Physics Questions Answers

• 50. Atmospheric pressure is measured by

  1. Tonometer
  2. Pyrometer
  3. Barometer
  4. Thermometer

  Answer And Explanation

  Answer: Option C

  Explanation:

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• 51. Sudden fall in barometer is indication of

  1. Storm
  2. Rain
  3. Tide
  4. Clear weather

  Answer And Explanation

  Answer: Option A

  Explanation:

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• 52. Which is true
  

  1. In a static liquid at same horizontal level, pressure is more at centre
  2. In a static liquid at same horizontal level, pressure is less at centre.
  3. In a static liquid at same horizontal level, pressure is same at all points
  4. In a static liquid at same horizontal level, pressure is different at all points

  Answer And Explanation

  Answer: Option C

  Explanation:

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• 53. When a body is immersed partly or wholly in a liquid, there is an apparent loss in weight of the body which is equal to the weight of liquid displaced by the body.

  1. True
  2. False

  Answer And Explanation

  Answer: Option A

  Explanation:

  TRUE, it is Archimedes Principle.

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• 54. Force of attraction between the molecules of different substances is called

  1. Surface tension
  2. Cohensive force
  3. Adhesive force
  4. None of above

  Answer And Explanation

  Answer: Option C

  Explanation:

  Cohensive force - Force of attraction between the molecules of same substance is called Cohensive force.
  

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• 55. The force which opposes the relative motion between different layers of liquid or gases is called

  1. Critical Velocity
  2. Streamline Flow
  3. Terminal Velocity
  4. Viscous Force

  Answer And Explanation

  Answer: Option D

  Explanation:

  Critical Velocity - The maximum velocity upto which fluid motion is streamline is called Critical Velocity.
  
  Streamline Flow - If velocity of all fluid particles is same all the time then it can be said in streamline flow.
  
  Terminal Velocity - When a body falls in viscous medium, its velocity first increases and finally becomes constant. The constant velocity is called terminal velocity.

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• 56. What is the maximum value of deforming force upto which a material shows elastic property and above which the material loses it ?

  1. Elasticity
  2. Strain
  3. Elastic Limit
  4. Stress

  Answer And Explanation

  Answer: Option C

  Explanation:

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