Engineering Questions — Jee Main
379 solved questions with detailed explanations
Q.47. A gun mounted on the ground fires bullets in all directions with same speed. The farthest distance the bullets could reach is 6.4 m. The speed of the bullets from the gun is __________ m/s. (tak
Q.65. n-Butane on monochlorination under photochemical conditions gives an optically active compound "P". “P” on further chlorination gives dichloro compounds. The number of dichloro compounds obtaine
Q.3. Let be such that the system of linear equations , , has no solution. Then is equal to :
Q.45. In a semiconductor p-n diode, the doping concentrations on p-side and n-side are atoms/cm³ and atoms/cm³, respectively. Which one of the following statement is true?
Q.31. A metal string A is suspended from a rigid support and its free end is attached to a block of mass M. Second block having mass 2M is suspended at the bottom of the first block using a string B.
Q.65. In IUPAC nomenclature, the correct order of decreasing priority of functional group is :
Q.70. Match the LIST-I with LIST-II List-I Compound A. [Figure: Phenol] B. [Figure: Aniline] C. [Figure: Acetaldehyde] D. [Figure: Alcohol (Ethanol)] List-II Test I. Hinsberg's reagent test II. Phthal
Q.48. A series LCR circuit with , H and is connected to a variable frequency a.c. source. The inductive reactance at resonant frequency is .
Q.42. Light ray incident along a vector AO(AO=2\hat{i}-3\hat{j}) emerges out along vector OB(OB=C\hat{i}-4\hat{j}) as shown in the figure below. The value of C is
Q.38. Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : In electrostatics, a conductor does not store any net charge inside. Reason R
Q.23. Let A, B be points on the two half-lines x-, a > 0 at a distance of a from their point of intersection P. The line segment AB meets the angle bisector of the given half-lines at the point Q. If
Q.39. A river of width 200 m is flowing from west to east with a speed of 18 km/h. A boat, moving with speed of 36 km/h in still water, is made to travel one-round trip (bank to bank of the river). Mi
Q.14. If and are two vectors such that and , then the maximum value of is :
Q.8. If the mean of the data Class: 5-10, 10-15, 15-20, 20-25, 25-30, 30-35 Frequency: 2, k, 28, 54, k+1, 5 is 21, then k is one of the roots of the equation :
Q.21. If the domain of the function is , then the value of is
Q.35. One gas of mole of molecules at temperature , volume , and pressure , and another gas of mole of molecules at temperature , volume , and pressure , are mixed resulting in pressure P and volume
Q.43. An electron is travelling with a velocity v in free space and when it enters a medium, its velocity is reduced by 20%. The de Broglie wavelength of electron in the medium is , where is its de B
Q.42. The maximum intensity in a Young's double slit experiment is . Distance between the slits (d) is , where is the wavelength of light used. The intensity of the fringe, exactly opposite to one of
Q.36. An ideal gas undergoes a process maintaining relation between pressure (P) and volume (V) as , where and are constants. If two samples A and B (two moles each) with initial volume and respec
Q.66. For the given molecule, "x", the preferred site for the attack of the electrophile is : [Figure: A molecule with a benzene ring substituted with a nitrogen-containing group and a carbonyl group.