Related InterviewSolutions

• A 20 cm long capillary tube is dipped in water. The water rises up to 8 cm. If the entire arrangement is put in a freely falling elevator, the length of water column in the capillary tube will beA. `20cm`B. `4cm`C. `10cm`D. `8cm`
• The end of a capillary tube with a radius `r` is immersed in water. Is mechanical energy conserved when the water rises in the tube? The tube is suficiently long. If not calculate the energy change.
• The lower end of a capillary tube is at a depth of `12 cm` and water rises `3 cm` in it. The mouth pressure required to blow an air bubble at the lower end will be `x cm` of water column, where `x` isA. `12`B. `15`C. `3`D. `9`
• A hollow sphere has a small hole in it. On lowering the sphere in a tank of water, it is observed that water enters into the hollow sphere at a depth of `40 cm` below the surface. Surface tension of water is `7 xx 10^(-2) N//m`. The diameter of the hole isA. `1/28mm`B. `1/21mm`C. `1/14mm`D. `1/7mm`
• Spherical particles of pollen are shaken up in water and allowed to settle. The depth of water is `2xx10^(-2)m`. What is the diameter of the largest particles remaining in suspension one hour later? Density of pollen `=1.8xx10^(3)kgm^(-3)` viscosity of water `=1xx10^(-2)` poise and density of water `=1xx10^(-5)kgm^(-3)`
• Statement I: Dust particles generally settle down in a closed room.Statement II: The terminal velocity is inversely proportional to the square of their radii.A. Statement I is true, statement II is true and Statement II is a correct explanation for Statement I.B. Statement I is true, Statement II is true and Statement II is NOT the correct explanation for Statement I.C. Statement I is true, Statement II is false.D. Statement I is false, Statement II is true.
• A barometer contains two uniform capillaries of radii `1.4xx10^(-3)m` and `7.2xx10^(-4)m`. If the height of liquid in narrow tube is `0.2m` more than that in wide tube, calculate the true pressure difference. Density of liqid `=10^(3)kg//m^(3)`, surface tension `=72xx10^(-3)N//m` and `g=9.8ms^(-12)`.
• Between a plate of area `100 cm^(2)` and another plate of area `100 m^(2)` there is a `1 mm`, thick layer of water, if the coefficient of viscosity of water is `0.01` poise, then the force required to move the smaller plate with a velocity `10 cms^(-1)` with reference to large plate isA. `100 dyn`B. `10^(4)dyn`C. `10^(6) dyn`D. `10^(9)dyn`
• A plate of area `100 cm^(2)` is placed on the upper surface of castor oil, `2mm` thick. Taking the coefficient of viscosity to be `15.5` poise, calculate the horizontal force neccesary to move the plate with a velocity `3cm^(-1)`.
• In the figure shown, forces of equal magnitude are applied to the two ends of a uniform rod. Consider `A` as the cross-sectional area of the rod. For this situation, mark out the incorrect statements. A. The rod is in compressive stress.B. The numerical value of stress developed in the rod is equal to `F//A`.C. The stress is defined as internal force developed at any cross section per unit area.D. none of these