RPSC Senior Scientific Officer Ballistic Paper 2019 – Part A Physics
Total Questions – 100 Duration – Two hours
No. of questions from Physics – 60 Nos.
A spring of spring constant k is cut into two parts such that their lengths are in the ratio 1:3, then the spring constant of larger spring will be
(a) k/3
(b) 4k
(c) 4k/3
(d) 3k/4
A closed pipe and an open pipe have their first overtones identical in frequency. Their lengths are in the ratio
(a) 4:5
(b) 3:4
(c) 2:3
(d) 1:2
At what speed should a source of sound must move, so that frequency of sound heard by stationary observer is half of original frequency?
(a) 2 v
(b) v
(c) v/2
(d) v/3
Where v is velocity of sound in air.
Two sources are called coherent if they produce waves
(a) of equal wavelength
(b) of equal amplitude
(c) having some shape of wave front
(d) having a constant phase difference with time
A coil of inductance 300 mH and resistance 2 Ohms is connected to a source of voltage 2V. The current reaches half of its steady state value in
(a) 0.3 s
(b) 0.2 s
(c) 0.1 s
(d) 0.05 s
The bandwidth of the series resonant circuit is 500 Hz and the resonant frequency is 5000 Hz. The quality factor of the circuit will be
(a) 40
(b) 20
(c) 10
(d) 05
For plane electromagnetic waves in free space, the value of intrinsic impedance will be
(a) 177 Ohms
(b) 277 Ohms
(c) 377 Ohms
(d) 477 Ohms
The pumping method, which is used in Ruby laser is
(a) Electron impact
(b) Optical pumping
(c) Radio frequency radiation pumping
(d) Chemical pumping
In photoelectric equation, the slope of graph between stopping potential and frequency of radiation depends upon
(a) Intensity of radiation
(b) Nature of material
(c) Time of irradiation
(d) It is universal constant
In dispersive medium for normal dispersion
(a) The refractive index decreases as wavelength increase.
(b) The refractive index increases as wavelength increase.
(c) The refractive index change indefinitely as wavelength increase.
(d) The refractive index does not change as wavelength increase.
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