81. Which phenomenon demonstrates the particle nature of light?
✅ D. Photoelectric effect
A: Young's double-slit interference B: Diffraction grating C: Polarization D: Photoelectric effect Read more
Author: Sheeraz Ahmed – Page 5
82. What type of mirror is used as a rear-view mirror in vehicles to provide a wider field of view?
✅ B. Convex mirror
A: Plane mirror B: Convex mirror C: Concave mirror D: Parabolic mirror Read more
83. What is the acceleration due to gravity on the surface of Earth approximately?
✅ C. 9.8 m/s^2
A: 8.9 m/s^2 B: 10.5 m/s^2 C: 9.8 m/s^2 D: 11.2 m/s^2 Read more
84. Which law states that the pressure of a given mass of gas is inversely proportional to its volume at constant temperature?
✅ A. Boyle's law
A: Boyle's law B: Charles's law C: Gay-Lussac's law D: Avogadro's law Read more
85. What physical quantity is measured in Joules?
✅ D. Energy
A: Power B: Force C: Pressure D: Energy Read more
86. Through how many countries does the Amazon River flow or touch?
✅ C. Nine
A: Three B: Four C: Nine D: Seven Read more
87. What mountain range acts as a natural border between Europe and Asia?
✅ D. Ural Mountains
A: Alps B: Pyrenees C: Carpathian Mountains D: Ural Mountains Read more
88. Which European city is built on a collection of over 100 small islands in a lagoon?
✅ B. Venice
A: Amsterdam B: Venice C: Stockholm D: Copenhagen Read more
89. What is the deepest oceanic trench in the world?
✅ A. Mariana Trench
A: Mariana Trench B: Java Trench C: Puerto Rico Trench D: Sunda Trench Read more
90. Which African country has the largest population?
✅ D. Nigeria
A: Egypt B: South Africa C: Ethiopia D: Nigeria Read more