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PHYSICS MCQs

Total Questions : 3767 | Page 25 of 377 pages
Question 241. Which of these liquids has the highest viscosity?
  1.    Milk
  2.    Syrup
  3.    Pineapple juice
  4.    Water
 Discuss Question
Answer: Option B. -> Syrup
Question 242. The absorption of ink by blotting paper involves
  1.    Viscosity of ink
  2.    Diffusion of ink through the blotting
  3.    Capillary action phenomenon
  4.    Siphon action
 Discuss Question
Answer: Option C. -> Capillary action phenomenon
Question 243. Water from soil enters into the root hairs owing to :
  1.    Atmospheric pressure
  2.    Capillary pressure
  3.    Root pressure
  4.    Osmotic pressure
 Discuss Question
Answer: Option B. -> Capillary pressure
Question 244. Which of the following liquids has the least density ?
  1.    Fresh water
  2.    Salt water
  3.    Petrol
  4.    Mercury
 Discuss Question
Answer: Option C. -> Petrol
Question 245. A small drop of oil spreads over water because :
  1.    Oil has a higher surface tension
  2.    Water has a higher surface tension
  3.    Oil has a higher viscosity
  4.    Water has a higher viscosity
 Discuss Question
Answer: Option B. -> Water has a higher surface tension
Question 246. Two rods, one of copper and other of steel, experience the same upthrust when placed in water.Thus, both have
  1.    Equal volume
  2.    Equal weight
  3.    Equal density
  4.    Equal mass
 Discuss Question
Answer: Option A. -> Equal volume
Question 247. On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
  1.    Mercury is a metal
  2.    Density of mercury is greater than that of water
  3.    Cohesion of mercury is greater than its adhesion with glass
  4.    Cohesion of water is greater than its adhesion with glass
 Discuss Question
Answer: Option C. -> Cohesion of mercury is greater than its adhesion with glass
Question 248. If ice floating on water in a vessel melts, the water level in the vessel ________ .
  1.    Increases
  2.    Does not change
  3.    First increases before decreasing
  4.    Decreases
 Discuss Question
Answer: Option B. -> Does not change
Question 249. The velocity of falling rain drops attains a terminal value because of
  1.    Surface tension
  2.    Air current
  3.    Upward thrust due to air
  4.    Viscous force exerted by air
 Discuss Question
Answer: Option D. -> Viscous force exerted by air
Question 250. Which one is the unit of surface tension of a liquid
  1.    Newton /m2
  2.    Electron volt /cm2
  3.    Joule/ mm
  4.    None of the above
 Discuss Question
Answer: Option B. -> Electron volt /cm2

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