Engineering Questions — JEE Main

Q.27. The diameter of a wire measured by a screw gauge of least count cm is cm. The length measured by a scale of least count cm is cm. When a weight of N is applied to the wire, the extension in

Q.8. The mean deviation about the mean for the data [Figure: Data table with x and f values] is equal to :

Q.27. In an experiment to determine the resistance of a given wire using Ohm's law, the voltmeter and ammeter readings are noted as 10V and 5 A, respectively. The least counts of voltmeter and ammeter

Q.5. The value of is:

Q.8. If , then a is equal to :

Q.45. A LCR series circuit driven with V at frequency Hz has resistance \Omega, an inductance with inductive reactance \Omega and capacitance with capacitive reactance \Omega. The power factor of

33. Eight mercury drops, each of radius r, coalesce to form a bigger drop. The surface energy released in this process is ______ (S is the surface tension of mercury).

Q.6. Let tan A, tan B, where , be the roots of the quadratic equation . Then is equal to :

Q.36. A metal rod of length L rotates about on end at origin with a uniform angular velocity . The magnetic field radially falls off as ; being a positive constant. The emf induced (neglecting the ce

Q.56. When 0.25 moles of a non-volatile, non-ionizable solute was dissolved in 1 mole of a solvent the vapor pressure of solution was x% of vapor pressure of pure solvent. What is x% ?