RSMSSB Junior Scientific Assistant Physics Paper 2019

RSMSSB JSA Physics Paper 2019
Date of Exam – 21st Sept 2019

A mass suspended to a spring has time period T. If spring is cut into two parts and now same mass is suspended to one part of the spring, then what will be the new time period?
(a) 0.302 T
(b) T
(c) 0.707 T
(d) 0.5 T

An oscillator of frequency 200 Hz has damping coefficient 0.23 per second, then what is relaxation time?
(a) 1.6 second
(b) 2.17 second
(c) 1.26 second
(d) 5.0 second

If the distance between two charges is reduced to half, then the force between them will be
(a) the same
(b) doubled
(c) tripled
(d) quadrupled

The lens used in Netwon’s ring is
(a) Planoconvex lens
(b) Planoconcave lens
(c) Double convex lens
(d) Double concave lens

Wavelength of He-Ne Laser is
(a) 4238 angstrom
(b) 5328 angstrom
(c) 6328 angstrom
(d) 7000 angstrom

100 fringes are found shifted from vision region when moving mirror of Michelson interferometer is moved by a distance 0.03mm. The wavelength of light used is
(a) 4000 angstrom
(b) 5500 angstrom
(c) 3000 angstrom
(d) 6000 angstrom

Which one of the following is not a lepton?
(a) Electron
(b) Nutrino
(c) Muon
(d) Pion

The main function of moderators in a nuclear rector is
(a) to cool the reactor
(b) to slow down high energy neutron
(c) to distribute energy
(d) to distribute mass

The value of the atomic radii of a bcc crystal of lattice constant 4.889 angstrom will be
(a) 1.117 angstrom
(b) 2.117 angstrom
(c) 3.117 angstrom
(d) 4.117 angstrom

X-rays of wavelength 1.3 angstrom are diffracted in a Bragg spectrometer at an angle of 30 degree for second order. The spacing between the atomic planes of the crystals is
(a) 2.6 angstrom
(b) 1.6 angstrom
(c) 5.6 angstrom
(d) 3.2 angstrom