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. Electron
B. Nucleus
C. Neutron
D. Proton
Answer: Option A
Solution (By JKSSB Mock Tests)
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.

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Practice More chemistry Questions

Question #1
The main component of CNG is:
A. Methane
B. Propane
C. Ethane
D. Butane

Correct Answer: Option A


Explanation:
CNG (Compressed Natural Gas) is primarily methane (CH₄). LPG is propane and butane. Methane is the simplest hydrocarbon.

This question belongs to: Science chemistry
Question #2
Consider the following statements: 1. NPK fertilizers contain only macronutrients. 2. Zinc and Boron are micronutrients for plants. Which is/are correct?
A. Both 1 and 2
B. 1 only
C. Neither 1 nor 2
D. 2 only

Correct Answer: Option A


Explanation:
NPK fertilizers supply the three primary macronutrients: Nitrogen (N), Phosphorus (P), and Potassium (K). Plants also require trace elements (micronutrients) in very small amounts for proper growth, such as Iron, Manganese, Zinc, Copper, Boron, and Molybdenum. Both statements are factually correct.

This question belongs to: Science chemistry
Question #3
Faraday's first law: mass deposited ∝ quantity of electricity. The constant of proportionality (electrochemical equivalent) depends on:
A. Current
B. Temperature
C. Time
D. Nature of the substance

Correct Answer: Option D


Explanation:
Electrochemical equivalent (Z) is mass deposited per unit charge. It depends on molar mass and number of electrons transferred (valency). Z = M/(nF). It differs for different substances. Current and time affect total charge but not Z.

This question belongs to: Science chemistry