Engineering Questions — Physics — JEE Main
138 solved questions with detailed explanations
Q.28. The rain drop of mass 1 g, starts with zero velocity from a height of 1 km. It hits the ground with a speed of 5 m/s. The work done by the unknown resistive force is ________ J. (take )
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.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.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.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.47. Some distance star is to be observed by some telescope of diameter of objective lens , at an angular resolution of radian. If the wavelength of light from the star reaching the telescope is 500
Q.43. In Rutherford's alpha-particle scattering experiment, only a few alpha particles rebound back because (A) The size of gold nucleus is very small as compared to the size of gold atom. (B) Alpha p
Q.28. The velocity of a particle is given as . The magnitude of acceleration at point is ____ .
Q.47. The terminal velocity of a metallic ball of radius 6 mm in a viscous fluid is 20 cm/s. The terminal velocity of another ball of same material and having radius 3 mm in the same fluid will be ...