Engineering Questions — Physics — JEE Main

Q.44. Angular momentum of an electron in a hydrogen atom is , then the energy of the electron is _______ eV.

Q.40. For a thin symmetric prism made of glass (refractive index 1.5), the ratio of incident angle and minimum deviation will be

Q.35. Two closed vessels of same volume are joined through a narrow tube and both vessels are filled with air of pressure 90 kPa and temperature 400 K. Keeping the temperature of one vessel constant a

Q.34. A string A of length 0.314 m of Young's modulus is connected to another string B of length and Young's modulus both twice of those of A. This series combination of strings is then suspended fro

Q.38. A particle of charge q and mass m is projected from origin with an initial velocity . There exists a uniform magnetic field and a space varying electric field within the region . After travell

Q.49. In a Young's double slit experiment set up, the two slits are kept 0.4. mm apart and screen is placed at 1 m from slits. If a thin transparent sheet of thickness 20 m is introduced in front of o

Q.38. When a coil is placed in a time dependent magnetic field the power dissipated in it is P. The number of turns, area of the coil and radius of the coil wire are N, A and r respectively. For a sec

Q.38. Surface tension of two liquids (having same densities), and , are measured using capillary rise method utilizing two tubes with inner radii of and , where . The measured liquid heights in thes

Q.37. The frequency of oscillation of a mass m suspended by spring is v₁. If the length of the spring is cut to half, the same mass oscillates with frequency v₂. The value of \frac{v_2}{v_1} is

Q.50. Two masses of 3.4 kg and 2.5 kg are accelerated from an initial speed of 5 m/s and 12 m/s, respectively. The distances traversed by the masses in the second are 104 m and 129 m, respectively. T

Q.41. An insulated wire is wound so that it forms a flat coil with N = 200 turns. The radius of the innermost turn is , and of the outermost turn . If 20 mA current flow in it then the magnetic moment

Q.48. A 5 mg particle carrying a charge of 5π × 10⁻⁹ C is moving with velocity of (3\hat{i}+2\hat{k})×10²m/s in a region having magnetic field B=0.1\hat{k} Wb/m². It moves a distance of a meter along

Q.31. A solid sphere of radius 4 cm and mass 5 kg is rotating (rotation axis is passing through the centre of the sphere) with an angular velocity of 1200 rpm. It is brought to rest in 10 s by applyin

Q.38. A monochromatic source of light operating at 15 kW emits 2.5 × 10²² photons/s. The region of an electromagnetic spectrum to which the emitted electromagnetic radiation belongs to (Take h = 6.6 ×

Q.29. A capacitor C is first charged fully with potential difference of and disconnected from the battery. The charged capacitor is connected across an inductor having inductance L. In t s 25% of the

Q.46. A parallel plate capacitor is having separation between plates 0.885 mm. It has a capacitance of 1 µF when the space between the plates is filled with an insulating material of resistivity 1 × 1

Q.40. A thin convex lens and a thin concave lens are kept in contact and are co-axial. Which of the following statements is correct for this combination of two lenses?

Q.29. Two blocks (P and Q) with respectively masses 2 kg and 1.5 kg are joined by a massless thread. These blocks are mounted on a frictionless pulley which is fixed on the edge of a cube (S), as show

Q.43. A large drum having radius R is spinning around its axis with angular velocity , as shown in figure. The minimum value of so that a body of mass M remains stuck to the inner wall of the drum, t

Q.26. The density of a uniform cylinder is determined by measuring its mass , length and diameter . The measured values of and are , and , respectively. Calculated percentage fractional error in