India's first 3D printed rocket engine was developed by: MCQ with Answer and Explanation

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India's first 3D printed rocket engine was developed by:

A. Private startups

B. DRDO

C. ISRO

D. Both

Answer: Option D

Solution (By JKSSB Mock Tests)

ISRO and Indian startups have advanced 3D printing in rocketry.

This question belongs to: Static General Knowledge Science and Technology

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Question #1

Which of the following is the hardest natural substance on Earth?

A. Gold

B. Iron

C. Platinum

D. Diamond

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Correct Answer: Option D

Explanation:
Diamond is an allotrope of carbon and is the hardest known natural mineral.

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Question #2

What is the term for a computer program that mimics human conversation?

A. Chatbot

B. Search Engine

C. Database

D. Algorithm

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Correct Answer: Option A

Explanation:
A chatbot is an AI-powered software designed to simulate conversation with human users.

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Question #3

Who discovered the polio vaccine?

A. Alexander Fleming

B. Jonas Salk

C. Edward Jenner

D. Louis Pasteur

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Correct Answer: Option B

Explanation:
Jonas Salk developed the polio vaccine.

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