General Knowledge MCQs (page 9 of 61)
Famous people, inventions, sports, world records, currencies and well-known facts about Pakistan and the world.
1,204 questions. Select an option to check your answer, or open "Show answer". Showing 161–180.
- 161.
A mirage is caused by:
Show answer
Answer: B. Total internal reflection
Layers of hot air bend light so much that it reflects.
- 162.
The sky appears blue because of:
Show answer
Answer: C. Scattering of light
The air scatters short blue wavelengths more than other colours (Rayleigh scattering).
- 163.
Water has its maximum density at:
Show answer
Answer: D. 4 °C
This is why ice floats and lakes freeze from the top down.
- 164.
The speed of ships is measured in:
Show answer
Answer: A. Knots
One knot is one nautical mile per hour.
- 165.
A light-year is a unit of:
Show answer
Answer: D. Distance
It is the distance light travels in one year, about 9.46 trillion km.
- 166.
The speed of light in a vacuum is about:
Show answer
Answer: B. 3 × 10⁸ m/s
More exactly, it is 299,792,458 m/s.
- 167.
The SI unit of frequency is the:
Show answer
Answer: C. Hertz
One hertz is one cycle per second.
- 168.
The SI unit of pressure is the:
Show answer
Answer: D. Pascal
One pascal is one newton per square metre.
- 169.
The SI unit of electrical resistance is the:
Show answer
Answer: D. Ohm
It is named after Georg Ohm.
- 170.
The SI unit of power is the:
Show answer
Answer: A. Watt
One watt is one joule per second.
- 171.
The SI unit of force is the:
Show answer
Answer: A. Newton
One newton accelerates 1 kg at 1 m/s².
- 172.
The theory of relativity was put forward by:
Show answer
Answer: D. Albert Einstein
He published special relativity in 1905 and general relativity in 1915.
- 173.
The scientist who formulated the three laws of motion was:
Show answer
Answer: C. Isaac Newton
He published them in "Principia" in 1687.
- 174.
The "Father of Optics" is:
Show answer
Answer: C. Ibn al-Haytham
He wrote "Kitab al-Manazir" (Book of Optics).
- 175.
The "Father of Chemistry" in the Muslim world is:
Show answer
Answer: B. Jabir bin Hayyan
He was known as Geber in Europe.
- 176.
The "Father of Algebra" is generally considered to be:
Show answer
Answer: A. Al-Khwarizmi
The word "algebra" comes from his book "al-Jabr".
- 177.
The famous medical book "Al-Qanun fi al-Tibb" was written by:
Show answer
Answer: D. Ibn Sina
It was a standard medical textbook in Europe for centuries.
- 178.
The injectable polio vaccine was developed by:
Show answer
Answer: D. Jonas Salk
It was introduced in 1955. Sabin later developed the oral vaccine.
- 179.
The first vaccine, against smallpox, was developed by:
Show answer
Answer: B. Edward Jenner
He made it in 1796 from cowpox material.
- 180.
Penicillin was discovered by:
Show answer
Answer: A. Alexander Fleming
He discovered it in 1928. It was the first true antibiotic.