351. For separating small pieces of metal from engine oil of a car, the best separating technique is the _____________________ ?
A. Chromatography
B. Evaporation
C. Filtration
D. Fractional distillation

352. In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet ?
A. Zirconia
B. Alumina
C. Bakelite
D. Tungsten carbide

353. In TIG welding, thoriated tungsten electrodes are used, because it ____________________
A. Has higher current carrying capacity
B. Has better electron emissivity
C. Is stronger than ordinary tungsten
D. Is easy to prepare

354. The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased ___________________ times ?
A. Two
B. Four
C. Six
D. Eight

355. A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material ?
A. Steel
B. Glass
C. Rubber
D. Brass

356. The dimensional formula of bulk modulus of elasticity is same as that of the ____________________?
A. Pressure
B. Density
C. Force
D. None of these

357. Working of linear variable differential transducer (LVDT) is based on the principle of variable_____________________?
A. Capacitance
B. Resistance
C. Mutual inductance
D. None of these

358. A cylindrical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson’s ratio of the rod is___________________?
A. 0
B. 0.33
C. 0.44
D. 0.25

359. Which of the following metals is the most prone to work hardening ?
A. Brass
B. Aluminium
C. Copper
D. Lead

360. Wavelength of radiation emitted by a body depends on the ________________ of its surface?
A. Temperature
B. Area
C. Nature
D. All ‘A’, ‘B’ & ‘C’

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