501. Killed steels
A. Are free from oxygen
B. Contain not even traces of sulphur & phosphorous
C. Are produced by L.D. process only
D. Contain minimum impurity level
✅ The correct answer is option A.
Engineering
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502. Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than
A. 5
B. 10
C. 20
D. 35
✅ The correct answer is option C.
503. With increase in pressure, the latent heat of steam
A. Increases
B. Decreases
C. Remains unchanged
D. Data insufficient; can’t be predicted
✅ The correct answer is option B.
504. Unit of surface tension in S.I. unit is
A. Watt/m
B. Joule/m²
C. Newton/m²
D. Joule/m
✅ The correct answer is option B.
505. The noble metals
A. Are exemplified by Na, K and Li
B. Do not resist corrosion very strongly
C. Are the lowermost in the electro-chemical series of metals
D. None of these
✅ The correct answer is option C.
506. Temperature attained in soldering of metals is about __________ °C.
A. 150-300
B. 400-500
C. 650-800
D. 1000-1100
✅ The correct answer is option A.
507. The units of the rate constant for a second order reaction are
A. Sec⁻¹. mole°
B. Moles¹. sec⁻¹
C. Moles⁻¹. sec¹
D. Moles¹. sec¹
✅ The correct answer is option C.
508. Monazite deposits constitute an important source for the following metal.
A. Thorium
B. Titanium
C. Molybdenum
D. None of the above
✅ The correct answer is option A.
509. __________ is a special constituent of chlorophyll without which photosynthesis is not possible.
A. Calcium
B. Nitrogen
C. Phosphorous
D. Hydrogen
✅ The correct answer is option B.
510. Which of the following is a commonly used manometric liquid for low pressure range?
A. Ethyl alcohol
B. Carbon tetrachloride
C. Glycerol
D. Ethylene glycol
✅ The correct answer is option B.