List of top Questions asked in JEE Main- 2023

The trajectory of projectile, projected from the ground is given by y=x-x²/20. Where x and y are measured in meter. The maximum height attained by the projectile will be

For a given transistor amplifier circuit in CE configuration V_CC = 1 V, R_c = 1 kΩ, R_b = 100 kΩ and β = 100. Value of base current I_b is

A radio active material is reduced to 1/8 of its original amount in 3 days.
If 8×10^-3 kg of the material is left after 5 days the initial amount of the material is

In photo electric effect
A. The photocurrent is proportional to the intensity of the incident radiation.
B. Maximum Kinetic energy with which photoelectrons are emitted depends on the intensity of incident light.
C. Max. K.E with which photoelectrons are emitted depends on the frequency of incident light.
D. The emission of photoelectrons require a minimum threshold intensity of incident radiation.
E. Max. K.E of the photoelectrons is independent of the frequency of the incident light.
Choose the correct answer from the options given below:

The width of fringe is 2 mm on the screen in a double slits experiment for the light of wavelength of 400 nm. The width of the fringe for the light of wavelength 600 nm will be:

An emf of 0.08 V is induced in a metal rod of length 10 cm held normal to a uniform magnetic field of 0.4 T, when moves with a velocity of:

A guitar string of length 90 cm vibrates with a fundamental frequency of 120 Hz. The length of the string producing a fundamental frequency of 180 Hz will be _______ cm.

A steel rod of length 1 m and cross sectional area 10^-4 m² is heated from 0°C to 200°C without being allowed to extend or bend. The compressive tension produced in the rod is______ ×10⁴N. (Given Young's modulus of steel = 2×10¹¹ Nm^-2, coefficient of linear expansion = 10^-5K^-1)

A hollow spherical ball of uniform density rolls up a curved surface with an initial velocity 3 m/s (as shown in figure). Maximum height with respect to the initial position covered by it will be_____ cm (take, g = 10 m/s²)

A 600 pF capacitor is charged by 200 V supply. It is then disconnected from the supply and is connected to another uncharged 600 pF capacitor. Electrostatic energy lost in the process is _____ μ.J

Two transparent media having refractive indices 1.0 and 1.5 are separated by a spherical refracting surface of radius of curvature 30 cm. The centre of curvature of surface is towards denser medium and a point object is placed on the principle axis in rarer medium at a distance of 15 cm from the pole of the surface. The distance of image from the pole of the surface is _____ cm.

A series combination of resistor of resistance 100 Ω, inductor of inductance 1 H and capacitor of capacitance 6.25 µF is connected to an ac source. The quality factor of the circuit will be ______

The number density of free electrons in copper is nearly 8 × 10²⁸ m^-3. A copper wire has its area of cross section = 2 × 10^-6 m² and is carrying a current of 3.2 A. The drift speed of the electrons is _____ ×10^-6 ms^-1

Which of the following have same number of significant figures?
A. 0.00253
B. 1.0003
C. 15.0
D. 163
Choose the correct answer from the options given below

Arrange the following gases in increasing order of van der Waals constant 'a'
A. Ar
B. CH4
C. H₂O
D. C6H6
Choose the correct option from the following.

The correct reaction profile diagram for a positive catalyst reaction .

Henry Moseley studied characteristic X-ray spectra of elements. The graph which represents his observation correctly is
Given v = frequency of X-ray emitted
Z = atomic number

In Hall - Heroult process, the following is used for reducing Al₂O₃ :-

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R
Assertion A : Sodium is about 30 times as abundant as potassium in the oceans.
Reason R : Potassium is bigger in size than sodium.
In the light of the above statements, choose the correct answer from the options given below

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:

Which of these reactions is not a part of breakdown of ozone in stratosphere?

Major product 'P' formed in the following reaction is:

The correct order of reactivity of following haloarenes towards nucleophilic substitution with aqueous NaOH is 

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The descending order of acidity for the following carboxylic acid is-
A. CH₃COOH
B. F₃C-COOH
C. CICH₂-COOH
D. FCH₂-COOH
E. BrCH₂-COOH
Choose the correct answer from the options given below: