Elements NDA Questions

NDA Chemistry

Elements MCQ Questions


13.
What term describes the arrangement of particles in a solid?
A.
Random
B.
Disordered
C.
Tightly packed
D.
Freely moving
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ANSWER :
C. Tightly packed
14.
What method is commonly used to separate gravel from sand at a construction site?
A.
Filtration
B.
Sedimentation
C.
Centrifugation
D.
Sieving
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ANSWER :
D. Sieving
15.
What are atoms primarily composed of?
A.
Electrons, protons, and neutrons
B.
Electrons and protons
C.
Neutrons and protons
D.
Electrons and neutrons
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ANSWER :
A. Electrons, protons, and neutrons
16.
What part of the atom carries a negative charge?
A.
Protons
B.
Neutrons
C.
Electrons
D.
Nucleus
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ANSWER :
C. Electrons
17.
On Earth, which three atoms are among the most abundant?
A.
Carbon, nitrogen, hydrogen
B.
Iron, oxygen, silicon
C.
Sodium, potassium, magnesium
D.
Helium, neon, argon
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ANSWER :
B. Iron, oxygen, silicon
18.
What is the percentage of hydrogen atoms on Earth compared to their abundance in the universe?
A.
74%
B.
50%
C.
25%
D.
10%
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ANSWER :
B. 50%