Physics MCQS

251. If Wood and Iron ball of the same size is falling in the same viscous fluid, than which ball will reach the ground first:
A. Wood Ball
B. Iron Ball
C. Both Reach Same time
D. None of these

252. Which one of the following is associated with the law of preservation of energy in liquids?
A. Archimedes’ principle
B. Bernoulli’s principle
C. Pascal’s Principle
D. Equation of continuity

253. When you blow some air above a paper strip, the paper rises. This is because:
A. The air above the paper moves faster and the pressure is higher
B. The air above the paper moves faster and the pressure is lower
C. The air above the paper moves slower and the pressure is higher
D. The air above the paper moves slower and the pressure is lower

254. In laminar flow adjacent layers of fluid:
A. Resist each other’s motion
B. Slide smoothly past each other
C. Mix in each other
D. None of the above

255. Which of the following isn’t a unit of tension:
A. Atmosphere
B. N/M
C. Pascal
D. MM of mercury

256. If flow rate in a pipe is “F” if we take another pipe of double length having the same cross-sectional area and maintain the same pressure difference at the two ends of the pipe, than flow rate will:
A. Increase
B. Decrease
C. Remains the same
D. None of these

257. As the speed of a moving fluid increases, the pressure in the fluid:
A. Increase
B. Remains constant
C. Decreases
D. May increase or decrease, depending on viscosity

258. Two rowboats moving parallel in the same direction will:
A. Remain moving in the same direction
B. Be pulled towards each other
C. Get apart due to an increase in pressure
D. None

259. The Maximum drag force on the falling circle is 9.8N, its weight is:
A. 1N
B. 9.8N
C. Cannot be calculated
D. 4.9N

260. Alternative current is converted to direct current by?
(A) Dynamo
(B) Motor
(C) Transformer
D) Rectifier