Engineering Questions — JEE Main
379 solved questions with detailed explanations
Q.63. Given below are two statements : Statement (I) : 1,2,3-Trihydroxypropane can be separated from water by simple distillation. Statement (II): An azeotropic mixture cannot be separated by fraction
Q.55. Arrange the following isothermal processes in order of the magnitude of the work (p - V) involved between states 1 and 2. A. Expansion in single stage wA B. Expansion in multi stages wB C. Compr
Q.18. The number of critical points of the function in the interval is equal to:
Q.26. The density of a uniform cylinder is determined by measuring its mass , length and diameter . The measured values of and are , and , respectively. Calculated percentage fractional error in
Q.64. The total number of aromatic compounds/species from the following is [Figure: Six chemical structures]
Q.65. The following structures are [Figure: Two organic molecules, RS1 and RS2, are shown. RS1 is 1-bromo-1-chloro-2,2-dimethylcyclopropane. RS2 is 1-bromo-1-chloro-2,2-dimethylcyclopropane, but drawn
Q.59. Pairs of elements with the same number of electrons in their respective 4f orbital are [Atomic number, Eu-63, Gd-64, Dy-66, Ho-67, Tm-69, Yb-70, Lu-71, Hf-72] A. (Eu and Gd) B. (Dy and Ho) C. (Y
Q.71. The total number of unpaired electrons present in the , (low spin) (high spin), (high spin) and (low spin) octahedral complex systems is
Q.28. At t = 0, a body of mass 100 g starts moving under the influence of a force N. After 2s its position is m . The ratio x : y is
Q.40. A magnetic field vector in an electromagnetic wave is represented by, . Its associated electric field vector is
Q.37. Under steady state condition the potential difference across the capacitor in the circuit is V.
Q.69. Given below are two statements : Statement I: The correct order in terms of bond dissociation enthalpy is Cl₂ > Br₂ > F₂ > I₂. Statement II: The correct trend in the covalent character of the me
Q.68. A D-aldotetrose on oxidation with concentrated HNO₃ resulted in optically inactive dicarboxylic acid. The structure of the D-aldotetrose is :
Q.29. Three masses kg, kg and kg are suspended from a fixed smooth frictionless pully as shown in the [Figure: diagram of masses suspended by a pulley] below. The value of is ________ (take g = 10
Q.41. Two point charges q₁ = 3µC and q₂=-4µC are placed at points (2\hat{i}+3\hat{j}+3\hat{k}) and (\hat{i}+\hat{j}+\hat{k}) respectively. Force on charge q₂ is N. (Take \frac{1}{4\pi \epsilon_0} = 9×
Q.15. The square of the distance of the point of intersection of the lines , and from the origin is :
Q.43. An electromagnetic wave travelling in x-direction is described by field equation . If the electron is restricted to move in y-direction only with speed of then ratio of maximum electric and mag
Q.55. By usual analysis, 1.00g of compound (X) gave 1.79g of magnesium pyrophosphate. The percentage of phosphorus in compound (X) is: (nearest integer) (Given, molar mass in g mol: O = 16, Mg = 24, P
Q.61. Identify the correct statements from the following: (A) [Fe(C₂O₄)₃]³⁻ is the most stable complex among [Fe(OH)₆]³⁻, [Fe(C₂O₄)₃]³⁻ and [Fe(SCN)₆]³⁻. (B) The stability of [Cu(NH₃)₄]²⁺ is greater t
Q.67. The strongest conjugate acid will result from [Figure: Four conjugate acids are shown. (1) Anilinium ion (protonated aniline). (2) p-Methoxyanilinium ion. (3) p-Nitroanilinium ion. (4) p-Methyla