In a J tube partially filled with mercury the volume of an air column 4.2 ml and the mercury level in two limbs is same. Some mercury is now added to the tube so that the volume of the air is enclosed in shorter limb is now 2.8 ml.What is the difference in the levels of mercury in this situation (atm pressure=1bar.)
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Suppose the pressure at the surface of mercury in a barometer tube is P_1 and the pressure at the surface of mercury in the cup is P_2.
(a) P1= 0, P2 = atmospheric pressure EXPLANATION: Since there is nothing above the surface of the mercury in the tube the density above this surface =0, hence the pressure P₁ =0,...
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To construct a barometer, a tube of length 1 m is filled completely with mercury and is inverted in a mercury cup.
The correct answer is (d) < 76 cm. EXPLANATION: In this case, the space above the mercury is filled with air at atmospheric pressure initially. When the cork is removed, the atmospheric...
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Water and mercury are filled in two cylindrical vessels up to same height.
The correct answer is (a) v1 = v2 EXPLANATION: The velocity of the water v =√(2gh) which is independent of the density of the liquid.
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Water is flowing in streamliries motion through a tube with its axis horizontal. Consider two points A and B in the tube at the same horizontal level.
(c) The pressures are equal if the tube has a uniform cross-section. (d) The pressures may be equal even if the tube has a nonuniform cross-section. EXPLANATION: According to the Bernoulli's theorem if...
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A wave pulse, travelling on a two -piece string, gets partially reflected and partially transmitted at the junction.
The correct answer is (c) λ`< λ EXPLANATION: Since the reflected wave is inverted, the pulse is traveling from the lighter string to heavier string. Hence the speed of the incident...
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The lower end of a capillary tube is immersed in mercury. The level of mercury in the tube is found to be 2 cm below the outer level.
Rise/depression = 2S.cosθ/rρg For mercury -0.02 = 2S'.cosθ/rρ'g ------- (i) For water rise, h = 2S.cos0°/rρg ------- (ii) Dividing (ii) by (i) h/0.02 = -Sρ'/(S'*cosθ*ρ) →h = -0.02*Sρ'/(1000S'.cosθ) S' =7.5 x 10⁻² N/m. S =...
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Suppose the pressure at the surface of mercury in a barometer tube is P1 and the pressure at the surface of mercury in the cup is P2.
(a) P1= 0, P2 = atmospheric pressure EXPLANATION: Since there is nothing above the surface of the mercury in the tube the density above this surface =0, hence the pressure P₁ =0, and...
1 Answers 1 views
To construct a barometer, a tube of length 1m is filled completely with mercury and is inverted in a mercury cup.
The correct answer is (d) < 76 cm. EXPLANATION: In this case, the space above the mercury is filled with air at atmospheric pressure initially. When the cork is removed, the atmospheric...
1 Answers 1 views
Water and mercury are filled in two cylindrical vessels up to same height,
The correct answer is (a) v1 = v2 EXPLANATION: The velocity of the water v =√(2gh) which is independent of the density of the liquid.
1 Answers 1 views
An oil tanker partially filled with oil moves forward on a level road with uniform acceleration. The free surface of oil then:
(c) The surface of tanker will move in forward direction with increasing velocity (as acceleration in uniform), so depth will be larger at the rear end.
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