Practice Test: Question Set - 17
1. Which of the following is not an ore of copper?
- (A) Cryolite
- (B) Azurite
- (C) Chalcopyrite
- (D) Malachite
2. The surface tension of a liquid, at critical temperature is
- (A) Indeterminate
- (B) Zero
- (C) Infinity
- (D) Same as that at any other temperature
3. Dislocations are __________ defects.
- (A) Point
- (B) Line
- (C) Volume
- (D) None of these
4. 'Amortization' in respect of financial obligation of a company means the
- (A) Liquidation of financial obligations on instalment basis
- (B) Commitment of financial obligation on priority
- (C) Liquidation of all the obsolete equipments of the company
- (D) Modernisation of the plant equipments
5. M10 index of coke indicates its
- (A) Compressive strength
- (B) Hardness
- (C) Abrasion resistance
- (D) Impact strength
6. The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the __________ of the slag.
- (A) Fluidity
- (B) Basicity
- (C) Acidity
- (D) Viscosity
7. Addition of __________ to steel does not impart hardness.
- (A) Nickel
- (B) Copper
- (C) Chromium
- (D) Silicon
8. The same volume of all gases is representative of their
- (A) Specific gravities
- (B) Densities
- (C) Gas characteristic constants
- (D) Molecular weights
9. Which of the following is an acidic constituent of B.F. slag?
- (A) SiO2
- (B) FeO
- (C) MgO
- (D) CaO
10. For infinite parallel planes having emissivities ε1 & ε2, the interchange factor for radiation from surface 1 to surface 2 is given by
- (A) (ε1 + ε2)/ε1.ε2
- (B) ε1.ε2/(ε1 + ε2 -
ε1.ε2)
- (C) ε1.ε2
- (D) ε1 + ε2
11. Larger length & diameter water pipes are made by
- (A) Electrical resistance welding
- (B) Die casting
- (C) Semi-centrifugal casting
- (D) Continuous casting
12. Wave length of X-rays is about 1 angstrom; however it cannot pass through a sheet of
- (A) Paper
- (B) Cloth
- (C) Lead
- (D) Aluminium
13. Eutectoid composition of carbon steel at room temperature is
- (A) Cementite
- (B) Pearlite
- (C) Martensite
- (D) Ferrite
14. Which of the following is an unconventional source of energy?
- (A) Thermal power
- (B) Hydroelectric power
- (C) Nuclear-fusion power
- (D) Solar power
15. The refrigerant freon-12 is chemically
- (A) CCl2F2
- (B) CCl3F
- (C) CClF3
- (D) CCl4F
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