Engineering Questions — JEE Main
409 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.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.30. A wheel initially at rest is subjected to a uniform angular acceleration about its axis. In the first 2 s it rotates through an angle . In the next 2 s it rotates through an angle . The ratio i
Q.3. If the system of linear equations : , , . has infinitely many solutions, then the value of equals.
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