Engineering Questions — JEE Main
379 solved questions with detailed explanations
Q.58. is the time required for the 100% completion of the reaction while is the time required for 50% of the reaction to be completed. Which of the following option correctly represents the relation
Q.37. A spherical body of radius r and density falls freely through a viscous liquid having density and viscosity and attains a terminal velocity . Estimated maximum error in the quantity is : (Ig
Q.73. 4.7 g of phenol is heated with Zn to give product X. If this reaction goes to 60% completion then the number of moles of compound X formed will be ______ 10 (Nearest Integer) (Given molar mass
Q.40. A point light source emits E.M. waves in free space. A detector, placed at a distance of L m, measures the intensity as . The detector is now shifted to another location on the same spherical su
Q.64. Given below are two statements : Statement (I) : Benzyl chloride reacts faster in S1 mechanism than ethyl chloride. Statement (II) : Ethyl carbocation intermediate is less stabilized by hypercon
Q.56. Match the LIST-I with LIST-II List-I Reaction A. Williamson Synthesis B. Friedel Craft Reaction C. Bromination of vinyl benzene D. Chlorination of toluene in light List-II Mechanism I. Electroph
Q.68. Arrange the following compounds according to increasing order of boiling points. n-CHOH (A), n-CHNH (B), n-CH (C) and CHNHCH (D).
Q.56. Given at 298 K: The in Volt at 298 K is given by :
Q.51. Match List-I with List-II. List-I (Mass of substance) A. 1.8 mg water B. 9.8 mg sulphuric acid C. 1.8 mg carbon D. 5.85 mg salt (NaCl) List-II (Number of atoms) I. II. III. IV. Choose the co
Q.65. Given below are four compounds: (a) n-propyl chloride (b) iso-propyl chloride (c) sec-butyl chloride (d) neo-pentyl chloride Percentage of carbon in the one which exhibits optical isomerism is:
Q.41. A convex lens is made from glass material having refractive index of 1.4 with same radius of curvature on both sides. The ratio of its focal length and radius of curvature is
Q.67. For a closed circuit Daniell cell, which of the following plots is the accurate one at a given temperature? [Figure: Four graphs of E°cell vs time]
Q.52. The species having identical radii according to the Bohr's theory are : A. H (first orbit) B. He (first orbit) C. He (second orbit) D. Li (first orbit) E. Be (Second orbit) Choose the correct an
Q.54. Which of the following are not correct? A. For water, magnitude of is more than the magnitude of . B. The elevation in boiling point of water when a non-volatile solute is added to it is larger
Q.17. The product of all possible values of , for which , is :
Q.35. The equation of a plane progressive wave is given by where x and y are in cm and t is in second. The velocity of the wave is _______ m/s
Q.70. Match the List-I with List-II List-I: Amino acid (A) Glutamine (B) Lysine (C) Tyrosine (D) Serine List-II: Positive reaction/Test for functional group present in side chain of amino acid I. Hins
Q.63. The major product of which of the following reaction is not obtained by rearrangement reaction? [Figure: Four reaction schemes with reactants and products]
Q.54. Aqueous HCl reacts with MnO(s) to form MnCl(aq), Cl(g) and HO(l). What is the weight (in g) of Cl liberated when 8.7 g of MnO(s) is reacted with excess aqueous HCl solution ? (Given Molar mass i
Q.5. Let A be the set of first 101 terms of an A.P., whose first term is 1 and the common difference is 5 and let B be the set of first 71 terms of an A.P., whose first term is 9 and the common differ