Who invented the standard mechanical marine propeller that replaced paddle wheels on ships? MCQ with Answer and Explanation

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Who invented the standard mechanical marine propeller that replaced paddle wheels on ships?

A. John Ericsson and Francis Pettit Smith

B. James Watt

C. Robert Fulton

D. Charles Parsons

Answer: Option A

Solution (By JKSSB Mock Tests)

Ericsson and Smith independently patented efficient screw propeller designs in 1836, enabling faster transoceanic transport.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who invented the first operational hot air balloon, executing the first recorded human flight?

A. Count Ferdinand von Zeppelin

B. Montgolfier Brothers

C. Wright Brothers

D. Otto Lilienthal

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Correct Answer: Option B

Explanation:
Joseph-Michel and Jacques-Étienne Montgolfier developed and demonstrated the hot air balloon in France in 1783.

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Question #2

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Who discovered the protozoan parasite causing Malaria in human red blood cells?

A. Louis Pasteur

B. Robert Koch

C. Charles Alphonse Laveran

D. Ronald Ross

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Correct Answer: Option C

Explanation:
Charles Alphonse Laveran discovered the malaria parasite in 1880, winning the Nobel Prize in 1907. Sir Ronald Ross later discovered that mosquitoes transmit it.

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Question #3

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The invention of the high-strength industrial tool steel alloy known as tungsten steel was pioneered by whom?

A. Henry Bessemer

B. Robert Forester Mushet

C. James Watt

D. Andrew Carnegie

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Correct Answer: Option B

Explanation:
Mushet patented self-hardening tungsten tool steel in 1868, allowing factory metal lathe tools to retain sharpness at high cutting speeds.

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