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PHYSICS MCQs

Total Questions : 3767 | Page 28 of 377 pages
Question 271. When a detergent is added to pure water, its surface tension
  1.    Increases
  2.    Decreases
  3.    Remains constant
  4.    Becomes infinite
 Discuss Question
Answer: Option B. -> Decreases
Question 272. What is unit of Viscosity ?
  1.    Coulomb
  2.    Newton second per square meter
  3.    Watt per meter per degree celcius
  4.    Joule per kilogram per Kelvin
 Discuss Question
Answer: Option B. -> Newton second per square meter
Question 273. Pieces of camphor placed on water move about rapidly. This is because of
  1.    Diffusion
  2.    Viscosity
  3.    Surface tension
  4.    Capillarity
 Discuss Question
Answer: Option C. -> Surface tension
Question 274. The hair of shaving brush clings together when removed from water due to
  1.    Surface tension
  2.    Viscosity
  3.    Elasticity
  4.    Friction
 Discuss Question
Answer: Option A. -> Surface tension
Question 275. A body falling through a liquid acquires a steady velocity is known as
  1.    End velocity
  2.    Touch down velocity
  3.    Terminal velocity
  4.    Steady state velocity
 Discuss Question
Answer: Option C. -> Terminal velocity
Question 276. Which one is not a part of Kepler's Law?
  1.    Law of orbits
  2.    Law of areas
  3.    Law of speed
  4.    Law of periods
 Discuss Question
Answer: Option C. -> Law of speed
Question 277. An aircraft can perform aerobatic manoeuvres in a vertical loop because of
  1.    Gravity
  2.    Centripetal force
  3.    Weight
  4.    Centrifugal force
 Discuss Question
Answer: Option A. -> Gravity
Question 278. The spoon dropped by an astronaut in a satellite will
  1.    Fall to the floor
  2.    Remain stationary
  3.    Continue to follow the motion of the satellite
  4.    Move tangentially away
 Discuss Question
Answer: Option C. -> Continue to follow the motion of the satellite
Question 279. Kepler's law of planetary motion states that the square of the time period is proportional to the
  1.    Semi-major axis
  2.    Square of the semi-major axis
  3.    Cube of the semi-major axis
  4.    Fourth power of the semi-major axis
 Discuss Question
Answer: Option C. -> Cube of the semi-major axis
Question 280. Lightning heats the surrounding air to
  1.    300 deg Cent
  2.    3000 deg Cent
  3.    30000 deg Cent
  4.    300000 deg Cent
 Discuss Question
Answer: Option C. -> 30000 deg Cent

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