General Science MCQs – pakistanjobsupdate.com

Question #176 Exam MCQ

What is the chemical symbol for Gold?

A Au

B Ag

C Fe

D Pb

✔ Correct Answer: A. Au

💡 Explanation: Au comes from the Latin word 'Aurum', meaning shining dawn.

Question #177 Exam MCQ

Which gas is most abundant in the Earth's atmosphere?

A Nitrogen (approx. 78%)

B Oxygen

C Carbon Dioxide

D Argon

✔ Correct Answer: A. Nitrogen (approx. 78%)

💡 Explanation: Nitrogen makes up roughly 78.08% of dry air in the Earth's atmosphere.

Question #178 Exam MCQ

The powerhouse of the cell is known as:

A Mitochondria

B Nucleus

C Ribosome

D Endoplasmic Reticulum

✔ Correct Answer: A. Mitochondria

💡 Explanation: Mitochondria generate most of the chemical energy needed by the cell (ATP).

Question #179 Exam MCQ

What is the speed of light in vacuum approximately?

A 300,000 km/s

B 150,000 km/s

C 3,000 km/s

D 30,000 km/s

✔ Correct Answer: A. 300,000 km/s

💡 Explanation: The speed of light in vacuum is approximately 299,792 kilometers per second.

Question #180 Exam MCQ

Deficiency of Vitamin C leads to which disease?

A Scurvy

B Rickets

C Beriberi

D Night Blindness

✔ Correct Answer: A. Scurvy

💡 Explanation: Lack of Vitamin C in the diet causes scurvy, resulting in bleeding gums and weakness.

Question #181 Exam MCQ

Which planet in our solar system is known as the 'Red Planet'?

A Mars

B Venus

C Jupiter

D Mercury

✔ Correct Answer: A. Mars

💡 Explanation: Mars appears red due to iron oxide (rust) on its surface.

Question #182 Exam MCQ

What is the pH value of pure water at 25°C?

A 7 (Neutral)

B 5 (Acidic)

C 9 (Basic)

D 0

✔ Correct Answer: A. 7 (Neutral)

💡 Explanation: Pure water has a neutral pH of exactly 7 at room temperature.

Question #183 Exam MCQ

Which instrument is used to measure atmospheric pressure?

A Barometer

B Thermometer

C Hygrometer

D Anemometer

✔ Correct Answer: A. Barometer

💡 Explanation: A barometer measures atmospheric pressure to forecast weather changes.

Question #184 Exam MCQ

What type of lens is used to correct Myopia (Short-sightedness)?

A Concave Lens

B Convex Lens

C Bifocal Lens

D Cylindrical Lens

✔ Correct Answer: A. Concave Lens

💡 Explanation: A diverging concave lens is used to correct myopia by focusing images onto the retina.

Question #185 Exam MCQ

Which organ in the human body produces insulin?

A Pancreas

B Liver

C Kidney

D Gallbladder

✔ Correct Answer: A. Pancreas

💡 Explanation: The beta cells of the Islets of Langerhans in the pancreas secrete insulin.

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