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PHYSICS MCQs

Total Questions : 3767 | Page 64 of 377 pages
Question 631. The pressure of a fluid varies with depth h as P = PQ+pgh, where p is the fluid density. This expression is associated with
  1.    Pascal's law
  2.    Newton's law
  3.    Bernoulli's principle
  4.    Archimedes' principle
 Discuss Question
Answer: Option A. -> Pascal's law
Question 632. A parachute descends slowly whereas a stone dropped from the same height falls rapidly, because
  1.    Stone is heavier than parachute
  2.    Special mechanisms are present in parachute
  3.    A parachute has a larger surface area and air resistance is more
  4.    None of these
 Discuss Question
Answer: Option C. -> A parachute has a larger surface area and air resistance is more
Question 633. Why does bleeding occur through the nose in high mountainous regions ?
  1.    The pressure of blood in capillaries is greater than the outside pressure
  2.    The pressure at high altitudes is greater than that on the plains
  3.    The blood pressure of a person increases at high altitudes
  4.    The blood pressure fluctuates and finally decreases drastically
 Discuss Question
Answer: Option C. -> The blood pressure of a person increases at high altitudes
Question 634. Which of the following instruments is used to measure humidity ?
  1.    Kata Thermometer
  2.    Anemometer
  3.    Sling Psychrometer
  4.    Clinical Thermometer
 Discuss Question
Answer: Option C. -> Sling Psychrometer
Question 635. Anemometer is an instrument meant for measuring ________
  1.    Velocity
  2.    Air masses
  3.    Wind speed
  4.    Temperature
 Discuss Question
Answer: Option C. -> Wind speed
Question 636. A fountain pen works on the principle of
  1.    Flow of liquids from higher to lower potential
  2.    Capillary action
  3.    Bernoulli's principle
  4.    Viscosity of liquids
 Discuss Question
Answer: Option B. -> Capillary action
Question 637. A barometer is kept inside a bell jar. Air is slowly pumped out of the jar.
  1.    The mercury level starts rising
  2.    The mercury level starts falling
  3.    The mercury level does not change
  4.    The bell jar breaks up
 Discuss Question
Answer: Option A. -> The mercury level starts rising
Question 638. Air pressure is measured in which of the following units?
  1.    Steridian
  2.    Kg/mts
  3.    Newton
  4.    Pascal
 Discuss Question
Answer: Option D. -> Pascal
Question 639. The temperature at which water boils depends mainly on
  1.    Air Pressure
  2.    Specific heat
  3.    Density
  4.    Relative humidity
 Discuss Question
Answer: Option A. -> Air Pressure
Question 640. Hydraulic machines work under the Principle of :
  1.    Newton's Law
  2.    Joules Law
  3.    Pascal's Law
  4.    Floatation Law
 Discuss Question
Answer: Option C. -> Pascal's Law

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