441. Super conduction in metals is observed at a temperature of ________________ °K?
A. About 273
B. >100
C. <100
D. About 373

442. Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an ______________ body?
A. Grey
B. Opaque
C. Black
D. White

443. Which of the following is the largest quantum of pressure ?
A. 1 bar
B. 1 kg/cm2
C. 1 atmosphere
D. 1 kilo Pascal

444. Absolute zero, pressure will occur, when the molecular momentum of the system becomes zero. A liquid will cease to exist as liquid at________________?
A. 0°K
B. Zero pressure
C. High vacuum
D. Earth’s centre

445. In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is ?
A. Less
B. Equal
C. More
D. Unpredictable

446. The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the________________?
A. Creep strength
B. Fatigue strength
C. Resilience
D. Endurance limit

447. Hot working of lead is carried out at ___________________?
A. 150°C
B. 373°K
C. 75°C
D. Room temperature

448. The Al2O3 content of cryolite in Hall-Heroult cell is maintained between _______________ percent ?
A. 2-5
B. 12-15
C. 18-20
D. 6-12

449. Fatigue resistance of a material is measured by the _____________________?
A. Ultimate tensile strength
B. Elastic limit
C. Young’s modulus
D. Endurance limit

450. Ultimate strength in tension as compared to that in shear for steel is____________________?
A. One third
B. Half
C. One and half times
D. One fourth

NOTE
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