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1
TG EAPCET 2024 (Online) 9th May Evening Shift
MCQ (Single Correct Answer)
+1
-0
Identify the correct statement about the crystal defects in solids.
A
Frenkel defect is favoured when the difference between sizes of cation and anion is very small.
B
Frenkel defect is not a dislocation effect.
C
Schotthy defects have no effect on physical properties of solids.
D
Trapping of electrons in lattice leads to the formation of F-centres.
2
TG EAPCET 2024 (Online) 9th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
The molecular formula of a compound is $A B_2 \mathrm{O}_4$. Atoms of $O$ form ccp lattice. Atoms of $A$ (cation) occupy $\frac{1}{8}$ th of tetrahedral voids. Atoms of $B$ (cation) occupy a fraction of octahedral voids. What is the fraction of vacant octahedral voids?
A
$\frac{3}{4}$
B
$\frac{1}{4}$
C
$\frac{1}{3}$
D
$\frac{1}{2}$
3
TS EAMCET 2023 (Online) 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Identify the crystal system in which primitive unit cell has edge lengths $a=b=200 \mathrm{pm}$ and $c=300 \mathrm{pm}$ and all axial angles are same

A
tetragonal
B
rhombohedral
C
monoclinic
D
cubic
4
TS EAMCET 2023 (Online) 12th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Assertion (A) Graphite is used as a dry lubricant in machines which run at high temperatures.

Reason ( $\mathbf{R}$ ) The layers of graphite slip one over the other when pressure is applied.

The correct option among the following is

A
(A) is true but (R) is false
B
(A) is false but $(R)$ is true
C
$(A)$ and $(R)$ are true and $(R)$ is the correct explanation of $(A)$
D
(A) and (R) are true, but $(R)$ is not the correct explanation of $(A)$
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