Engineering Questions — JEE Main

Q.57. One mole each of He and A(g) are taken in a 10 L closed flask and heated to 400 K to establish the following equilibrium. A(g) B(g) K for this reaction at 400 K is 4.0. The partial pressures (i

Q.66. Given below are some of the statements about Mn and Mn₂O₇. Identify the correct statements A. Mn forms the oxide Mn₂O₇ in which Mn is in its highest oxidation state. B. Oxygen stabilizes the Mn

Q.38. A thin half ring of radius 35 cm is uniformly charged with a total charge of Q coulomb. If the magnitude of the electric field at centre of the half ring is 100 V/m, then the value of Q is ____

Q.58. Decomposition of A is a first order reaction at T(K) and is given by A(g) → B(g) + C(g). In a closed 1 L vessel, 1 bar A(g) is allowed to decompose at T(K). After 100 minutes, the total pressure

Q.59. Given below are two statements : Statement-I : Aluminium upon reaction with NaOH forms [Al(OH)₄]⁻ ion. Statement-II : The geometry of ICl₂, ClO₃⁻ and IBr₂⁻ is square planar, pyramidal and linear

Q.46. Refer to the circuit diagram given below. The heat generated across the 6 resistance in 100 second is J. The value of is ________ (Nearest integer)

Q.46. In single slit diffraction pattern, the wavelength of light used is 628 nm and slit width is 0.2 mm, the angular width of central maximum is degrees. The value of is _______.

Q.32. A smooth inclined plane ends in a vertical circular loop, as shown in the figure. A small body is released from height as shown. If the body exerts a force of three times its weight on the plan

Q.63. Consider the given graph showing variation of reactant concentration with time. Three different reactions were started with identical initial concentration of reactants. Which of the following s

Q.52. Given below are two statements : Given : Molar mass of C, H, O, Cl are 12, 1, 16 and 35.5 g mol⁻¹, respectively. Statement I : In 30%(w/w) solution of methanol in CCl₄ (at T K), the mole fractio

Q.64. Compound (X) is subjected to the sequence of reactions as shown above. Molar mass of the major product (Y) formed is ______ gmol⁻¹. (Given molar mass in g mol⁻¹ C : 12, H : 1, O : 16) [Figure: R

Q.35. A uniform disc of radius R and mass M is free to oscillate about the axis A as shown in the figure. For small oscillations the time period is __________. (g is acceleration due to gravity) [Figu

Q.21. Let satisfy for some . Then is equal to ________.

Q.61. Given below are two statements for catalytic properties of transition metals : Statement I: First row transition metals which act as catalyst utilise their 3d electrons only for formation of bon

Q.18. Let , , be a A. P. and be the minimum value of . Then the value of the integral is:

Q.67. Consider the following sequence of reactions [Figure: Reaction scheme starting with phenol, reacting with (i) Cu/573 K, (ii) H, PhCOOH to give product P]. The major product P is :

Q.36. Two short electric dipoles A and B having dipole moment and respectively are placed with their axis mutually perpendicular as shown in the figure. The resultant electric field at a point x is

Q.62. Given below are two statements : Statement I: Vapours of the liquid with higher boiling point condense before vapours of the liquid with lower boiling points in fractional distillation. Statemen

Q.42. An unpolarized light of certain intensity passes through a combination of two polarizers whose transmission axes are at and , respectively, with respect to the horizontal axis. A third polarize

Q.71. First and second ionization enthalpies of lithium are 520 kJ mol and 7297 kJ mol respectively. Energy required to convert 3.5 mg lithium (g) into Li(g) [Li(g) Li(g)] is ______ kJ mol. (nearest