1
NDA General Ability 21 April 2024
MCQ (Single Correct Answer)
+4
-1.33
Change Language

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?

NDA General Ability 21 April 2024 General Science - Physics Question 177 English
A

3ρ/4

B

9ρ/16

C

7ρ/8

D

5ρ/8

2
NDA General Ability 21 April 2024
MCQ (Single Correct Answer)
+4
-1.33
Change Language

The human eye is like a camera that has a lens with :

A

fixed focal length and fixed aperture size.

B

variable focal length and fixed aperture size.

C

fixed focal length and variable aperture size.

D

variable focal length and variable aperture size.

3
NDA General Ability 21 April 2024
MCQ (Single Correct Answer)
+4
-1.33
Change Language

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)?

A

19% and 81%

B

81% and 19%

C

38% and 62%

D

62% and 38%

4
NDA General Ability 21 April 2024
MCQ (Single Correct Answer)
+4
-1.33
Change Language

Which among the following are essential constituents of Portland cement?

A

Sand, lime, clay

B

Silica, alumina, lime

C

Silica, lime, graphite powder

D

Sand, graphene, clay

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