List of top Questions asked in JEE Main- 2023

What is the chemical formula of freon gas?

2 gm of x is present in 1 mole of H2O.Find the mass % of x

Given below are two statements, one is labelled as Statement-1 and the other is labelled as Statement-2: Statement-1: Sulphides are converted into oxide first. Statement-2: Because oxides can be reduced easily. In the light of the above statements, choose the correct answer from the options given below

Which of the following has maximum number of l.p. at central atom?

Glucose is added in 100 gm of water. Lowering in vapor pressure is 0.2 mm Hg. Vapour pressure of pure water is 54.2 mm Hg. Then the weight of glucose is?

Least stable Hydride is?

The number of solutions of cos4θ – 2cos2θ + 3sin6θ + 1 = 0 in [0,2π] is
Let awards in event A is 48 and awards in event B is 25 and awards in event C is 18 and also n(A ∪ B ∪ C) = 60, n(A ⋂ B ⋂ C) = 5, then how many got exactly two awards is?
Let a and b are roots of x2 – 7x – 1 = 0. The value of \(\frac{a^{21} + b^{21} + a^{17} + b^{17}}{a^{19} + b^{19}}\) is?

Match the columns Column I Column II (a) Biodegradable (p) polyacrylonitrie (b) Synthetic (q) PHBV (c) Natural (r) dacron (d) Polyester (s) Rubber

For lead storage battery pick the correct statements:
A. During charging of battery, PbSO4 on anode is converted into PbO2
B. During charging of battery, PbSO4 on cathode is converted into PbO2
C. lead storage battery consists of grid of lead packed with PbO2 as anode
D. lead storage battery - 38% solution of sulphuric acid as an electrolyte
choose the correct answer from the options given below:

Calculate mass of Tollen’s Reagent Required?

Given A, B, C represents angles of a  ⃤ AB and cosA + 2 cosB + cosC = 2 and AB = 3 and BC = 7 then cosA – cosC is?
A certain amount of gas of volume $V$ at $27^{\circ} C$ temperature and pressure $2 \times 10^7 Nm ^{-2}$ expands isothermally until its volume gets doubled Later it expands adiabatically until its volume gets redoubled The final pressure of the gas will be (Use $\gamma=15$ )
The following statements are given : 
(1) The average kinetic energy of a gas molecule decreases when the temperature is reduced 
(2) The average kinetic energy of a gas molecule increases with increase in pressure at constant temperature 
(3) The average kinetic energy of a gas molecule decreases with increases in volume 
(4) Pressure of a gas increases with increase in temperature at constant pressure 
(5) The volume of gas decreases with increase in temperature 
Choose the correct answer from the options given below :
In figure $(A)$, mass ' $2\, m$ ' is fixed on mass ' $m$ ' which is attached to two springs of spring constant $k$ In figure $(B)$, mass ' $m$ ' is attached to two spring of spring constant ' $k$ ' and ' $2\, k$ ' If mass ' $m$ ' in $(A)$ and $(B)$ are displaced by distance ' $x$ ' horizontally and then released, then time period $T_1$ and $T_2$ corresponding to (A) and (B) respectively follow the relation
A condenser of $2 \,\mu F$ capacitance is charged steadily from $0$ to $5 C$ Which of the following graph represents correctly the variation of potential difference $(V)$ across it's plates with respect to the charge $( Q )$ on the condenser?
Two charged particles, having same kinetic energy, are allowed to pass through a uniform magnetic field perpendicular to the direction of motion If the ratio of radii of their circular paths is $6: 5$ and their respective masses ratio is $9: 4$ Then, the ratio of their charges will be :
To increase the resonant frequency in seriesLCR circuit,
A small square loop of wire of side $l$ is placed inside a large square loop of wire $L ( L >>l)$ Both loops are coplanar and their centers coincide at point $O$ as shown in figure The mutual inductance of the system is :
The rms value of conduction current in a parallel plate capacitor is $69\, \mu A$ The capacity of this capacitor, if it is connected to $230 \, V$ ac supply with an angular frequency of $600\, rad / s$, will be :
Time taken by light to travel in two different materials $A$ and $B$ of refractive indices $\mu_{ A }$ and $\mu_{ B }$ of same thickness is $t _1$ and $t _2$ respectively If $t_2-t_1=5 \times 10^{-10} s$ and the ratio of $\mu_{ A }$ to $\mu_{ B }$ is $1: 2$ Then the thickness of material, in meter is: (Given $v_A$ and $v_B$ are velocities of light in $A$ and $B$ materials respectively)
A metal exposed to light of wavelength $800\, nm$ and emits photoelectrons with a certain kinetic energy The maximum kinetic energy of photo-electron doubles when light of wavelength $500\, nm$ is used The work function of the metal is (Take $hc =1230 \,eV - nm )$
The magnetic moment of an electron (e) revolving in an orbit around nucleus with an orbital angular momentum is given by :
A car is moving with speed of 150km/h and after applying the brake it will move 27m before it stops. If the same car is moving with a speed of one third the reported speed then it will stop after travelling ______m distance.