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1
MHT CET 2021 20th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

What type of crystal structure from following has 52.36% packing efficiency?

A
FCC
B
BCC
C
Hexagonal cubic
D
Simple cubic
2
MHT CET 2021 20th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

An element (molar mass 180 ) has BCC crystal structure with density $$18 \mathrm{~g} \mathrm{~cm}^{-3}$$. What is the edge length of unit cell?

A
$$\sqrt[3]{23.2} \times 10^{-24} \mathrm{~cm}$$
B
$$\sqrt[3]{12.6} \times 10^{-24} \mathrm{~cm}$$
C
$$\sqrt[3]{33.2} \times 10^{-8} \mathrm{~cm}$$
D
$$\sqrt[3]{22.6} \times 10^{-8} \mathrm{~cm}$$
3
MHT CET 2020 19th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

An element crystallises in fcc type of unit cell. The volume of one unit cell is $24.99 \times 10^{-24} \mathrm{~cm}^3$ and density of the element $7.2 \mathrm{~g} \mathrm{~cm}^{-3}$. Calculate the number of unit cells in 36 g of pure sample of element?

A
$2.0 \times 10^{23}$
B
$1.25 \times 10^{21}$
C
$2.0 \times 10^{21}$
D
$2.0 \times 10^{24}$
4
MHT CET 2020 19th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

What is the percentage of unoccupied space in fcc unit cell?

A
$74 \%$
B
$68 \%$
C
$32 \%$
D
$26 \%$
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