General Science MCQs – pakistanjobsupdate.com

Question #186 Exam MCQ

Sound waves cannot travel through:

A A vacuum

B Water

C Air

D Solid steel

✔ Correct Answer: A. A vacuum

💡 Explanation: Sound is a mechanical wave that requires a medium (gas, liquid, solid) to propagate.

Question #187 Exam MCQ

What is the hardest known natural mineral on Earth?

A Diamond

B Corundum

C Quartz

D Topaz

✔ Correct Answer: A. Diamond

💡 Explanation: Diamond has a rating of 10 on the Mohs hardness scale, making it the hardest mineral.

Question #188 Exam MCQ

Which blood group is known as the 'Universal Donor'?

A O Negative (O-)

B AB Positive

C A Positive

D B Negative

✔ Correct Answer: A. O Negative (O-)

💡 Explanation: O-negative blood lacks A, B, and Rh antigens, making it safe for almost all recipients.

Question #189 Exam MCQ

Which unit is used to measure the frequency of a wave?

A Hertz (Hz)

B Joule

C Pascal

D Watt

✔ Correct Answer: A. Hertz (Hz)

💡 Explanation: Hertz (Hz) measures cycles per second.

Question #190 Exam MCQ

The process by which plants convert sunlight into chemical energy is called:

A Photosynthesis

B Respiration

C Transpiration

D Fermentation

✔ Correct Answer: A. Photosynthesis

💡 Explanation: Photosynthesis uses chlorophyll, sunlight, carbon dioxide, and water to produce glucose.

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