Explore topic-wise MCQs in Mechanical Behaviour.

This section includes 19 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.

Compressive stresses don’t make a serious problem when applied on brittle materials.

A. True
B. False
Answer» B. False
Discussion
2.

Orowan and Irwin theory is given for cracking in brittle materials.

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

What does plastic deformation do on crack propagation?

A. Lowers surface energy
B. Sharpens the tip
C. Reduces required work
D. Increases concentration of stress
Answer» B. Sharpens the tip
Discussion
4.

Elastic strain energy ___ with increase in crack length.

A. Increases
B. Decreases
C. Remains constant
D. May increase or decrease
Answer» C. Remains constant
Discussion
5.

As length of crack increases, surface energy of crack ___

A. Increases
B. Decreases
C. Remains constant
D. May increase or decrease
Answer» B. Decreases
Discussion
6.

Surface energy of crack is given by __________a) 4ϒsab) 2ϒs(

A. 4ϒsa
B. 2ϒs(a) 1/2
C. 2ϒsE
D. 2ϒsa
Answer» B. 2ϒs(a) 1/2
Discussion
7.

Elastic strain energy is proportional to ____________a) (

A. (a)1/2
B. a
C. a2
D. a3
Answer» D. a3
Discussion
8.

ELASTIC_STRAIN_ENERGY_____WITH_INCREASE_IN_CRACK_LENGTH.?$

A. Increases
B. Decreases
C. Remains constant
D. May increase or decrease
Answer» C. Remains constant
Discussion
9.

Orowan and Irwin theory is given for cracking in brittle materials.$

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

What_does_plastic_deformation_do_on_crack_propagation?$

A. Lowers surface energy
B. Sharpens the tip
C. Reduces required work
D. Increases concentration of stress
Answer» B. Sharpens the tip
Discussion
11.

Compressive_stresses_don’t_make_a_serious_problem_when_applied_on_brittle_materials.$

A. True
B. False
Answer» B. False
Discussion
12.

As length of crack increases, surface energy of crack __?

A. Increases
B. Decreases
C. Remains constant
D. May increase or decrease
Answer» B. Decreases
Discussion
13.

Surface energy of crack is given by __________

A. 4ϒ<sub>s</sub>a
B. 2ϒ<sub>s</sub>(a)<sup> 1/2</sup>
C. 2ϒ<sub>s</sub>E
D. 2ϒ<sub>s</sub>a
Answer» B. 2‚âà√¨‚àö‚â†<sub>s</sub>(a)<sup> 1/2</sup>
Discussion
14.

Surface energy associated with crack is proportional to ______

A. a
B. a<sup>2</sup>
C. a<sup>1/2</sup>
D. a<sup>-1</sup>
Answer» B. a<sup>2</sup>
Discussion
15.

On tensile loading, the elastic energy stored per unit volume will ___ with an increase in load.

A. Increases
B. Decreases
C. Remains constant
D. Increases or decreases
Answer» B. Decreases
Discussion
16.

Elastic strain energy is proportional to ____________

A. (a)<sup>1/2</sup>
B. a
C. a<sup>2</sup>
D. a<sup>3</sup>
Answer» D. a<sup>3</sup>
Discussion
17.

What is the expression for maximum stress at the tip of crack?

A. σ<sub>max</sub> = 2 σ (ar)<sup>1/2</sup>
B. σ<sub>max</sub> = 2 σ (a/r) <sup>1/2</sup>
C. σ<sub>max</sub> = 2 σar
D. σ<sub>max</sub> = 2 (σar)<sup>1/2</sup>
Answer» C. ‚âà√¨‚àö√¢<sub>max</sub> = 2 ‚âà√¨‚àö√¢ar
Discussion
18.

Which theory explains brittle fracture?

A. Griffith
B. Cottrell
C. Taylor
D. Dislocation
Answer» B. Cottrell
Discussion
19.

In which type of brittle fracture, crack travels through grain boundaries?

A. Trans granular
B. Intra granular
C. Intergranular
D. Fibrous
Answer» D. Fibrous
Discussion