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1
NDA General Ability 1st September 2024
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one among the following is an example of chemical change?
1
Sublimation of camphor
2
Melting of ice
3
Heating of an iron rod
4
Mixing of NaOH and HCI
2
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%

3
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

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

Litmus, a well-known acid-base indicator, is derived from :

A

Fungi

B

Lichens

C

Bacteria

D

Termite

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