RSMSSB Junior Scientific Assistant Documents Paper 2019

RSMSSB JSA Documents Paper 2019
Date of Exam – 22nd Sept 2019

Photons of energy 5.5 eV fall on the surface of the metal emitting photo electron of maximum kinetic energy 4.0 eV. The stopping voltage required for these electrons is
(a) 5.5 V
(b) 4.0 V
(c) 1.5 V
(d) 9.5 V

If the momentum of a particle is doubled, then its de-broglie wavelength will
(a) remain unchanged
(b) become four times
(c) become two times
(d) become half

Paralysis time in Geiger Muller Counter reduced by self quenching method which uses following quenching agent
(a) Ethyl alcohol
(b) Argon
(c) Oxygen
(d) Oxygen Carbon dixoide

Quadrupole moment of nucleus having spherical symmetric charge distribution is
(a) 0
(b) 1
(c) -1
(d) infinity

Two circular discs have masses in the ratio 1 : 2 and diameter in the ratio 2 : 1. The ratio of their moment of inertia is
(a) 1 : 2
(b) 2 : 1
(c) 4 : 1
(d) 8 : 1

Meson theory of nuclear force was proposed by
(a) Raman
(b) Fermi
(c) Bhabha
(d) Yukawa

Bulk Modulus of elasticity (K) is defined as
(a) K= Tangential stress/Shear strain
(b) K= Normal stress/ Volume strain
(c) K= Longitudinal stress/ Logitudinal strain
(d) K= Logitudinal stress/ Shear strain

If a liquid does not wet glass, its angle of contact is
(a) zero
(b) acute angle
(c) obtuse angle
(d) right angle

The efficiency of a Carnot engine is 50% and temperature of sink is 500 K. If temperature of source is kept constant and its efficiency is rased to 60%, then the required temperature of the sink will be –
(a) 100 K
(b) 400 K
(c) 500 K
(d) 600 K

A battery of 16 V and internal resistance 2 Ohm is connected to an external resistance ‘R’. The value of the current for which power in circuit is maximum, is
(a) 8 Amperes
(b) 2 Amperes
(c) 4 Amperes
(d) 16 Amperes

Which of the following is referred to as the brain of computer?
(a) Processor
(b) Memory
(c) Keyboard
(d) Motherboard

ROM stands for
(a) Read only memory
(b) Random only memory
(c) Read only management
(d) None of these