Who is credited with the discovery of the nucleus through the alpha-particle scattering experiment? MCQ with Answer and Explanation

Question
Who is credited with the discovery of the nucleus through the alpha-particle scattering experiment?
A. Niels Bohr
B. Ernest Rutherford
C. J.J. Thomson
D. James Chadwick
Answer: Option B
Solution (By JKExamLibrary)
Ernest Rutherford, along with his students Geiger and Marsden, conducted the famous gold foil experiment in 1911. By observing that a few alpha particles bounced back, he concluded that the atom has a small, dense, positively charged center called the nucleus.
This question belongs to: Science chemistry

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Practice More chemistry Questions

Question #1
Which of the following pairs are isobars?
A. ¹H and ²H
B. ¹²C and ¹⁴C
C. ³⁵Cl and ³⁷Cl
D. ⁴⁰Ar and ⁴⁰Ca
Discuss

Correct Answer: Option D

Explanation:
Isobars are atoms of different elements with the same mass number but different atomic numbers. ⁴⁰Ar (atomic number 18) and ⁴⁰Ca (atomic number 20) both have mass number 40. Options A and D are isotopes (same element, different mass number). Option C are isotopes of hydrogen. Isobars have different chemical properties because of different proton numbers. Example: ¹⁴C and ¹⁴N.
This question belongs to: Science chemistry
Question #2
Ethanol is produced by fermentation of sugar. The microorganisms used are:
A. Bacteria
B. Virus
C. Yeast
D. Algae
Discuss

Correct Answer: Option C

Explanation:
Yeast (Saccharomyces cerevisiae) enzymes convert glucose to ethanol and CO₂ anaerobically. Bacteria produce lactic acid or acetic acid; algae are photosynthetic.
This question belongs to: Science chemistry
Question #3
The process of converting a solid directly into vapor without passing through the liquid state is called:
A. Distillation
B. Condensation
C. Evaporation
D. Sublimation
Discuss

Correct Answer: Option D

Explanation:
Sublimation is the direct transition from solid to gas phase. Examples: naphthalene, camphor, iodine, solid CO₂ (dry ice). Evaporation is liquid to gas; condensation is gas to liquid; distillation separates liquid mixtures based on boiling points.
This question belongs to: Science chemistry
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