RPSC Senior Scientific Officer Physics Paper 2019
Total Questions – 100 Duration – Two hours
A tunning fork of frequency 512 Hz makes 4 beats per second with the vibrating string of a Sitar. The beat frequency decreases to 2 beats per second when the tension in the Sitar string is slightly increase. The frequency of Sitar string before increasing the tension was –
(a) 510 Hz
(b) 514 Hz
(c) 516 Hz
(d) 508 Hz
In an experiment with a Michelson interferometer the distance travelled by the moveable mirrior for two successive positions of maximum distinctness was 0.2945 mm. If the mean wavelength for the two components of sodium is 5893 Angstrom the difference between them is
(a) 2 Angstrom
(b) 4 Angstrom
(c) 6 Angstrom
(d) 9 Angstrom
In Young’s Double slit experiment using monochromatic light the fringe pattern shifts by a certain distance on the screen when a mica sheet of refractive index 1.6 and thickness 2.0 microns is introduced in the path of one of the interfering waves. The mica sheet is then removed and the distance between the slits and screen is doubled. It is found that the distance between now is same as observed fringe shfit upon the introduction of mica sheet. The wavelength of the monochromatic light used in the experiment is
(a) 400 nm
(b) 600 nm
(c) 750 nm
(d) 800 nm
When a photon stimulates the emission of another photon the two photons have
(a) same energy, same direction, same phase, same frequency
(b) same energy, same direction, same phase, different frequency
(c) same energy, same direction, different phase, same frequency
(d) same energy, different direction, same phase, same frequency
Find the wavelength present in the radiation emitted when hydrogen atoms excited on n=3 states return to their ground state (Given hC=1242 eV nm)
(a) 365 nm, 487 nm only
(b) 365 nm, 97.5 nm only
(c) 103 nm, 122 nm, 654 nm only
(d) 103 nm, 365 nm, 487 nm only
Light corresponding to the transition n=4 to n=2 in hydrogen atoms falls on a metal (work function = 1.9 eV) Them maximum kinetic energy of the photoelectrons emitted is
(a) 2.55 eV
(b) 0.65 eV
(c) 0.85 eV
(d) No photoelectric effect takes place
In S band of game crystal the energy of an electron is given by E=E’-2A cos ka (E’ and A are constant). The energy width of the band is
(a) zero
(b) A
(c) 2A
(d) 4A
The succeptibility of a diamagnetic material is
(a) positive and varies exponentially with temperature
(b) negative and independent of external magnetic field
(c) negative and depends on external magnetic field
(d) positive and independent of temperature
In a p-n junction concentration on the p side is higher then that on n side. Which of the following statements is NOT correct.
(a) the width of depletion layer is larger on the n side
(b) at thermal equilibrium the Fermi energy is higher on the p side
(c) in the depletion region number of negative immobile charges per unit area on the p side is equal to the number of positive immobile charges per unit area on the n side.
(d) the value of barrier potential depends on the dopant concentrations.
A block of mass 2 kg moving at a speed of 20 cm/s. collides head on with another 2 kg. block at rest initially. The coefficient of restitution is 3/5. The loss of kinetic energy in collision
(a) 0.0128 J
(b) 0.0256 J
(c) 0.0384 J
(d) 0.0512 J
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