J.J. Thomson is credited with the discovery of the: MCQ with Answer and Explanation

J.J. Thomson is credited with the discovery of the:
A. Neutron
B. Proton
C. Electron
D. Nucleus
Answer: Option C
Solution (By JKExamLibrary)
J.J. Thomson discovered the electron in 1897 through his experiments with cathode ray tubes. He demonstrated that cathode rays were composed of previously unknown negatively charged particles, which were later named electrons. This discovery proved that atoms were not indivisible and led to his 'plum pudding' model.

This question belongs to: Science chemistry

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More chemistry Questions

Question #1
Sodium hydroxide (NaOH) is prepared industrially by the electrolysis of brine. The by-product chlorine is used in:
A. PVC and disinfectants
B. Steel making
C. Glass manufacturing
D. Fertilizer production

Correct Answer: Option A


Explanation:
Chlorine produced in the chlor-alkali process is used to manufacture PVC (polyvinyl chloride), bleaching powder, disinfectants, and solvents. Glass uses Na₂CO₃. Fertilizers use NH₃ and acids. Steel making uses oxygen. Chlorine is a versatile industrial chemical with many downstream products.

This question belongs to: Science chemistry
Question #2
Urea is a fertilizer that provides:
A. Nitrogen and phosphorus
B. Only nitrogen
C. Only phosphorus
D. Only potassium

Correct Answer: Option B


Explanation:
Urea, CO(NH₂)₂, is a straight nitrogenous fertilizer with about 46% N. It contains no phosphorus or potassium. It is converted to ammonium carbonate in soil by urease enzyme, then to nitrates.

This question belongs to: Science chemistry
Question #3
Which of the following is used as an antacid?
A. Calcium sulfate
B. Sodium chloride
C. Ammonium chloride
D. Sodium bicarbonate

Correct Answer: Option D


Explanation:
Sodium bicarbonate (NaHCO₃), baking soda, is a mild base that neutralizes excess stomach acid (HCl) providing relief from acidity. Reaction: NaHCO₃ + HCl → NaCl + H₂O + CO₂. It is a component of many antacid formulations. Sodium chloride is table salt, ammonium chloride is not safe, and calcium sulfate is plaster of Paris ingredient. Milk of magnesia (Mg(OH)₂) is also an antacid.

This question belongs to: Science chemistry

Fatal error: Uncaught PDOException: SQLSTATE[42S02]: Base table or view not found: 1146 Table 'u220813639_questions.youtube_shorts' doesn't exist in /home/u220813639/domains/ask.jkexamlibrary.in/public_html/templates/partials/sidebar.php:55 Stack trace: #0 /home/u220813639/domains/ask.jkexamlibrary.in/public_html/templates/partials/sidebar.php(55): PDO->query() #1 /home/u220813639/domains/ask.jkexamlibrary.in/public_html/templates/question.php(278): require('/home/u22081363...') #2 /home/u220813639/domains/ask.jkexamlibrary.in/public_html/index.php(53): require_once('/home/u22081363...') #3 {main} thrown in /home/u220813639/domains/ask.jkexamlibrary.in/public_html/templates/partials/sidebar.php on line 55