Who performed the oil drop experiment to determine the charge of an electron? MCQ with Answer and Explanation

Question
Who performed the oil drop experiment to determine the charge of an electron?
A. James Chadwick
B. Ernest Rutherford
C. Robert Millikan
D. Henry Moseley
Answer: Option C
Solution (By JKExamLibrary)
Robert Millikan, along with Harvey Fletcher, performed the famous oil drop experiment in 1909. By observing the motion of tiny charged oil droplets in an electric field, Millikan accurately determined the elementary charge of a single electron to be approximately 1.592 × 10^-19 coulombs (later refined to 1.602 × 10^-19 C).
This question belongs to: Science chemistry

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Practice More chemistry Questions

Question #1
Rusting of iron is accelerated in:
A. Saline water
B. Vacuum
C. Pure water without air
D. Dry air
Discuss

Correct Answer: Option A

Explanation:
Saline water (containing NaCl) increases the electrical conductivity of the water, accelerating the electrochemical process of rusting. This is why ships and coastal structures rust faster. Dry air and vacuum have no moisture; pure water without dissolved oxygen slows rusting.
This question belongs to: Science chemistry
Question #2
The alloy brass is composed of:
A. Copper and tin
B. Iron and chromium
C. Aluminium and magnesium
D. Copper and zinc
Discuss

Correct Answer: Option D

Explanation:
Brass: Cu + Zn. Bronze: Cu + Sn. Stainless steel: Fe + Cr + Ni. Duralumin: Al + Cu + Mg. Brass is used for musical instruments and utensils.
This question belongs to: Science chemistry
Question #3
The relationship between volume and temperature for a fixed mass of gas at constant pressure was given by:
A. Boyle
B. Charles
C. Avogadro
D. Gay-Lussac
Discuss

Correct Answer: Option B

Explanation:
Jacques Charles formulated the law: V ∝ T at constant P. Hence Charles' law. Gay-Lussac's law relates pressure and temperature at constant volume. Boyle's law: pressure-volume at constant temperature. Avogadro's law: volume-moles at same T & P. Charles also was a pioneer in ballooning.
This question belongs to: Science chemistry
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