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HSSC Senior Scientific Assistant/Dt.-31-12-2022 Morning Shift (Cat. No.-3,4,9)
📆 December 17, 2024
Total Questions: 100
31.
When X-rays emitted from molybdenum are allowed to pass through a zirconium filter, which of the following occurs?
(a) It absorbs radiation of shorter wavelength
(b) It absorbs radiation of longer wavelength
(c) It allows radiation of shorter wavelength to intensify
(d) It allows radiation in a particular band to pass through
Correct Answer:
(b) It absorbs radiation of longer wavelength
32.
The ballistic coefficient of a projectile is where, M = Mass of projectile, Cd = Coefficient of drag, A = Cross-sectional area of projectile
(a) M / CdA
(b) A / CdM
(c) Cd / MA²
(d) M / 2CdA
Correct Answer:
(a) M / CdA
33.
The angle of rifling (θ), pitch of rifling (l), and calibre of rifle (d) are connected by which of the following relations?
(a) d = l / (π * tan θ)
(b) d = l / (π * cot θ)
(c) l = d / (π * tan θ)
(d) l = d / (π * sin θ)
Correct Answer:
(a) d = l / (π * tan θ)
34.
In recoil-operated firearms like a pistol, the automatic mechanism works because of
(a) force of recoil of firearm
(b) force of recoil acting on the recoil plate of firearm
(c) force of recoil acting on the head of the cartridge case
(d) force of recoil acting on walls and neck of cartridge case
Correct Answer:
(d) force of recoil acting on walls and neck of cartridge case
35.
The range of fire can be determined by
(a) the size of wound
(b) the position of gun at the scene of crime
(c) the dispersion pellet
(d) the shape of wound
Correct Answer:
(c) the dispersion pellet
36.
Exit wound of gunshot injury contains
(a) signs of burning
(b) blackening
(c) tattooing
(d) None of the above
Correct Answer:
(d) None of the above
37.
For wound ballistics study in human beings, which of the following is used in experiments?
(a) 10% gelatin gel block
(b) 20% gelatin gel block
(c) 10% agar gel block
(d) 20% starch gel block
Correct Answer:
(b) 20% gelatin gel block
38.
In paper chromatography, if a = distance travelled by the component and b = distance travelled by the solvent, then the retention factor value is-
(a) a / (2b)
(b) b / (2a)(c) a / b
(d) b / a
Correct Answer:
(a) a / (2b)
39.
In Reverse Phase Chromatography (RPC), the stationary phase is-
(a) polar
(b) non-polar
(c) either polar or non-polar
(d) None of the above
Correct Answer:
(b) non-polar
40.
The separation technique involving the movement of charged particles through a matrix under the influence of an applied electric field is called:
(a) Electrophoresis
(b) Electrolysis
(c) Chromatography
(d) Syng's triangle
Correct Answer:
(a) Electrophoresis
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