Which of the following unit cell having maximum number of atoms ?

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

51.

Invar, an alloy of Fe and Ni is used in watches and meter scale. Its characteristic property is

  • small coefficient of expansion

  • resistance of corrosion

  • hardness and elasticity

  • magnetic nature


52.

An alloy of Pb and Sn in equal proportion is called:

  • solder

  • constantan

  • gun metal

  • type metal


53.

A compound with cubic structure is made of elements A and B. A atoms are at the corners of the cube and B atoms are at the face centres. The simplest formula of the compound is :

  • A5B

  • AB3

  • AB

  • AB6


Advertisement

54.

Which of the following unit cell having maximum number of atoms ?

  • BCC

  • HCP

  • FCC

  • Cubic


C.

FCC

Among the given options, FCC has maximum number of atoms. Atoms are present at 8 corners of cube and 1 at centre of each face. It can be calculated as-

No. of atoms in fcc = 8 × 18 + 12 × 6 = 1 + 3 = 4

In HCP, atoms in crystals are packed in ABAB pattern.

In BCC, atoms are present at 8 corners of cube and one atom is present at the centre of body of cube.


Advertisement
Advertisement
55.

Silicon is

  • semiconductor

  • insulator

  • conductor

  • None of these


56.

If the mass defect of a nuclide is 3.32 x 10-26g, its binding energy is ......... MeV

  • 9.31

  • 18.62

  • 27.93

  • 37.24


57.

AB is an ionic solid. The ionic radii of A+ and B- are respectively rc and ra. Lattice energy of AB is proportional to :

  • rcra

  • (rc + ra)

  • rarc

  • 1rc + ra


58.

If the mass defect of 5B11 is 0.081 u, its average binding energy (in MeV) is

  • 8.60

  • 6.85

  • 5.60

  • 5.86


Advertisement
59.

Which of the following statements is correct ?

  • Silicon doped with boron is an n-type semiconductor

  • Silicon doped with arsenic is a p-type semiconductor

  • Metals are good conductors of electricity

  • Electrical conductivity of semiconductors decreases with increasing temperature


60.

Assertion (A): White tin is an example of tetragonal system.
Reasoning (R): For a tetragonal system a= b = c and  α = β = γ ≠ 90°. The correct answer is

  • (A) and (R) are true and (R) is the correct explanation of (A).

  • Both (A) and (R) are true and (R) is not the correct explanation of (A).

  • (A) is true but (R) is not true.

  • (A) is not true but (R) is true.


Advertisement