JEE Main questions
34568 published questions with worked solutions.
- The work function of a substance is 3.0 eV. The longest wavelength of light that can cause the emission of photoelectrons from...
- The diffraction pattern of a light of wavelength 400 nm diffracting from a slit of width 0.2 mm is focused on the focal plane of...
- Match List-I with List-II. List-I: (A) Coefficient of viscosity, (B) Surface tension, (C) Angular momentum, (D) Rotational...
- A series L.R circuit connected with an ac source E = (25 sin 1000 t) V has a power factor of 1/√2. If the source of emf is...
- Young's modulus of material of a wire of length 'L' and cross-sectional area A is Y. If the length of the wire is doubled and...
- At which temperature the r.m.s. velocity of a hydrogen molecule equal to that of an oxygen molecule at 47° C?
- The gravitational potential at a point above the surface of earth is – 5.12 × 10⁷ J/kg and the acceleration due to gravity at...
- The electric field of an electromagnetic wave in free space is represented as E = E_0 ( t - kz) i. The corresponding magnetic...
- The distance between object and its two times magnified real image as produced by a convex lens is 45 cm. The focal length of the...
- A capacitor of capacitance C and potential V has energy E. It is connected to another capacitor of capacitance 2C and potential...
- In a closed organ pipe, the frequency of fundamental note is 30 Hz. A certain amount of water is now poured in the organ pipe so...
- The horizontal component of earth's magnetic field at a place is 3.5 × 10⁻⁵ T. A very long straight conductor carrying current of...
- The displacement and the increase in the velocity of a moving particle in the time interval of t to (t + 1) s are 125 m and 50...
- A ceiling fan having 3 blades of length 80 cm each is rotating with an angular velocity of 1200 rpm. The magnetic field of earth...
- Given below are two statements. Statement (I) : The gas liberated on warming a salt with dil H₂SO₄, turns a piece of paper dipped...
- In the given reactions, identify the reagent A and reagent B. Toluene → ["A" + (CH₃CO)₂O, 273–283 K] → [Intermediate] → H₃O⁺, Δ →...
- Match List-I with List-II. List-I (Species): (A) Cr²⁺, (B) Mn⁺, (C) Ni²⁺, (D) V⁺ List-II (Electronic distribution): (I) 3d⁸, (II)...
- Sugar which does not give reddish brown precipitate with Fehling's reagent, is
- Match List-I with List-II. List-I (Molecule): (A) BrF₅, (B) H₂O, (C) ClF₃, (D) SF₄ List-II (Shape): (I) T-shape, (II) See saw,...
- Compound A formed in the following reaction reacts with B gives the product C. Find out A and B. CH₃–C≡CH + Na → A →(B)...