Who discovered the planet Pluto in 1930 at the Lowell Observatory? MCQ with Answer and Explanation

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Who discovered the planet Pluto in 1930 at the Lowell Observatory?

A. Clyde Tombaugh

B. Edwin Hubble

C. William Herschel

D. Percival Lowell

Answer: Option A

Solution (By JKSSB Mock Tests)

Clyde Tombaugh discovered Pluto by comparing photographic plates using a blink comparator instrument.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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Who discovered that the velocity of chemical reaction pathways balances linearly under specific concentration ratios, establishing the Law of Mass Action?

A. Jöns Jacob Berzelius

B. Cato Maximilian Guldberg and Peter Waage

C. Antoine Lavoisier

D. Robert Boyle

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Correct Answer: Option B

Explanation:
Norwegian scientists Guldberg and Waage formulated the mathematical chemical equilibrium rate laws in 1864.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who discovered the first recognized hormonal messenger molecule in the human body, Secretin?

A. Frederick Banting

B. William Bayliss and Ernest Starling

C. Karl Landsteiner

D. Charles Best

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Correct Answer: Option B

Explanation:
Bayliss and Starling isolated secretin in 1902, discovering chemical signaling loops that function independently of direct nervous inputs.

This question belongs to: Static General Knowledge Inventions and Discoveries