Mechanical Behaviour and Testing of Materials Mock Test 3

10%

Question 1 of 10

1. The force of attraction or repulsion _____ with decreasing distance of separation.

increases

remains constant

decreases

first increases and then decreases

Question 1 of 10

Question 2 of 10

2. ____ is important in ductile metals for plastic deformation.

Twinning

Glide

Climb

Cross slip

Question 2 of 10

Question 3 of 10

3. The plane containing burgers vector and tangent vector allows glide of dislocation.

False

True

Question 3 of 10

Question 4 of 10

4. In a perfect crystal, shear stress is __________

Zero

Negative

Very low

Very high

Question 4 of 10

Question 5 of 10

5. Relation E ∝ b² is known as ______

Griffith law

Bauschinger effect

Burgers law

Frank’s rule

Question 5 of 10

Question 6 of 10

6. Dislocations during solidification produces due to ______

Impurity atoms

Metal atoms

Voids

Cooling

Question 6 of 10

Question 7 of 10

7. What is the range of theoretical shear strength of ductile metals?

1 to 10 GPa

10 to 100 GPa

2 to 20 GPa

20 to 200 GPa

Question 7 of 10

Question 8 of 10

8. Which statement is false?

Two edge dislocations of the same sign on parallel slip planes attract each other if ϴ<45°

Dislocations of same sign on the same slip plane repel each other

Two edge dislocations of the same sign on parallel slip planes repel each other if ϴ<45°

Dislocations of opposite sign on the same slip plane attract each other

Question 8 of 10

Question 9 of 10

9. Extended screw dislocations can move only on the plane with stacking fault.

True

False

Question 9 of 10

Question 10 of 10

10. Elastic strain energy of screw dislocation is ____ of that of edge dislocation for unit length?

Lesser

Higher

Half

Equal

Question 10 of 10