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Challenging Physics Quiz Part: II

The second installment of a beginner/intermediate physics quiz! 10 Questions.

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A ball with a mass of 2Kg is dropped from a height of 5m. What is the ball's kinetic energy as it reaches the ground? (Take g = 10m/s^2 )

  • 10J
  • 100J
  • 1J
  • 25J


A thin-walled hollow cylinder and a solid cylinder start from rest and roll down an inclined plane. Both cylinders start at the same height. Which cylinder reaches the bottom of the first?

  • The hollow cylinder
  • The solid cylinder
  • Both reach bottom at same time
  • What's a cylinder??


You place two identical containers A and B, filled with water into a freezer. The temperatures of the water in the containers are 90°C and 30°C respectively. Which container will cool down faster?

  • Both cool down at the same rate
  • Container B (30°C) cools faster
  • Container A (90°C) cools faster
  • Impossible to tell


Two identical cars collide head on. Each car is traveling at 100 km/h. The impact force on each car is the same as hitting a solid wall at:

  • 100 Km/h
  • 200 Km/h
  • 150 Km/h
  • 50 Km/h


In the absence of air resistance, a ball of mass 'm' is tossed upward to reach a height of 20m. At the 10m position, half way up, the net force on the ball is:

  • 2*m*g
  • m*g
  • (m*g)/2
  • (m*g)/4


When you drop a ball it accelerates downward at 9.8 m/s^2. If you instead throw it downward, then its acceleration immediately after leaving your hand, assuming no air resistance, is:

  • 9.8 m/s^2
  • More than 9.8 m/s^2
  • Less than 9.8 m/s^2
  • Cannot say, unless the speed of throw is given.


Which travels faster?

  • The speed of sound in water
  • The speed of sound in air
  • The speed of sound in a vacuum
  • The speed of sound in Iron


What type of lens is in a magnifying lens?

  • Fresnel lens
  • Biconcave
  • Concave
  • Convex


An airplane speeds up when wind blows from behind and loses speed when the wind is head on. When the wind is at a right angle to the plane, what happens to its speed relative to the ground below?

  • Increases
  • Decreases
  • No change
  • None of the above


The Moon is most responsible for Earth’s tides. Which pulls more strongly on the Earth and its oceans?

  • Moon
  • Sun
  • Both pull equally
  • None of the above