List of top Questions asked in JEE Main- 2023

The resistivity (\( \rho \)) of a semiconductor varies with temperature. Which of the following curves represents the correct behavior? resistivity ( ρ ρ) of a semiconductor varies with temperature
A long straight wire of circular cross-section (radius \( a \)) is carrying a steady current \( I \). The current \( I \) is uniformly distributed across this cross-section. The magnetic field is:
Let A=\(\begin{bmatrix} 1 & \frac{1}{51} \\ 0 & 1\end{bmatrix}\). If B=\(\begin{bmatrix} 1 & 2 \\ -1 & -1\end{bmatrix}\)A \(\begin{bmatrix} -1 & -2 \\ 1 & 1\end{bmatrix}\), then the sum of all the elements of the matrix \(\sum^{50}_{n=1}B^n\) is equal to


Choose the correct option.
 

Consider the above reaction and identify the product B.
Consider the above reaction and identify the product B.

Assuming the earth to be a sphere of uniform mass density, the weight of a body at a depth \(d=\frac{R}{2}\) from the surface of earth, if its weight on the surface of earth is 200 N, will be 
Find the equivalent resistance across A and B for given circuit.
equivalent resistance across A and B
A radioactive nuclei X decays simultaneously to two nuclei Y and Z as:
radioactive nuclei X decays
t½ is 12 minutes while t'½ is 3 minutes. Find the time in which nuclei X decays 50%.
\(tan^{-1}(\frac {1+\sqrt 3}{3+\sqrt 3})+sec^{-1}(\sqrt {\frac {8+4\sqrt 3}{3+3\sqrt 3})}\) is equal to:
'X' is: 
X is:
Pick the correct graph between potential V at distance r from centre for the uniformly charged spherical shell of radius R.
 
graph
α-particle, proton & electron have same kinetic energy. Select correct order of their de-Broglie wavelength.
Match List I with List I:
List IList II
AAM BroadcastI88-108 MHz
BFM BroadcastII540-1600 kHz
CTelevisionIII3.7-4.2 GHz
DSatellite CommunicationIV54 MHz​-890 MHz








 
Choose the correct answer from the options given below:

The correct sequence of reagents for the preparation of Q and R is:
The correct sequence of reagents for the preparation of Q and R is:

Mass of body = 500 kg,  μ= 0.7. Find work required to move a distance of 4 Km if the body moves with velocity 10 m/s.
Statement (1): A truck and a car moving with equal kinetic energy are stopped by equal retarding force. Both will cover equal distance to stop.
Statement (2): A car moving towards east suddenly changes its direction towards north with same speed. Its acceleration is zero.
In the light of given statements, choose the most appropriate answer from the options given below.
Match the physical quantity in column-I with the respective dimension in column-II and choose the correct option.
 Column-I Column-II
I.Spring constant(P)[ML2T0 ]
II.Moment of inertia(Q)[M0L0T–1 ]
III.Angular momentum(R)[ML0T–2 ]
IV.Angular speed(S)[ML2T–1 ]
The length of a conductor having resistance 160 Ω, is compressed to 25% of its initial value. The new resistance will be
Statement I : In LCR circuit, by increasing frequency current increases first then decreases.
Statement II : Power factor of LCR circuit is one.
Choose the correct option.
Assertion (A): An electrical dipole is enclosed in a closed gaussian surface. The total flux through the enclosed surface is zero. 
Reason (R): Net charge inside the enclosed surface is zero.
A circular ring is placed in magnetic field of 0.4 T. Suddenly its radius starts shrinking at the rate of 1 mm/s. Find the induced emf in the ring at r = 2 cm.
A body is doing SHM with amplitude A. When it is at \( x =+ \frac{A}{2}\) , find ratio of kinetic energy to potential energy.
Bob P is released from the position of rest at the moment shown. If it collides elastically with an identical bob Q hanging freely then velocity of Q, just after collision is (g = 10 m/s2).
Choose the option showing the correct relation between Poisson’s ratio (σ), Bulk modulus (B) and modulus of rigidity (G).
Two conducting solid spheres (A & B) are placed at a very large distance with charge densities and radii as shown: