JAM PH Question Paper 2020 Download Free PDF
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Q.1 A collimated beam of laser light of wavelength 514 nm is normally incident on a smooth glass slab placed in air. Given the refractive indices of glass and air are 1.47 and 1.0, respectively, the percentage of light intensity reflected back is
Q.2 Two stationary point particles with equal and opposite charges are at some fixed distance from each other. The points having zero electric potential lie on:
(A) A sphere
(B) A plane
(C) A cylinder
(D) Two parallel planes
Q.3 In a photoelectric effect experiment, a monochromatic light source emitting photons with energy greater than the work function of the metal under test is used. If the power of the light source is doubled, which one of the following statements is correct?
(A) The number of emitted photoelectrons remains the same.
(B) The stopping potential remains the same.
(C) The number of emitted photoelectrons decreases.
(D) The stopping potential doubles.
Q.4 For a particle moving in a central potential, which one of the following statements is correct?
(A) The motion is restricted to a plane due to the conservation of angular momentum.
(B) The motion is restricted to a plane due to the conservation of energy only.
(C) The motion is restricted to a plane due to the conservation of linear momentum.
(D) The motion is not restricted to a plane.
Q.5 Two objects of masses m and 2m are moving at speeds of 𝑣 and 𝑣/2, respectively. After undergoing a completely inelastic collision, they move together with a speed of 𝑣/3. The angle between the initial velocity vectors of the two objects is