Explore topic-wise MCQs in Mechanical Behaviour.

This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Behaviour knowledge and support exam preparation. Choose a topic below to get started.

1.

Grain size strengthening can be understood by __________

A. Orowan mechanism
B. Hall-Petch equation
C. Schmid’s law
D. Bragg’s law
Answer» C. Schmid’s law
Discussion
2.

Grain refinement decreases ductility of the material.

A. True
B. False
Answer» C.
Discussion
3.

The number of dislocations is directly proportional to ___ and inversely proportional to ___

A. Shear modulus, Burgers vector
B. Shear modulus, Stress
C. Stress, Shear modulus
D. Burgers vector, Stress
Answer» D. Burgers vector, Stress
Discussion
4.

A material shows maximum strength when it consists of ____ dislocations.

A. No
B. Large number of
C. Very less number of
D. Intermediate number of
Answer» B. Large number of
Discussion
5.

Which property doesn’t improve on grain refinement?

A. Fatigue strength
B. Tensile strength
C. Hardness
D. Creep strength
Answer» E.
Discussion
6.

Which factor doesn’t promote fine grain structure?

A. Fast cooling rates
B. Inoculating agents
C. Mechanical vibrations
D. Longer holding times at high temperature
Answer» E.
Discussion
7.

THE_NUMBER_OF_DISLOCATIONS_IS_DIRECTLY_PROPORTIONAL_TO_____AND_INVERSELY_PROPORTIONAL_TO____?$

A. Shear modulus, Burgers vector
B. Shear modulus, Stress
C. Stress, Shear modulus
D. Burgers vector, Stress
Answer» D. Burgers vector, Stress
Discussion
8.

Grain size strengthening can be understood by __________$

A. Orowan mechanism
B. Hall-Petch equation
C. Schmid’s law
D. Bragg’s law
Answer» C. Schmid‚Äö√Ñ√∂‚àö√ë‚àö¬•s law
Discussion
9.

Grain_refinement_decreases_ductility_of_the_material.$

A. True
B. False
Answer» C.
Discussion
10.

A coarse grained material shows better strength at higher temperatures.

A. True
B. False
Answer» B. False
Discussion
11.

A material shows maximum strength when it consists of ____ dislocations?

A. No
B. Large number of
C. Very less number of
D. Intermediate number of
Answer» B. Large number of
Discussion
12.

Which property doesn’t improve on grain refinement?$

A. Fatigue strength
B. Tensile strength
C. Hardness
D. Creep strength
Answer» E.
Discussion
13.

What term is used for the temperature at which the strength of grain boundary and strength of grain is equal?

A. Equicohesive temperature
B. Curie temperature
C. Recrystallization temperature
D. Hardening temperature
Answer» B. Curie temperature
Discussion
14.

Which symbol represents frictional stress in the Hall-Petch equation?

A. σ<sub>0</sub>
B. σ<sub>i</sub>
C. K<sub>y</sub>
D. d
Answer» C. K<sub>y</sub>
Discussion
15.

Hall-Petch equation gives the relation between grain size and ___

A. Toughness
B. Ductility
C. Yield strength
D. Tensile strength
Answer» D. Tensile strength
Discussion
16.

What is the ASTM grain size number for 1024 grains per square inch at 100x magnification?

A. 10
B. 11
C. 12
D. 13
Answer» C. 12
Discussion
17.

For ASTM grain size number 10, give the number of grains per square inch at a magnification of 100x.

A. 512
B. 1024
C. 2048
D. 200
Answer» B. 1024
Discussion
18.

Which factor doesn’t promote fine grain structure?

A. Fast cooling rates
B. Inoculating agents
C. Mechanical vibrations
D. Longer holding times at high temperature
Answer» E.
Discussion