Atoms-and-Molecules UPSC Questions

Chemistry

Atoms-and-Molecules MCQ Questions


13.
Electrical discharge carried out in the modified cathode ray tube led to the discovery of _____ carrying positively charged particles.
A.
Anode rays
B.
Protons
C.
Canal rays
D.
Cathode rays
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ANSWER :
C. Canal rays
14.
The smallest and lightest positive ion was obtained from hydrogen and was called _____
A.
Ray
B.
Anion
C.
Canal rays
D.
Proton
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ANSWER :
D. Proton
15.
Electrically neutral particles having a mass slightly greater than that of protons are called _____
A.
Protons
B.
Neutrons
C.
Isotopes
D.
Electrons
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ANSWER :
B. Neutrons
16.
Who discovered neutrons?
A.
Chadwick
B.
John Dalton
C.
J.J.Thomson
D.
Albert Einstein
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ANSWER :
A. Chadwick
17.
Neutrons were discovered by Chadwick by bombarding a thin sheet of beryllium by _____
A.
g particles
B.
h particles
C.
α-particles
D.
b particles
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ANSWER :
C. α-particles
18.
What is the relative charge of a proton?
A.
-1
B.
1
C.
0
D.
None of these
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ANSWER :
B. 1