BPSC – Combined Competitive Examination · प्रश्न 10
In the context of lab-grown diamonds (LGDs), what is used as the starting carbon material ('seed')?
उत्तर दाखवा आणि स्पष्टीकरण
उत्तर: (C) Graphite
स्पष्टीकरण
Lab-grown diamonds must start from carbon; in the HPHT method graphite is the carbon source (CVD uses a thin diamond seed plate with methane).
- (A) चूक
Wrong: aluminium oxide; contains no carbon.
- (B) चूक
Wrong: silicon carbide; a diamond simulant.
- (C) बरोबर
Correct: graphite, a form of carbon, is converted to diamond under high pressure and temperature.
- (D) चूक
Wrong: zirconium dioxide; a diamond simulant.