Buoyancy MCQ

Test your knowledge with important Buoyancy MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Buoyancy MCQs at Bissoy

• Assertion: A needle placed carefully on the surface of the water may float, whereas a ball of the same material will always sink. Reason: The buoyancy of an object depends both on the material and shape of the object
  ক

  Both assertion and reason are true and the reason is the correct explanation of the assertion

  খ

  Both assertion and reason are true but the reason is not the correct explanation of the assertion

  গ

  Assertion is true but the reason is false

  ঘ

  Assertion and reason is false
• The water droplets in free fall are spherical due to ___________
  ক

  Gravity

  খ

  Viscosity

  গ

  Surface tension

  ঘ

  Intermolecular attraction
• A wooden block is taken to the bottom of a deep, calm lake of water and then released. It rises up with a ___________
  ক

  Constant acceleration

  খ

  Decreasing acceleration

  গ

  Constant velocity

  ঘ

  Decreasing velocity
• Spherical balls of radius R are falling in a viscous fluid of viscosity Ƞ with a velocity v. The retarding viscous force acting on the spherical ball is ___________
  ক

  Directly proportional to R but inversely proportional to v

  খ

  Directly proportional to both radius R and velocity v

  গ

  Inversely proportional to both radius R and velocity v

  ঘ

  Inversely proportional to R but directly proportional to velocity v
• It is difficult to cook food at the mountain.
  ক

  True

  খ

  False
• A boat having a length of 3m and breadth 2m is floating on a lake. The boat sinks by one cm when a man gets on it. What is the mass of the man?
  ক

  6kg

  খ

  60kg

  গ

  16kg

  ঘ

  600kg
• A solid weight 6kg in air. If its density is 2000kgm-3, what will be its apparent weight in water?
  ক

  6kg

  খ

  2kg

  গ

  3kg

  ঘ

  5kg
• A cube of wood floating in water supports a 200g mass at the centre of its top face. When the mass is removed, the mass rises by 2cm. Determine the volume of cube.
  ক

  1000cm3

  খ

  100cm3

  গ

  10cm3

  ঘ

  1cm3
• Assertion: A hydrogen filled balloon stops using after it has attained a certain height in the sky. Reason: The atmospheric pressure decreases with height and becomes zero when maximum height is attained.
  ক

  Both assertion and reason are true and the reason is the correct explanation of the assertion

  খ

  Both assertion and reason are true but the reason is not the correct explanation of the assertion

  গ

  Assertion is true but the reason is false

  ঘ

  Assertion and reason is false
• When the temperature is increased, the angle of contact of a liquid?
  ক

  Increase

  খ

  Decrease

  গ

  Remains the same

  ঘ

  First increases and then decreases
• In incompressible fluid flows steadily through a cylindrical pipe which had a radius 2R at point A and R at a point B further along the flow direction. If the velocity at A is v, then that at B is?
  ক

  v/2

  খ

  v

  গ

  2v

  ঘ

  4v