261. Which phenomenon demonstrates the particle nature of light?
✅ B. Photoelectric effect
A: Young's double-slit interference B: Photoelectric effect C: Diffraction grating D: Polarization Read more
Author: Sheeraz Ahmed – Page 14
262. What is the acceleration due to gravity on the surface of Earth approximately?
✅ A. 9.8 m/s^2
A: 9.8 m/s^2 B: 8.9 m/s^2 C: 10.5 m/s^2 D: 11.2 m/s^2 Read more
263. Which law states that the pressure of a given mass of gas is inversely proportional to its volume at constant temperature?
✅ C. Boyle's law
A: Charles's law B: Gay-Lussac's law C: Boyle's law D: Avogadro's law Read more
264. What type of mirror is used as a rear-view mirror in vehicles to provide a wider field of view?
✅ D. Convex mirror
A: Plane mirror B: Concave mirror C: Parabolic mirror D: Convex mirror Read more
265. What physical quantity is measured in Joules?
✅ B. Energy
A: Power B: Energy C: Force D: Pressure Read more
266. What mountain range acts as a natural border between Europe and Asia?
✅ B. Ural Mountains
A: Alps B: Ural Mountains C: Pyrenees D: Carpathian Mountains Read more
267. Through how many countries does the Amazon River flow or touch?
✅ A. Nine
A: Nine B: Three C: Four D: Seven Read more
268. What is the deepest oceanic trench in the world?
✅ C. Mariana Trench
A: Java Trench B: Puerto Rico Trench C: Mariana Trench D: Sunda Trench Read more
269. Which European city is built on a collection of over 100 small islands in a lagoon?
✅ D. Venice
A: Amsterdam B: Stockholm C: Copenhagen D: Venice Read more
270. Which African country has the largest population?
✅ B. Nigeria
A: Egypt B: Nigeria C: South Africa D: Ethiopia Read more