Deformation by twinning is not a dominant mode of deformation in FCC metals.

Inhomogeneous deformation of crystal results in regions of different orientation called deformation bands. Deformation bands have been observed in both fcc and bcc metals, but not in hcp metals.

A

True

B

False

A metal crystallizes into two cubic phases BCC and FCC. The ratio of densities of FCC and BCC is equal to 1.5. Calculate the difference between the unit cell lengths of the FCC and BCC crystals if the edge length of the FCC crystal is equal to 4.0 Å.

A

0.5 Å

B

0.37 Å

C

0. 28 Å

D

0.73 Å

Twinning is not associated with specific crystallographic direction; it only depends on the direction of mechanical force. There is no preferred orientation of twinning in crystal.

A

True

B

False

The plane passing through the twinning axis and separating the region of twinning from undeformed part is called ___ planes.

A

Twinning

B

Slip

C

Basal

D

Close packed

You know that H is dominant for height locus and H is recessive. Is the F2 progeny are a mixture of 3:1 dominant: recessive and you pick a dominant plant at random what will be the probability that the F3 will have a mixture of dominant and recessive traits as well?

A

All will show

B

1/16

C

1/4

D

2/3

Statement (I): Pursuant to plastic deformation of metals, the mechanical properties of the metals get changed. Statement (II): Mechanical properties of metals depend on grain size also which gets changed by plastic deformation.

A

Both Statement I) and Statement II) are individually true and Statement II) is the correct explanation of Statement I)

B

Both Statement I) and Statement II) are individually true but Statement II) is not the correct explanation of Statement I)

C

Statement I) is true but Statement II) is false

D

Statement I) is false but Statement II) is true

Whenever some external system of forces acts on a body, it undergoes some deformation. As the body undergoes some deformation, it sets up some resistance to the deformation. This resistance per unit area to deformation, is called

A

Strain

B

Stress

C

Pressure

D

Modulus of elasticity

India has been constantly negotiating for an expansion in the trade in services via Mode 4 as defined under the General Agreement on Trade in Services (GATS). Consider the following pairings regarding different modes of Services under GATS of the WTO: 1. Mode 1 : Cross-Border Supply of Services 2. Mode 2 : Temporary cross-border movement of a natural person to consume services abroad 3. Mode 3 : Cross-border provision of services via the commercial presence of a company in another country 4. Mode 4 : Temporary cross-border movement of service providers Which of the above are correctly paired?

A

Only 1 and 4

B

Only 2 and 3

C

Only 1, 3 and 4

D

All of the above

Post office protocol (POP) is a message access protocol which is used to extract message for client. In this regard, which of the following are true ? (A) POP has two modes, Delete mode and keep (B) In Delete mode, mail is deleted from mail box after each retrival (C) In Delete mode, mail is deleted from mail box before each retrieval (D) In keep mode, mail is deleted before retrival (E) In keep mode, mail remains in mail box after retrival Choose the correct answer from the options given below:

A

(A) and (B) only

B

(A), (D) and (E) only

C

(A), (B), (C) and (D) only

D

(A), (B) and (E) only

The following question has two premises and two conclusions. If the premises re assumed to be true (irrespective of factuality), then, in respect of each of the items given below, which of the following conclusions follow logically? Premises: All metals are grey in colour. Some metals are heavy. Conclusion: I. All heavy metals are grey in colour. II. All light metals are not grey in colour.

A

Only I

B

Only II

C

Both I and II

D

Neither I nor II

Deformation by twinning is not a dominant mode of deformation in FCC metals.

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