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Which of the following statements are true about edge dislocations?
P. Edge dislocations do not have an extra half plane associated with them.
Q. The Burger vectors is perpendicular to the direction.
R. Edge dislocations can avoid obstacles by cross-slip.
S. Depending on geometry, parallel edge dislocations of opposite signs can attract or repel one another.
An object X sinks in liquids P and Q but floats in liquid R. Which of the following conclusions can be made from these observations? A) Density of X is more than the density of P B) Density of X is less than the density of R C) Density of P is equal to the density of R D) Density of P is less than the density of R
Screw dislocations with jogs are __________ mobile than edge dislocations. Screw dislocations without jog move __________ from one plane to another than edge dislocation.
What is density of dislocations in annealed crystal?
The strain hardening behaviour of an annealed rod during cold rolling is given by σ = 700 $${\left( \in \right)^{0.2}}$$ MPa. where σ is the flow stress at strain $$ \in $$.
Flow stress after 50% reduction in area of the annealed rod on cold rolling is approximately
The recrystallization behaviour of a particular metal alloy is specified in terms of recrystallization temperature, which is typically 1/3rd of the absolute melting temperature of a metal or an alloy and depends on several factors including the amount of 1. cold working and purity of the metal and alloy 2. hot working and purity of the metal and alloy Which of the above is/are correct?
Metal 'A' displaces metal 'B' from its salt solution, but not able to displace metal 'C' from its salt solution. Metal 'B' displaces metal 'D' from its salt solution. Which of the following depicts correct order of reactivity of metals. 
Match the following  (a) a non-metal that exists in two forms (i) Chlorine (b) a non-metal which is liquid at room temperature   (ii) Zinc (c) a metal which is constituent of brass and bronze (iii) Carbon (d) a non-metal used for disinfecting water (iv) Bromine (e) a metal used in electroplating (v) Copper
Consider the figures of a metal ball and a metal ring given below.
The metal ball can just pass through the hole of a metal ring formed out of a strip. When the ball is heated it gets stuck. But when the metal is heated
Heat and Thermodynamics mcq question image
The dislocations in the material only act as strong obstacles to the movement of other dislocations.