Ductility of a material can be defined as__________________?

A. Ability to undergo large permanent deformations in compression
B. Ability to recover its original form
C. Ability to undergo large permanent deformations in tension
D. All of the above

The ultimate tensile strength of low carbon steel by working at a high strain rate will_________________?

A. Decrease
B. Increase
C. Remain constant
D. First increase and then decrease

In compression, a prism of brittle material will break________________?

A. By forming a bulge (l>) by shearing along oblique plane
B. In direction perpendicular to application of load
C. By crushing into thousands of pieces
D. None of the above

Slow plastic defomiation of metals under a constant stress is known as________________?

A. Creep
B. Fatigue
C. Endurance
D. Plastic deformation

The number of electrons in 1 cm3 of metal would be of the order of_______________?

A. 1010
B. To16
C. 1022
D. 1040

The elastic stress strain behaviour of rubber is_____________________?

A. Linear
B. Non-linear
C. Plastic
D. No fixed relationship

Recrystallization temperature is one________________?

A. At which crystals first start forming from molten metal when it is cooled
B. At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated
C. At which change of allotropic form takes place
D. At which crystals grow bigger in size

Delta iron occurs at temperature of_______________?

A. Room temperature
B. Above melting point
C. Between 1400°c and 1539°c
D. Between 910°c and 1400°c

Super conduction by metals is observed in the temperature range of_________________?

A. Below 10°k
B. Above 100°k
C. Around 0°c
D. Around 100°c

Which of the following represents the allotropic forms of iron__________________?

A. Alpha iron, beta iron and gamma iron
B. Alpha iron and beta iron
C. Body centred cubic a-iron and face centred cubic a-iron
D. Alpha iron, gamma from and delta iron