Engineering Questions — JEE Main
379 solved questions with detailed explanations
Q.70. On heating a mixture of common salt and K₂Cr₂O₇ in equal amount along with concentrated H₂SO₄ in a test tube, a gas is evolved. Formula of the gas evolved and oxidation state of the central meta
Q.50. Two masses of 3.4 kg and 2.5 kg are accelerated from an initial speed of 5 m/s and 12 m/s, respectively. The distances traversed by the masses in the second are 104 m and 129 m, respectively. T
Q.62. Match List - I with List - II. List - I: Chromium (III) Complexes (en = ethylene diamine) A. [Cr(CN)₆]³⁻ B. [CrF₆]³⁻ C. [Cr(H₂O)₆]³⁺ D. [Cr(en)₃]³⁺ List - II: (cm⁻¹) I. 15,060 II. 17,400 III. 2
Q.41. An insulated wire is wound so that it forms a flat coil with N = 200 turns. The radius of the innermost turn is , and of the outermost turn . If 20 mA current flow in it then the magnetic moment
Q.48. A 5 mg particle carrying a charge of 5π × 10⁻⁹ C is moving with velocity of (3\hat{i}+2\hat{k})×10²m/s in a region having magnetic field B=0.1\hat{k} Wb/m². It moves a distance of a meter along
Q.30. A wedge Y with mass of 10 kg and all frictionless surfaces and the inclined surface making 37° with horizontal. A block X with mass 2 kg is placed at the highest point of the wedge as shown in [
Q.20. The integral is equal to :
Q.31. A solid sphere of radius 4 cm and mass 5 kg is rotating (rotation axis is passing through the centre of the sphere) with an angular velocity of 1200 rpm. It is brought to rest in 10 s by applyin
Q.62. The correct order of the rate of the reaction for the following reaction with respect to nucleophiles is: CHBr + Nu CHNu + Br
Q.38. A monochromatic source of light operating at 15 kW emits 2.5 × 10²² photons/s. The region of an electromagnetic spectrum to which the emitted electromagnetic radiation belongs to (Take h = 6.6 ×
Q.66. Given below are two statements : Statement-I : Due to increase in van der Waals forces, the order of boiling points is . Statement-II: As [Figure: 1,4-dichlorobenzene] is more symmetric, its mel
Q.61. Consider the following molecules/species: [Figure: Three organic molecules labeled (x), (y), and (z). (x) is CH₃-C(=O)-CH₃ (acetone). (y) is CH₃-C(=O)-O⁻ (acetate ion). (z) is CH₃-C(=O)-H (aceta
Q.29. A capacitor C is first charged fully with potential difference of and disconnected from the battery. The charged capacitor is connected across an inductor having inductance L. In t s 25% of the
Q.46. A parallel plate capacitor is having separation between plates 0.885 mm. It has a capacitance of 1 µF when the space between the plates is filled with an insulating material of resistivity 1 × 1
Q.40. A thin convex lens and a thin concave lens are kept in contact and are co-axial. Which of the following statements is correct for this combination of two lenses?
Q.58. Consider the following data : Electrolyte | (S cm mol) BaCl | x HSO | x HCl | x BaSO is sparingly soluble in water. If the conductivity of the saturated BaSO solution is x S cm then the solubil
Q.29. Two blocks (P and Q) with respectively masses 2 kg and 1.5 kg are joined by a massless thread. These blocks are mounted on a frictionless pulley which is fixed on the edge of a cube (S), as show
Q.43. A large drum having radius R is spinning around its axis with angular velocity , as shown in figure. The minimum value of so that a body of mass M remains stuck to the inner wall of the drum, t
Q.75. At the transition temperature T, A B and where A and B are two states of substance X. The transition temperature in °C when pressure is 1 atm is _________ (Nearest integer)
Q.60. Given below are two statements : Statement-I : Presence of large number of unpaired electrons in transition metal atoms results in higher enthalpies of their atomisation. Statement-II : and ar