Q.1.
The free space in a BCC unit cell is
-
30%
48%
-
43%
32%
-
17%
26%
-
9%
23%
Q.2.
The number of carbon atoms per unit cell of diamond unit cell is
-
0%
1
-
35%
4
-
35%
6
-
30%
8
Q.3.
The number of Octahedral void per atom present in cubic close packed structure is
-
33%
1
-
17%
2
-
28%
4
-
22%
3
Q.4.
A metal M crystallizes in FCC and BCC structures depending upon the temperature. The ratio of its densities in FCC and BCC structures would be
-
15%
$\frac {1}{2}$
-
46%
$\frac {8}{3 \sqrt 6}$
-
8%
$\frac {8}{ \sqrt 6}$
-
31%
$\frac {16}{3 \sqrt 6}$
Q.5.
The ionic radius of the A+ is $.98 \times 10^{-10} \ m$ and that of B- is $ 1.81\times 10^{-10} \ m$. The coordination number of each ion in AB is
-
31%
2
-
38%
6
-
23%
4
-
8%
8
Q.6.
A substance $A_xB_y$ crystallizes in a face centred cubic (FCC) lattice in which atoms A occupy each corner of the cube and atoms B occupy the centre of each face of the cube.The correct composition of the substance $A_xB_y$ is
-
0%
$A_3B$
-
46%
$A_4B_3$
-
46%
$AB_3$
-
8%
Composition cannot be specified
Q.7.
Match the column
-
58%
p ->iii, q ->i, r -> iv , s -> ii
-
33%
p ->ii, q ->iii, r -> iv , s -> i
-
0%
p ->i, q ->ii, r -> I , s -> iv
-
8%
p ->iii, q ->ii, r -> I , s -> iv
Q.8.
Match the column
-
58%
p -> ii, q -> i, r -> iv, s-> iii
-
25%
p -> ii, q -> i, r -> iii, s-> iv
-
0%
p -> i, q -> iii, r -> ii, s-> iv
-
17%
p -> iii, q -> ii, r -> iv, s-> i
Q.9.
Match the column
-
27%
(p) -> (i), (q) ->(iii), r ->(iv) , (s) -> (ii)
-
27%
(p) -> (iv), (q) ->(ii), r ->(i) , (s) -> (iii)
-
18%
(p) -> (iv), (q) ->(iii), r ->(ii) , (s) -> (i)
-
27%
(p) -> (iv), (q) ->(iii), r ->(i) , (s) -> (ii)
Q.10.
The total volume of atoms present in BCC unit cell of metal(atomic radius =r) is given by?
-
18%
$\frac {24}{3} \pi r^3$
-
55%
$\frac {16}{3} \pi r^3$
-
9%
$\frac {32}{3} \pi r^3$
-
18%
$\frac {8}{3} \pi r^3$
Q.11.
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b)Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
Assertion: Semiconductors are solids with conductivities in the intermediate range from $10^{–6}$ – $10^{4}$ ohm–1m–1
Reason: Intermediate conductivity in semiconductor is due to partially filled valence band
-
38%
(a)
-
50%
(b)
-
12%
(c)
-
0%
(d)
Q.12.
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b)Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
Assertion : The total number of atoms present in a simple cubic unit cell is one.
Reason: In a Simple cubic arrangement ,there are atoms at the corners of each cube
-
71%
(a)
-
14%
(b)
-
14%
(c)
-
0%
(d)
Q.13.
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b)Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
Assertion : band gap in Germanium is small
Reason: The energy spade of each germanium atomic energy level is infinitesimally small
-
38%
(a)
-
25%
(b)
-
12%
(c)
-
25%
(d)
Q.14.
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b)Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
Assertion: Total number of tetrahedral voids present in unit cell of cubic close packing is 8
Reason : FCC has 2 atoms per unit cell
-
33%
(a)
-
33%
(b)
-
33%
(c)
-
0%
(d)
Q.15.
When Zinc converts from liquid state to solid state, it has hcp structure, then find the number of nearest atoms
-
50%
6
-
38%
4
-
12%
8
-
0%
12
Q.16.
The appearance of colour in solid alkali atom halides is generally due to
-
0%
interstitial positions
-
62%
F centers
-
38%
Schottky defect
-
0%
Frenkel defect
Q.17.
Which of the following molecules has three-fold axis of symmetry
-
44%
$NH_3$
-
22%
$C_2H_4$
-
11%
$CO_2$
-
22%
$SO_2$
Q.18.
The edge length of a face centered cubic cell of an ionic substance is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is
-
33%
288 pm
-
17%
398 pm
-
17%
618 pm
-
33%
144 pm
Q.19.
A compound AB crystallizes in the BCC lattice with Unit cell edge length of 380 pm.
Calculate the distance between the oppositely charged ions in lattice
-
0%
351 pm
-
25%
288 pm
-
38%
300 pm
-
38%
329.1 pm
Q.20.
What is the radius of B- if the radius of A+ is 154.1 pm
-
22%
175 pm
-
22%
162 pm
-
22%
112 pm
-
33%
none of these