1. _________ structure has maximum hardness ?

Troostile

Pearlite

Martensite

Sorbite

Answer: Martensite

Explanation:


2. _______ has least coefficient of expansion ?

Manganin

Invar

Constantan

Duralumin

Answer: Invar

Explanation:


3. _______ is the essential gradient of any hardened steel ?

Carbon

Pearlite

Austenite

Martensite

Answer: Carbon

Explanation:


4. ______ structure can be studied by naked eye ?

Atomic

Grain

Micro

Macro

Answer: Grain

Explanation:


5. ______ is used for bearing liner ?

Brass

Bronze

Gun metal

Babbitt metal

Answer: Babbitt metal

Explanation:


6. ______ is the most important element which controls the physical properties of steel ?

Carbon

Chromium

Vanadium

Tungsten

Answer: Carbon

Explanation:


7. Practical fluids ?

are viscous

possess surface tension

are compressible

possess all the above properties

Answer: possess all the above properties

Explanation:


8. Property of a fluid by which its own molecules are attracted is called ?

adhesion

cohesion

viscosity

compressibility

Answer: cohesion

Explanation:


9. For very great pressures, viscosity of most gases and liquids ?

remains same

increases

decreases

shows erratic behaviour

Answer: increases

Explanation:


10. The bulk modulus of elasticity ?

has the dimensions of 1/pressure

increases with pressure

is large when fluid is more compressible

is independent of pressure and viscosity

Answer: increases with pressure

Explanation: