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41.
Graphite is a good conductor of electricity due
to the presence of _______.
- A.lone pair of electrons
- B.free valence electrons
- C.cations
- D.anions
- Answer
- Report
Answer : [B]
42.
The melting point of _______ solids is very
low.
- A.polar molecular
- B.non-polar molecular
- C.hydrogen bonded molecular
- D.ionic
- Answer
- Report
Answer : [B]
43.
__________ is the smallest repeating unit in space lattice.
- A.A unit cell
- B.A lattice point
- C.An atom
- D.An ion
- Answer
- Report
Answer : [A]
44.
The geometry of the lattice can be obtained by
joining the _______ with _______ lines.
- A.lattice points, straight
- B.lattice points, curved
- C.unit cells, straight
- D.unit cells, curved
- Answer
- Report
Answer : [A]
45.
Calculate the angle of incidence θ for a first order diffraction of X-rays of wavelength 1.54
Å. The distance ‘d’ between two successive planes is 2.01 Å.
- A.11.5o
- B.22.5o
- C.27.5o
- D.33.5o
- Answer
- Report
Answer : [B]
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