.0 and 154.3K respectively. For their adsorption on fixed amount of charcoal, the correct order is :

The strongest acid from the following is

Which hydride among the following is less stable?

Match the following

Column-A	Column-B
Nylon 6	Natural Rubber
Vulcanized Rubber	Cross Linked
cis-1,4-polyisoprene	Caprolactam
Polychloroprene	Neoprene.

Choose the correct answer from option given below

Which one among the following metals is the weakest reducing agent?

The major product formed in the following reaction is

Match List l with List ll.

List I Coordination Complex	List II Number of unpaired electrons
(I) [Cr(CN)₆]^3-	(a) 0
(II) [Fe(H₂O)₆]²⁺	(b) 3
(III) [Co(NH₃)₆]³⁺	(c) 2
(IV) [Ni(NH₃)₆]²⁺	(d) 4

Choose the correct answer from the options given below:

A wire of length 'L' and radius 'r' is clamped rigidly at one end. When the other end of the wire is pulled by a force f, its length increases by 'l'. Another wire of same material of length '2L' and radius '2r' is pulled by a force '2f'. Then the increase in its length will be

In a Young's double slits experiment, the ratio of amplitude of light coming from slits is 2:1. The ratio of the maximum to minimum intensity in the interference pattern is

The ratio of escape velocity of a planet to the escape velocity of earth will be:- Given: Mass of the planet is 16 times mass of earth and radius of the planet is 4 times the radius of earth.

The modulation index for an A.M. wave having maximum and minimum peak-to-peak voltages of 14 mV and 6 mV respectively is:

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R
Assertion A : The binding energy per nucleon is practically independent of the atomic number for nuclei of mass number in the range 30 to 170.
Reason R : Nuclear force is short ranged.
In the light of the above statements, choose the correct answer from the options given below:

A child of mass 5 kg is going round a merry-goround that makes 1 rotation in 3.14 s. The radius of the merry-go-round is 2 m. The centrifugal force on the child will be

Match List-I with List-II

	List- I (Layer of atmosphere)		List- II (Approximate height over earth's surface)
A.	F₁-Layer	I.	10 km
B.	D-Layer	II.	170-190 km
C.	Troposphere	III.	100 km
D.	E-layer	IV.	65-75 km

Choose the correct answer from the options given below:

At $300 K$ the rms speed of oxygen molecules is $\sqrt {\frac {\alpha+5}{\alpha}}$ times to that of its average speed in the gas. Then, the value of $\alpha$ will be
(used $\pi=\frac {22}{7}$)

If a radioactive element with a half-life of 30 min undergoes beta decay. The fraction of the radioactive element that remains undecayed after 90 min is:

The orbital angular momentum of a satellite is L, when it is revolving in a circular orbit at height h from earth surface. If the distance of satellite from the earth centre is increased by eight times to its initial value, then the new angular momentum will be

Match List I with List I:

List I		List II
A	AM Broadcast	I	88-108 MHz
B	FM Broadcast	II	540-1600 kHz
C	Television	III	3.7-4.2 GHz
D	Satellite Communication	IV	54 MHz-890 MHz

Choose the correct answer from the options given below:

Two satellites of masses m and 3m revolve around the earth in circular orbits of radii r & 3r respectively. The ratio of orbital speeds of the satellites respectively is

The ratio of wavelengths of proton and deuteron accelerated by potential $V_p$ and $V_d$ is $1: \sqrt{2}$ Then, the ratio of $V_p$ to $V_d$ will be

The figure shows a liquid of given density flowing steadily in horizontal tube of varying cross - section. Cross sectional areas at A is 1.5 cm², and B is is 25 mm², if the speed of liquid at B is 60 cm/s then $(P_A-P_B)$ is:
(Given $P_A$ and $P_B$ are liquid pressures at A and B points.
density $ρ = 1000 \space kg \space m^{-3}$
A and B are on the axis of tube)