Who discovered that regular arrays of atoms act as diffraction gratings for X-rays, establishing X-ray crystallography? MCQ with Answer and Explanation

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Who discovered that regular arrays of atoms act as diffraction gratings for X-rays, establishing X-ray crystallography?

A. Wilhelm Röntgen

B. William Henry Bragg

C. Rosalind Franklin

D. Max von Laue

Answer: Option D

Solution (By JKSSB Mock Tests)

Max von Laue discovered X-ray diffraction by crystals in 1912, proving the wave nature of X-rays and structural lattice layouts.

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Who discovered that the chemical element Iodine is isolated from seaweed ash matrices?

A. Antoine Lavoisier

B. Humphry Davy

C. Bernard Courtois

D. Joseph Louis Gay-Lussac

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Correct Answer: Option C

Explanation:
Bernard Courtois isolated violet iodine vapors accidentally in 1811 while adding excess sulfuric acid to seaweed extract solutions.

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Question #2

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The first electronic programmable digital computer, ENIAC, was designed by whom?

A. John Mauchly and J. Presper Eckert

B. Charles Babbage

C. John von Neumann

D. Alan Turing

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Correct Answer: Option A

Explanation:
ENIAC (Electronic Numerical Integrator and Computer) was constructed by Mauchly and Eckert at the University of Pennsylvania in 1945.

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Question #3

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The invention of the modern mechanical reaper, which automated grain harvesting, was patented by whom?

A. John Deere

B. James Hargreaves

C. Cyrus McCormick

D. Eli Whitney

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Correct Answer: Option C

Explanation:
Cyrus McCormick patented the horse-drawn mechanical reaper in 1834, transforming agricultural output.

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