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?

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:

For a nucleus AAX having mass number A and atomic number Z
A. The surface energy per nucleon \((b_s)=−a_1A^{\frac{2}{3}} \)
B. The Coulomb contribution to the binding energy \(b_c=−a_2\frac{Z(Z−1)}{A^{\frac{4}{3}}} \)
C. The volume energy b_v=a₃A
D. Decrease in the binding energy is proportional to surface area.
E. While estimating the surface energy, it is assumed that each nucleon interacts with 12 nucleons. ( a₁,a₂ and a₃ are constants)
Choose the most appropriate answer from the options given below:

Dimension of \(\frac{1}{μ_0∈_0}\) should be equal to 

Certain galvanometers have a fixed core made of non magnetic metallic material. The function of this metallic material is 

In this figure the resistance of the coil of galvanometer G is 2Ω. The emf of the cell is 4 V. The ratio of potential difference across C₁ and C₂ is

Graphical variation of electric field due to a uniformly charged insulating solid sphere of radius R, with distance r from the centre O is represented by

\(2 I O^ − _3 + x I ^− + 12 H ^+ ⟶ 6 I_ 2 + 6 H _2 O\) What is the value of x?

The reaction \(\frac{ 1}{2}\)H₂(g) + AgCl(s) → H⁺(aq) + Cl^-(aq) + Ag(s) occurs in which of the given galvanic cell.

Which of the following represent the Freundlich adsorption isotherms?




Choose the correct answer from the options given below: 

What is the purpose of adding gypsum to cement? 

Which of the following complex is octahedral, diamagnetic and the most stable?

Match List-I with List-II :

	List-I (Species)		List-II (Maximum allowed concentration in ppm in drinking water)
A	F-	I	< 50 ppm
B	\(SO^{2-}_4\)	II	< 5 ppm
C	\(NO^-_3\)	III	< 2 ppm
D	Zn	IV	< 500 ppm

Choose the correct answer from the options given below :

The correct order of spin only magnetic moments for the following complex ions is

Choose the halogen which is most reactive towards SN1 reaction in the given compounds (A, B, C & D)

The major product formed in the following reaction is

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.  
Assertion A: Butan -1- ol has higher boiling point than ethoxyethane.  
Reason R: Extensive hydrogen bonding leads to stronger association of molecules.  
In the light of the above statements, choose the correct answer from the options given below: 

Match List-I with List-II :

is reached with regents is List-I to from products in List-II.

	List-I (Reagent)		List-II (Products)
A		I
B	HBF4 \(\triangle\)	II
C	Cu, HCI	III
D	CuCN/ KCN	IV

Choose the correct answer from the options given below :

Match List-I with List-II :

	List-I		List-II
A	Saccharin	I	High potency sweetener
B	Aspartame	II	First artificial sweetening agent
C	Alitame	III	Stable at cooking temperature
D	Sucralose	IV	Unstable at cooking temperature

Choose the correct answer from the options given below :

Match List-I with List-II :

	List I (Reagents Used)		List II (Compound with Functional group detected)
A	Alkaline solution of copper sulphate and sodium citrate	I
B	Neutral FeCl3 solution	II
C	Alkaline chloroform solution	III
D	Potassium iodide and sodium hypochlorite	IV

Choose the correct answer from the options given below :

In chromyl chloride, the number of d-electrons present on chromium is same as in (Given at no. of Ti : 22, V : 23, Cr : 24, Mn : 25, Fe : 26)

In a group of 100 persons 75 speak English and 40 speak Hindi. Each person speaks at least one of the two languages. If the number of persons, who speak only English is a and the number of persons who speak only Hindi is b, then the eccentricity of the ellipse 25(β2 x² + α² y2) = α² β² is

Let $P$ be a square matrix such that $P^2 = I - P$. For $\alpha, \beta, \gamma, \delta \in \mathbb{N}$, if $P^\alpha + P^\beta = \gamma I - 29P$ and $P^\alpha - P^\beta = \delta I - 13P$, then $\alpha + \beta + \gamma - \delta$ is equal to:

If the coefficient of x⁷ in (\(ax^2 +\frac{ 1}{2bx}^{11}\)) and x^-7 in (\(ax - \frac{1}{3bx^2}^{11}\)), are euual then

\(lim _{n→∞}{(2^½-2^½)(2^½-2^½)….(2^½-^2{\frac{1}{2n+1}})}\) is equal to