Which element has atomic number 8? MCQ with Answer and Explanation

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Which element has atomic number 8?

A. Nitrogen

B. Fluorine

C. Oxygen

D. Carbon

Answer: Option C

Solution (By JKSSB Mock Tests)

Oxygen has atomic number 8.

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Question #1

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Which vaccine uses mRNA technology?

A. Pfizer COVID-19 vaccine

B. Covishield

C. Covaxin

D. BCG

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Correct Answer: Option A

Explanation:
Pfizer and Moderna COVID vaccines use mRNA technology.

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Question #2

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Which of these describes '3D Printing'?

A. Additive manufacturing process to build 3D objects

B. Creating holograms with light

C. Printing high-quality photos on paper

D. Designing complex blueprints on computers

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Correct Answer: Option A

Explanation:
3D printing is an additive manufacturing process that layers material to build a three-dimensional object.

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Question #3

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India's National Mission on Quantum Technologies is known as:

A. Quantum India

B. Both A and C

C. QuEST

D. National Quantum Mission

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Correct Answer: Option B

Explanation:
India has initiatives like National Quantum Mission and QuEST.

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