1
NDA General Ability 21 April 2024
MCQ (Single Correct Answer)
+4
-1.33
A spherical shell of outer radius R and inner radius R/2 contains a solid sphere of radius R/2 (see figure). The density of the material of the solid sphere is ρ and that of the shell is ρ/2. What is the average mass density of the larger sphere thus formed?

2
NDA General Ability 21 April 2024
MCQ (Single Correct Answer)
+4
-1.33
The human eye is like a camera that has a lens with :
3
NDA General Ability 21 April 2024
MCQ (Single Correct Answer)
+4
-1.33
The relative atomic mass of boron (which exists in two isotopic forms 10B and 11B) is 10.81. What will be the abundance of 10B and 11B, respectively (consider a sample of 100 atoms)?
4
NDA General Ability 21 April 2024
MCQ (Single Correct Answer)
+4
-1.33
Which among the following are essential constituents of Portland cement?
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General Science
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General Studies
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