RPSC SSO 2019 Paper Documents – Part A -Physics

RPSC Senior Scientific Officer Documents Paper 2019 Part A- Physics
Total Questions – 100 Duration – Two hours
Part A – Physics – 60 Questions

The width of one of the two slits in a Young’s double slit experiment is double of the other slit. Assuming that the amplitude of the light coming from a slit is proportional to the slit width, the ratio of maximum to the minimum intensity in the interference pattern is
(a) 34 : 1
(b) 9 : 1
(c) 4 : 1
(d) 2 : 1

The radius of 10th dark ring in Newton’s rings apparatus changes from 60 mm to 50 mm when a liquid is introduced between the lens and the plate. The refractive index of the liquid is
(a) 1.44
(b) 1.20
(c) 1.55
(d) 1.66

In michelson interferometer 100 fringes cross the field of view when the movable mirror is displaced through 0.03000 mm. The wavelength of monochromatic light used is
(a) 3000 angstrom
(b) 6000 angstrom
(c) 1500 angstrom
(d) 4000 angstrom

A solenoid of inductance 50 mH and resistance 10 Ohms is connected to a battery of 6 V. The time elapsed before the current acquires half its steady value is nearly
(a) 5 ms
(b) 12.5 ms
(c) 3.5 ms
(d) 10 ms

If the frequency of light in a photo-electric experiment is doubled, the stopping potential will
(a) be doubled
(b) be halved
(c) become more than double
(d) become less than double

An x-ray tube operates at 20 kV. A particular electron loses 5% of its kinetic energy to emit an x-ray photon at the first collision with target. The wavelength of this photon is
(a) 12.4 nm
(b) 1.24 nm
(c) 124 nm
(d) 1240 nm

If the peak output voltage of a full wave rectifier is 10 V, its de voltage is
(a) 10 V
(b) 7.07 V
(c) 6.36 V
(d) 3.18 V

In a transistor
(a) the emitter is most lightly doped.
(b) the collector is most lightly doped
(c) the base is most lightly doped
(d) all the three regions have equal amount of doping.

An example of an interial reference frame is
(a) any reference frame that is not rotating
(b) a frame attached to a particle on which there are no forces
(c) any reference frame that is at rest
(d) a reference frame attached to earth.

A block of mass 5 kg executes simple harmonic motion under the restoring force of a spring. The amplitude and the time period of motion are 0.1 m and pie(22/7)s respectively. The maximum force exerted by the spring on the block is
(a) 4N
(b) 3N
(c) 2N
(d) 1N