Sessional-1 MPT 1&2 send sem

Which of the following is the most basic structural unit of matter?

• Atom

• Crystal

• Element

• Molecule

Which of the following is not matched correctly with respect to the manufacturing process and their condition of matter subtraction/addition?

• Casting:- Constant material volume retained

• Machining:- Material removal process

• Welding:- Material addition process

• Forming:- Material addition process

Which of the following statement is true corresponding to the bonding of solids?

• Attractive force results between two nuclei.

• Repulsive force results between atoms.

• Attractive force increases with the decrease in distance between the two entities.

• All of the above statements are true.

Which of the following is not true corresponding to Van der Waals forces?

• These are intermolecular forces.

• The forces are proportional to d4.

• These are weaker than the other bonding forces.

• These forces are attributed to the rapidly fluctuating dipole moments.

How many number of atoms are present per unit cell in case of BCC crystal structure?

• 2

• 3

• 4

• 1

If the radius of an atom in a close-packed hexagonal crystal is r, the length of the edge of the unit cell, a is:

• r/2

• 2r/3

• 2r

• r/4

Which of the following properties in a solid depends on its crystal structure?

• Yield stress

• Work hardening

• Ductility

• Creep

Which of the following property is measured by calculating the area under the stress-strain curve?

• Hardness

• Endurance

• Strength

• Toughness

The property of a material by which it can be beaten or rolled into thin sheets is called:

• Elasticity

• Ductility

• Malleability

• Plasticity

Which among the following is the best characteristic that a perfectly elastic body holds?

• It has a perfectly smooth surface.

• It completely recovers its original size and shape when the deforming force is removed.

• t can move freely.

• It cannot be deformed by any external surface.