As standard notch which is made on material during impact fracture testing has an angle of 45°. The type of notch used in case of Charpy and Izod test is V-notch.

The above statement is true. Controlled unidirectional solidification of alloys is a technique used to increase creep resistance of an alloy.

The tendency of brittle fracture to be observed increases as strain rate of body increases. As strain rate increases body dislocations start piling up and ultimately leading to failure.

900 J/m² can be value of G for polymers close to glass transition temperature as range of G for this case is known to be 2 J/m² to 1000 J/m². As or options lie out of this range, re is only one correct answer.

The tendency of brittle fracture to be observed increases as temperature decreases.

Alloys resistant to creep have high melting temperature and refore are high temperature alloys.

The above statement is true. When hot water is poured in a cold glass, glass may get cracked due to rmal shock due to sudden change in temperature of glass.

Fatigue is one of mechanical failures of metals that occur due to cyclic loading. It occurs when stress applied is less than yield stress or yield point.

Tendency of a material to behave as a brittle material in presence of a notch is termed as notch sensitivity. Carbons, steels and plastics which are notch sensitive while FCC metals aren’t notch senitive.

Cast iron or cast steel in Wohler’s Fatigue test can approximately be subjected to 10,000,000 cycles before it fails.